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<title cf:type="text"><![CDATA[Editorial department of the Journal of National University of Defense Technology -->机械工程·控制科学与工程]]></title>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Axiomatic design for purely hydraulic drive in-pipe robot]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201906010]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[As the applications and the demands of in-pipe robot are increasing, the problems in robot such as the coupling of output functions, the low positioning accuracy and the low reliability in complex environment, are becoming more and more serious. The axiomatic design theory was applied to the design of in-pipe robot, and a purely hydraulic drive in-pipe robot based on the flexible support structure was presented, which can meet the special needs in the horizontal well. The principle and process of axiomatic design were summarized, and the robot concept design was carried out to complete the design coupling analysis. The concrete composition of mechanical system and hydraulic system of robot were designed and its working mechanism was analyzed. Based on AMESim, the motion principle of the robot was simulated and analyzed, and the results show that the robot can achieve automatic reciprocating motion, the traction force can reach 30 kN, and the motion speed can reach 0.12 m/s. Moreover, the traction capacity and the motion speed of the robot can be adjusted separately, which means the decoupling design is realized.]]></description>
<pubDate>2019/12/9 16:59:48</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[FANG Delei, SHANG Jianzhong, LUO Zirong, YANG Junhong and WU Wei]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>FANG Delei, SHANG Jianzhong, LUO Zirong, YANG Junhong and WU Wei</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201906010]]></guid><cfi:id>32</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Multi-objective coordinated attitude control method for dual layer air spring vibration isolation mounting]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201906011]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[A multi-objective coordinated attitude control method was studied, which is aimed at the high precision attitude control of the dual layer air spring vibration isolation mounting. After establishing the dynamics model of dual layer air spring vibration isolation mounting and the equivalent model of charge and discharge control, the control response characteristic model was established. Then the multi-objective coordinated attitude control model was brought out based on the multi-objective satisfactory optimization method. This control method can adapt to the attitude control coupling of the superstratum and the substratum air spring vibration isolation mounting. And it can also restrain the elasticity distortion influence on the attitude equilibrium control. This control method was verified on a dual layer air spring vibration isolation mounting experimental system. It can be used in a dual air spring vibration isolation mounting for some large ship generator set and can realize the high vibration isolation efficiency.]]></description>
<pubDate>2019/12/9 0:00:00</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[BU Wenjun, SHI Liang, HE Lin and XU Wei]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>BU Wenjun, SHI Liang, HE Lin and XU Wei</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201906011]]></guid><cfi:id>31</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Acoustic characteristic of drum-like silencer with flexible back cavity]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201906012]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The existed drum-like silencer usually consists of expansion chamber with RBC (rigid back cavity) and tensioned membrane. With the effect of vibration radiation of the membrane, the transmitted acoustic energy can be reduced. In order to enable the silencer with ability of vibration isolation, a new type of silencer with FBC (flexible back cavity) was presented. The acoustic theoretical model was established using Fourier-Galerkin method. Then, the TL (transmission loss) characteristic was compared with the RBC model. Further, the silencing mechanism of the FBC silencer was studied, and the influence of the FBC parameters on the performance was also analyzed. Results indicate that the proposed FBC silencer has a better performance in low frequency. Compared with the RBC silencer having the same structural size, it can greatly improve the acoustic absorption band can be improved.]]></description>
<pubDate>2019/12/9 16:59:49</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[HOU Jiuxiao, ZHU Haichao, MAO Rongfu and YUAN Suwei]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>HOU Jiuxiao, ZHU Haichao, MAO Rongfu and YUAN Suwei</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201906012]]></guid><cfi:id>30</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Testability allocation method based on inverse tangent function]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201906013]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The existing testability allocation methods exist some unreasonable problems, such as the allocation index is too low or too high. The reason is that those methods apply linear allocation function which is not consistent with testability index. Therefore, a novel allocation function based on inverse tangent function was constructed, and the allocation algorithm of fault detection rate and fault isolation rate was presented. The comparative analysis among the proposed method and the classic fault rate allocation and comprehensive weighted allocation methods shows the superiority of the method proposed. With the increase of the allocation weight (fault rate), the amplification of allocation index gradually decreases, and there will be no unreasonable allocation index which is either too low or higher than 1.]]></description>
<pubDate>2019/12/9 16:59:49</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[YANG Peng, HU Yerong, WU Weixing and QIU Jing]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>YANG Peng, HU Yerong, WU Weixing and QIU Jing</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201906013]]></guid><cfi:id>29</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Optimized composition method of the ships noise-control techniques]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201906014]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[For the noise control of the ships, due to the rigid limit of the general conditions and the acoustical abnormity, the traditional acoustical design method of the new ships cannot be used directly. For the noise control of the in-service ships, the optimized integrating method of the techniques was proposed. Based on the tactical requirement, the top noise-control targets were designed, and the targets with four criteria were validated. Combining the noise data of the refit test and the existing techniques, the primary composition project of the noise-control techniques was established. With the acoustical evaluation and optimizing, the optimized distributive system of the targets and the final composition project of the noise-control techniques were obtained. The method was validated with a model experiment. The results showed that the method can achieve an optimized composition of the noise-control techniques in the refit of the in-service ships.]]></description>
<pubDate>2019/12/9 16:59:49</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[CHENG Guo, HE Lin, WANG Yingchun and CUI Lilin]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>CHENG Guo, HE Lin, WANG Yingchun and CUI Lilin</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201906014]]></guid><cfi:id>28</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Misalignment analysis of pumps-motor aggregate with plum-shaped flexible couplings]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201906015]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Pumps-motor aggregate is the power unit of the ship ruder system, which requires high reliability and quietness. Misalignment of the pumps-motor aggregate induces abrasion of bearing and impact between stator and rotor, result in instability and characteristic line spectrum. Plum-shaped flexible couplings possess many advantages such as simple in structure, high compensatory ability and good damping capacity, which have been widely used in ship ruder system. Establishing parallel misalignment model and angular deviation misalignment model of plum-shaped flexible coupling, and analyzing vibrating characteristic of pumps-motor aggregate provide theoretical analysis and test data on misalignment status diagnose of pumps-motor aggregate.]]></description>
<pubDate>2019/12/9 16:59:49</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[XUAN Yuan, HE Lin and LIAO Jian]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>XUAN Yuan, HE Lin and LIAO Jian</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201906015]]></guid><cfi:id>27</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Space terminal guidance law based on adaptive radial basis function with terminal angle constraints and autopilot characteristic]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201906016]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to make the naval gun satisfy the terminal angular constraint while striking near shore maneuver target in terminal guidance section, a space terminal guidance law based on the adaptive RBF(radial basis function) approximation network and dynamic surface was proposed, which takes the dynamic characteristics of autopilot in consideration. The space relative motion model was constructed, and the extended state observer with modified tracking differentiator was used to estimate the acceleration of target. Aiming at zeroing the tracking error about line of sight angle and angular velocity, the nonsingular terminal sliding mode was designed with adopting adaptive exponential reaching law. The adaptive RBF approximation network was applied to weaken control instruction chattering. The tracking error about line of sight angle and angular velocity in system is uniformly bounded, which was proved by Lyapunov second method. Simulation experiment shows this terminal guidance law makes the guided projectile possess well terminal guidance performance while striking targets with different maneuver forms in space.]]></description>
<pubDate>2019/12/9 16:59:49</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[JIANG Shang, TIAN Fuqing, SUN Shiyan and LIANG Weige]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>JIANG Shang, TIAN Fuqing, SUN Shiyan and LIANG Weige</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201906016]]></guid><cfi:id>26</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Ship′s shaft-related electric field mechanism of production and countermeasure technology]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201906017]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to reduce the vessel′s shaft-related electric field, the equivalent circuit of shaft-related electric field was established on the basis of the analysis of the ship aft end structure, and it proved that the fluctuating resistance between the carbon brush and slip ring is the main factor that produces shaft-related electric field. The principle of the ASG (active shaft grounding) system was studied, and the prototype ASG system was developed and tested by shrinkage ratio ship model and real vessel experiments. The results showed that the shaft-rate electric field can be reduced effectively by 90% when the ASG system is employed. In addition, the ASG system will make static electric field increase when the resistance between the carbon brush and slip ring counts much in the equivalent circuit. After analyzing the factors that affect the output current of ASG system, it was found that the maximal output current is firmly related with the cathodic protection state, but not the sailing speed.]]></description>
<pubDate>2019/12/9 16:59:49</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[JIANG Runxiang, ZHANG Jiawei and CHEN Xingang]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>JIANG Runxiang, ZHANG Jiawei and CHEN Xingang</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201906017]]></guid><cfi:id>25</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Modeling of ship corrosion electric field and verification of optimal compensation solution]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201906018]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Based on the equivalent dipole method, the analytical formula of compensation dipole field was given from the length, the angle and the size of compensated dipole. The electric field model of “corrosion dipole + compensation dipole” was established by using the principle of charge vector superposition. The simulation was taken to verify the validity of the “corrosion dipole + compensation dipole” electric field model, then to verify the influence of the compensate dipole on the ship′s electric field, finally the optimal solution was obtained. The test results show that compensation effect is the best when the compensation anode is farthest away from the terminal of compensation system, and the compensation system is parallel to the horizontal plane; as well as the original ship corrosion electric field can be offset theoretically under the compensation optimal condition.]]></description>
<pubDate>2019/12/9 16:59:49</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[HE Fang, WANG Xiangjun and ZHANG Jianchun]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>HE Fang, WANG Xiangjun and ZHANG Jianchun</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201906018]]></guid><cfi:id>24</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Application of improved genetic algorithm in microphone array optimization]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201906019]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Due to its periodic structure, the regular planar array has problems, such as wide beamwidth, high global side lobe in beam synthesis. So, an array optimization method based on the improved genetic algorithm was proposed. A planar grid microphone array was designed to satisfy the requirement of element spacing. An objective function with the main lobe width as the constraint and the global side lobe level as the fitness was constructed. The strategy of free intersection among individuals and random element number forced mutation was adopted to increase the searching range of the population on the basis of conventional genetic algorithms. A number of optimized arrays were obtained through simulation. Compared with several regular planar arrays, the random arrays optimized by the improved genetic algorithm have better performance under different signal-to-noise ratio inputs; compared with several conventional optimization algorithms, the improved genetic algorithm has stronger search ability, the number of random arrays is more, and the performance is better, which proves the feasibility of the proposed method.]]></description>
<pubDate>2019/12/9 16:59:49</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[CAO Menghua, LI Long and XIE Hongwei]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>CAO Menghua, LI Long and XIE Hongwei</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201906019]]></guid><cfi:id>23</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Distributed wireless coverage detection algorithm based on multiple optimization]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202002017]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to meet the real-time field and repeatable detection requirements for the signal coverage effectiveness of wireless communication network, a distributed wireless coverage detection algorithm based on wireless sensor network was proposed. The received signal strength of the wireless communication network was perceived and preprocessed by wireless sensor nodes randomly deployed in the target area. The variogram was used to construct a new BP(back propagation) neural network objective function, and the initial weight and threshold were optimized by the modified particle swarm algorithm. The trained network model was used to estimate the interpolation of the target area with detection blind zone, and the data collected by the sensor nodes were combined to generate the equal signal strength line of the wireless communication network. The simulation results show that the proposed algorithm has higher prediction accuracy than other classical algorithms, and can effectively detect the signal coverage situation of the wireless communication network in the target area.]]></description>
<pubDate>2020/4/29 11:02:03</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[WANG Hongjun, XIANG Tingli, PAN Jifei]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>WANG Hongjun, XIANG Tingli, PAN Jifei</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202002017]]></guid><cfi:id>22</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Moving target detection method of reverberation background based on high-order statistics]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202002018]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Considering the moving target detection in reverberation background, the high-order statistics obtained by the output of received data after beamforming and matched filtering were regarded as statistical observation space. Based on the high-order statistical characteristic difference of reverberation and target echoes, the high-order statistics can be used to build characteristic vectors by multiple ping output. The Mahalanobis distance between characteristic vectors of the target and reverberation was used as the quantified standard to measure difference between the target and reverberation. The threshold was based on the maximal constant conditional power test. ROC(receiver operating characteristic) curves were obtained under different signal-reverberation ratio conditions by Monte Carlo simulations. Simulations and sea trial results show that the new method achieves higher performance than traditional detection using single ping.The output signal-reverberation ratio, which ensures the false alarm lower than 0.01 and the detection probability higher than 0.5, is reduced to 3 dB, approximately 6 dB less than that of the traditional method.]]></description>
<pubDate>2020/4/29 11:02:03</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[WANG Xiaotong, CAI Zhiming]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>WANG Xiaotong, CAI Zhiming</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202002018]]></guid><cfi:id>21</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Fault diagnosis models and evolution method based on a unified theory framework]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202002019]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[A unified diagnosis model based on probabilistic graphical theory was studied. The model constructing method and its variations in different scenarios were discussed. Complex problems such as fault diagnosis in multimode systems, diagnosis with coupling faults, dynamic faults and fault prognosis were solved by using the framework. In order to combine the advantages of the model-based method and the data-driven method, a model learning algorithm was proposed, by means of which the diagnostic result was improved. In the end, the possible model developing directions and research focus were discussed, which can provide a reference for the follow-up theory research.]]></description>
<pubDate>2020/4/29 11:02:04</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[ZHANG Shigang, LUO Xu, LUO Yanting, YANG Yongmin]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZHANG Shigang, LUO Xu, LUO Yanting, YANG Yongmin</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202002019]]></guid><cfi:id>20</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Modal analysis and multi-objective optimization of the naval gun barrel]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202002020]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The muzzle disturbance is an important factor of affecting the naval gun firing′s accuracy. In order to reduce the muzzle disturbance and optimize the barrel structure, the ABAQUS finite element model of flexible barrel was established, and the modal calculation results of the model were compared with the modal test values, which proves that the established flexible finite element model is effective. A method of new quantum chaos particle swarm optimization algorithm and dynamic joint optimization was proposed to carry out multi-objective optimization of the artillery recoil mechanism. Optimization results indicate that the line speed, angular velocity and angular displacement of optimized muzzle center are significantly reduced when compared with that before optimization, the barrel mass is reduced, and the structure is more reasonable. This indicates that the optimization method is effective and feasible, and can provide reference for the overall design of the whole naval gun.]]></description>
<pubDate>2020/4/29 11:02:04</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[LIU Guoqiang, CHEN Weiyi, CHEN Huadong, CHENG Han]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>LIU Guoqiang, CHEN Weiyi, CHEN Huadong, CHENG Han</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202002020]]></guid><cfi:id>19</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Level synthesis strategy for 4-level class-S digital power amplifier]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202002021]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The DSM (Delta-Sigma modulator) can get a better performance by increasing the quantizer′s levels. But the multi-bit DSM output cannot drive the SMPA (switch-mode power amplifiers) directly due to the multi-levels of DSM output in the class-S DPA (digital power amplifier). So the multi-level SMPA with multiple SMPA cells is needed. Several level synthesis strategies for 4-level class-S DPA based on 2 bit DSM were proposed and analyzed. The theory and simulation results show that, with an appropriate level synthesis scheme, the 4-level class-S DPA obtains a much better performance. Especially, the effect of level synthesis strategy is more remarkable in power back-off condition.]]></description>
<pubDate>2020/4/29 11:02:04</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[ZHOU Qiang, ZHU Lei, CHEN Jianbin]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZHOU Qiang, ZHU Lei, CHEN Jianbin</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202002021]]></guid><cfi:id>18</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Automatic analysis to vulnerability of ASLR]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202002022]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The ASLR (address space layout randomization) is a defense mechanism to prevent the control-flow hijack. The lack of analysis of the impact of ASLR in existed automatic vulnerability analysis and exploit technologies makes the test cases difficult to be used in actual environment. Aimed at the defects of address randomization and features of its bypass technologies, an analysis method was proposed to deal with the vulnerability of ASLR based on program states transition. The FSM (finite states machine) was used to describe the transition of each key state on the program path, the constraints for some common scenes of memory leakage and control-flow hijack were built, and the vulnerability of ASLR was analyzed by solving the compatibility of memory leakage state constraints and control-flow hijack state constraints. Experimental results show that the proposed method can effectively detect ASLR bypass and control-flow hijack attacks caused by memory leakage, realize the automatic vulnerability analysis of ASLR, and improve the efficiency of software security analysis.]]></description>
<pubDate>2020/4/29 11:02:04</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[HUANG Ning, HUANG Shuguang, PAN Zulie, CHANG Chao]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>HUANG Ning, HUANG Shuguang, PAN Zulie, CHANG Chao</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202002022]]></guid><cfi:id>17</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Study of data based fault diagnosis algorithm update problem]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202002023]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[BITE (built-in test equipment) is widely used in many fields such as fault diagnosis, equipment prognosis and health management. The problems encountered in the process of BITE design and update, including the classifiers update, samples imbalance and hardware limitation, were analyzed, and the initial solutions were proposed. The density-based cluster and artificial immune system were applied to process the raw data; the delegates-based hybrid learning methods were proposed. The evaluation of the solution was validated by the numerical and experiment examples with support vector machine. Results show that the proposed solution can solve the mentioned problems well and is helpful for data based fault diagnosis design and update in the process of BITE maturation.]]></description>
<pubDate>2020/4/29 11:02:04</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[ZHAO Chenxu, TU Yi, QIU Jing, LIU Guanjun]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZHAO Chenxu, TU Yi, QIU Jing, LIU Guanjun</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202002023]]></guid><cfi:id>16</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Remaining useful lifetime prediction based on nonlinear degradation processes with random failure threshold]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202002024]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[For the nonlinear degradation equipment which widely exists in practice, the current RUL (remaining useful lifetime) prediction methods ignore the effect of random failure threshold. Therefore, the RUL prediction method based on nonlinear degradation processes with random failure threshold was proposed by analyzing equipment′s degradation processes. A nonlinear degradation model based on Wiener process with the individual difference and measurement error was built in this work. Next, the degradation states were updated synchronously by applying the Kalman filtering algorithm and constructing the state-space model. And then, the estimation method of failure threshold distribution parameters based on maximum likelihood estimation was proposed to obtain the probability distribution of the random failure threshold. Finally, an analytical and closed-form RUL distribution based on random failure threshold was derived, and the RUL prediction can be adaptively updated with the available observed data. The case study shows that the presented method can significantly improve the accuracy of RUL prediction and thus it has a certain engineering application value.]]></description>
<pubDate>2020/4/29 0:00:00</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[WANG Zezhou, CHEN Yunxiang, CAI Zhongyi, LUO Chengkun]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>WANG Zezhou, CHEN Yunxiang, CAI Zhongyi, LUO Chengkun</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202002024]]></guid><cfi:id>15</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Sensor scheduling method based on minimum risk facing the combat task]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202002025]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[A sensor scheduling method based on the minimum risk was proposed for different target detecting tasks. The risk of active sensor being intercepted and the risk of target detecting were combined to build the sensor scheduling model based on the minimum risk under the form frame of target detecting. Three different kinds of target detecting task, for example, target tracking, target identification, and estimation of targets′ threat level, were considered separately to crystallize the sensor scheduling model based on the minimum risk, with three calculating methods of the target detecting risk given. For solving the model, an improved artificial bee colony algorithm was raised on the basis of the chaos theory, the backward learning and the two-way roulette. Simulations were made to illustrate that the proposed model is feasible and the algorithm is effective.]]></description>
<pubDate>2020/4/29 11:02:04</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[SHAN Ganlin, PANG Ce, DUAN Xiusheng]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>SHAN Ganlin, PANG Ce, DUAN Xiusheng</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202002025]]></guid><cfi:id>14</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Deck operation scheduling method of carrier-based aircraft based on improved genetic algorithm]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202002026]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The support operation process of ship-borne aircraft is constrained by multiple resources, and the interference of emergency may occur at the same time. In view of this characteristic, the amendment strategy of model under the interference condition was analyzed and worked out. The Tabu search operator was introduced into the genetic algorithm to improve the mutation operation of the traditional process. And the simulation results show that the improved genetic algorithm is more efficient than the traditional genetic algorithm in optimizing the multi-carrier aircraft support problem with interference events. The rescheduling scheme is reflected intuitively by Gantt chart. As a result, this method lays a theoretical foundation for effectively dealing with the interference events in the process of ship-borne aircraft support in the real situation.]]></description>
<pubDate>2020/4/29 0:00:00</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[LIU Jue, WANG Nengjian, LUO Xu, MENG Xianglei]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>LIU Jue, WANG Nengjian, LUO Xu, MENG Xianglei</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202002026]]></guid><cfi:id>13</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Research on model reduction of maglev control system under elastic track]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202002027]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In magnetic levitation control system, the elasticity of orbit is often neglected to design control algorithm. Under this control algorithm, when the track stiffness is small, the system is prone to vibration. To solve this problem, the track elasticity can be added to the suspension model, and then the control algorithm is designed. Considering the track elasticity, the model of the suspension system will be more complex, and the control algorithm is difficult to realize in engineering. Therefore, the Hankel norm approximation method is used to reduce the order of the model considering the track elasticity, and the control algorithm is designed on the basis of the reduced order model to solve the system vibration problem caused by the track elasticity. Moreover, this method has the advantage of easily being implemented in engineering. Finally, the feasibility of the reduced order method is verified by the simulation results.]]></description>
<pubDate>2020/4/29 11:02:04</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[LIU Wubin, WANG Quan]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>LIU Wubin, WANG Quan</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202002027]]></guid><cfi:id>12</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Application of improved Dijkstra algorithm in large urban rail transit network valuation system]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202101015]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[With the rapid development of urban subway construction, many city subway lines have been networked.Considering the public welfare when making ticket price, most cities in China calculate the ticket price between the two stations of the line network by the shortest path or the least stations now. the traditional Dijkstra algorithm was improved based on the traditional Dijkstra algorithm. The traditional Dijkstra algorithm and the improved Dijkstra algorithm were respectively used to calculate the shortest walking route of Changsha metro line 1~5 network. Results show that the improved Dijkstra algorithm not only effectively improves the efficiency of the algorithm and overcomes the long-time defect of the traditional algorithm, but also partly eliminate the accumulated errors between lines and improve the ductility of the network.]]></description>
<pubDate>2021/1/26 15:58:10</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[XIE Jianping, CHEN Zhiya, DENG Lianbo, XIE Yibin, YANG Kun]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>XIE Jianping, CHEN Zhiya, DENG Lianbo, XIE Yibin, YANG Kun</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202101015]]></guid><cfi:id>11</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Small sample vehicle target recognition using component model for unmanned aerial vehicle]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202101016]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Detecting and recognizing targets on the ground is one of the typical tasks of UAVs (unmanned aerial vehicles), but it is limited by the task particularity so that it is often difficult to obtain sufficient data about target samples to achieve highly reliable target recognition. In view of this problem, a small-sample vehicle target recognition method based on the component model was proposed, which combined the cognitive characteristics of human beings to improve the perception ability of ground targets. The possible region of the target was extracted by visual saliency detection and objectness detection, and then the GrabCut segmentation method based on the Graph theory and the maximum between-class variance was used to segment the target and to extract the components from the target. A component recognition method based on a probability map model was used to perform component recognition by sparsely representing a component outline as a conditional random field and performing probabilistic reasoning. The Bayesian-based target recognition method was used to determine whether the target was a vehicle. Verification on real images captured by the UAV showed that the algorithm can detect and identify the vehicle target with high accuracy under the condition of fewer samples, poorer illumination and certain occlusion. At the same time, the recognition method can achieve the effect of certain interpretability.]]></description>
<pubDate>2021/1/26 15:58:13</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[NIU Yifeng, ZHU Yuting, LI Hongnan, WANG Chang, WU Lizhen]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>NIU Yifeng, ZHU Yuting, LI Hongnan, WANG Chang, WU Lizhen</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202101016]]></guid><cfi:id>10</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Survey of path planning technologies for robots swarm]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202101017]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[As an important carrier of group intelligence, robot clusters have also received a lot of research and development and more and more applications. Robot cluster path planning technology has also developed rapidly as a core key technology. The technical development status of robot cluster path planning was comprehensively and deeply researched. The basic computing architecture applying to different cluster sizes, scalability requirements, communication requirements, and algorithms of the requirements was innovatively summarized. The basic computing architecture consists of redundant computing architecture, distributed computing architecture, and hierarchical computing architecture. From the perspective of scalability and applicability, the path planning method which takes advantage of the most suitable robot clusters, including bionics, artificial potential field method, geometric method, classical search method and evolutionary learning method, was classified. For the cluster simulation verification research, it provided seven free downloadable or open source robot cluster simulation verification platforms.]]></description>
<pubDate>2021/1/26 15:58:15</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[GAO Ming, TANG Hong, ZHANG Peng]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>GAO Ming, TANG Hong, ZHANG Peng</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202101017]]></guid><cfi:id>9</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Restraining effect of PCP system optimization on electric field signal in the sea]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202101018]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[It is necessary to make the hull potential uniform in order to restrain the characteristics of underwater electric field. A ship hull model in air-sea two-layer medium was established through boundary element method. By changing the number and distribution of sacrificial anodes in passive cathodic protection system, the potential of ship hull and underwater electric field under different protection conditions were calculated quantitatively, and an experiment in laboratory was carried out. Simulation and the experiment results show that the action distance of protection current between anode and corroded area can be shortened by reasonable design of cathodic protection system, which can make share the anticorrosive function of the same area with multiple anodes and can reduce the intensity of protection current output from single anode to improve the uniformity of hull potential, and can restrain the objective of underwater electric field while achieving anticorrosive effect.]]></description>
<pubDate>2021/1/26 15:58:17</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[TAN Hao, CHEN Cong, SHEN Bin]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>TAN Hao, CHEN Cong, SHEN Bin</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202101018]]></guid><cfi:id>8</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Optimal replacement strategy considering equipment remaining useful lifetime prediction information under the influence of uncertain failure threshold]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202101019]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[To improve the scientificalness of equipment maintenance decision-making, an optimal replacement strategy of non-repairable equipment was realized by establishing the optimal maintenance decision model of integrated equipment RUL(remaining useful lifetime) prediction data and uncertain failure threshold. The nonlinear Wiener process was used to establish the degradation model of the equipment and the maximum likelihood estimation was used to determine the parameter estimation of the degradation model. A new estimation method for the distribution coefficient of uncertainty failure threshold based on the EM(expectation maximization) algorithm was proposed. By introducing the virtual failure threshold data, the synchronous iterative update of the distribution coefficient for failure threshold was realized. Based on the concept of the first hitting time, the RUL probability density function of equipment with considering the uncertain failure threshold was derived. The decision model was built on the basis of the renewal-reward theory to determine the optimal replacement occasion. The example analysis shows that the failure threshold of the equipment has an important impact on the result of the maintenance decision. This conclusion fully takes into consideration of the fact that the uncertainty of the equipment failure threshold can not only improve the accuracy of the RUL prediction but also can effectively reduce the life cycle cost of the equipment.]]></description>
<pubDate>2021/1/26 15:58:19</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[WANG Zezhou, CHEN Yunxiang, CAI Zhongyi, WANG Lili, XIANG Huachun]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>WANG Zezhou, CHEN Yunxiang, CAI Zhongyi, WANG Lili, XIANG Huachun</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202101019]]></guid><cfi:id>7</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Evaluation method of aviation equipment′s structure contribution rate to system-of-systems based on fault tree analysis]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202101020]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Aiming at the characteristics of complex composition of aviation equipment system-of-systems, the fault tree analysis was introduced into the evaluation problem of aviation equipment′s structure contribution rate to system-of-systems, and an evaluation method based on fault tree analysis was proposed. The aviation equipment system-of-systems structure was constructed from the three aspects of operation equipment, information support equipment and support equipment. Furthermore, the fault tree of aviation equipment system-of-systems structure was constructed and the criticality importance index of bottom event was used to calculate the aviation equipment′s structure contribution rate to system-of-systems. And the evaluation model of aviation equipment′s structure contribution rate to system-of-systems based on criticality importance was established. Taking an aviation equipment system-of-systems as an example, the results show that the proposed method can evaluate the aviation equipment′s structure contribution rate to system-of-systems accurately and provide methodological support for short board determination and optimization of aviation equipment system-of-systems structure.]]></description>
<pubDate>2021/1/26 15:58:22</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[LUO Chengkun, CHEN Yunxiang, HE Zhen, LI Yan, ZHANG Yangming]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>LUO Chengkun, CHEN Yunxiang, HE Zhen, LI Yan, ZHANG Yangming</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202101020]]></guid><cfi:id>6</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Free vibration characteristics analysis of FG-CNTRC Kirchhoffplates on viscoelastic substrates in thermal environment]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202503020]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[FG-CNTRC demonstrate significant engineering value in advanced equipment manufacturing due to their exceptional mechanical properties and designable characteristics. The critical problem of nano-reinforcement scale effects on mechanical response mechanisms was addressed through integration of nonlocal theory with the Eshelby-Mori-Tanaka method, resulting in the development of a nano-to-macro multiscale constitutive model. Based on mathematical characterization of spatially gradient-distributed CNTs(carbon nanotubes), the thermo-mechanical coupling effects from environmental temperature and visco-Pasternak substrates were incorporated. Vibration governing equations for nanocomposite structures were established through Kirchhoff plate theory and energy variational principles, with characteristic frequencies of simply-supported plates subsequently solved. The influence mechanisms of CNTs′ characteristic parameters and thermo-mechanical coupling effects on the natural frequency of structural systems was analyzed. Results demonstrate that the constitutive model effectively characterizes the stiffness-weakening effect induced by CNTs′ scale effects. This effect simultaneously suppresses the stiffness enhancement from substrate elastic parameters while significantly increasing sensitivity to temperature variations. Moreover, the critical volume fraction for structural reciprocating vibration shows positive correlation with substrate damping parameters.]]></description>
<pubDate>2025/6/3 0:00:00</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[WU Dong, ZHANG Dapeng, YU Baoshi, LEI Yongjun]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>WU Dong, ZHANG Dapeng, YU Baoshi, LEI Yongjun</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202503020]]></guid><cfi:id>5</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Markov chain reliability optimization method for augmented spacesubset simulation]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202503021]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Aiming at the reliability-based design optimization problem of complex structural systems, an efficient optimization method based on subset simulation and Markov chain simulation in augmented space was proposed. Considering the reliability-based design optimization problem in which the design parameters were distributed parameters of basic random variables, the target failure probability was transformed into a posterior density function of the design parameters in the augmented space, obtained a set of initial failure samples in the whole design domain through subset simulation, and then adopted the efficient Markov chain simulation to generate more failure samples in the gradually smaller design domain under the sequential approximate optimization framework. The target posterior density function was estimated and updated, and the decoupling approach was used to solve the transformed optimization problem to finally obtain the optimum. Compared with the existing methods, the proposed method requires only one reliability analysis and can avoid local optimal solution, resulting in the global optimal solution. Examples were given to illustrate the applicability of the proposed method in engineering and its superiority in the accuracy and efficiency of analysis and calculation.]]></description>
<pubDate>2025/6/3 0:00:00</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[YUAN Xiukai, CHEN Jingqiang, ZHANG Jingyu, TAN Zhiyong, DONG Yiwei]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>YUAN Xiukai, CHEN Jingqiang, ZHANG Jingyu, TAN Zhiyong, DONG Yiwei</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202503021]]></guid><cfi:id>4</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Research on the influences of motion characteristics of rodjet under water]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202503022]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[To thoroughly investigate the underwater motion characteristics of rod jets, the effects of liner thickness, material, and charge length-to-diameter ratio on the underwater motion characteristics of rod jets were systematically explored by combining experimental methods with numerical simulations. The results show that after entering the water, the rod jet undergoes head upsetting and experiences mass erosion effects. The effective length of the jet initially increases and then decreases during its motion, while its average velocity decays exponentially. Further analysis indicates that increasing the liner thickness and charge length-to-diameter ratio can significantly enhance the jets resistance to erosion and its ability to maintain velocity. The optimal range for liner thickness is 0.036<i>D</i><sub>k</sub> to 0.055<i>D</i><sub>k</sub>. When the charge length-to-diameter ratio exceeds 1.25, the influence of charge structure on the underwater motion characteristics of the rod-shaped jet gradually diminishes. Additionally, material density has a significant impact on the velocity decay law of the rod jets during underwater penetration: the higher the density, the stronger the jets ability to maintain velocity; when material densities are similar, the velocity decay laws of the jets tend to be consistent. The study also demonstrates that liners made of copper, tantalum, and tungsten are all suitable for underwater shaped-charge warheads. This research provides important theoretical support and reference for the design optimization of underwater shaped-charge warheads.]]></description>
<pubDate>2025/6/3 0:00:00</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[CHEN Xing, LU Yonggang, ZHANG Cunwang]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>CHEN Xing, LU Yonggang, ZHANG Cunwang</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202503022]]></guid><cfi:id>3</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Application of fuzzy analytic hierarchy process in comprehensiveevaluation of suspension system in high-speed maglev train]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202503023]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to comprehensively and scientifically evaluate the performance of suspension system in high-speed maglev train, a comprehensive evaluation method was designed based on fuzzy analytic hierarchy process. According to the operation law and capability characteristics of suspension system, an evaluation index system was proposed to characterize the performance of suspension system. The fuzzy analytic hierarchy process was used to determine the weight of the performance index of the suspension system, and a multi-layer fuzzy comprehensive evaluation model of the suspension system was established based on exponential scaling method and trapezoidal distribution method. A comprehensive performance evaluation system of suspension system based on operation data was developed, and the dynamic operation test was carried out on the Shanghai 1.5 km test line by using a 600 km/h high-speed maglev train. Results show that the comprehensive evaluation method of suspension system based on fuzzy analytic hierarchy process can comprehensively evaluate the performance of suspension system and realize the quantification and visualization of the evaluation results.]]></description>
<pubDate>2025/6/3 0:00:00</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[ZHAI Mingda, LIU Xin, LI Xiaolong, LONG Zhiqiang]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZHAI Mingda, LIU Xin, LI Xiaolong, LONG Zhiqiang</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202503023]]></guid><cfi:id>2</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Theoretical and simulation analysis of the pulsed LDV]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202503024]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Continuous-wave LDV (laser Doppler velocimeters) are limited in low-altitude velocity measurement due to factors such as the low power of continuous-wave lasers and optical system diffraction. By introducing the concept of "virtual distance" to expand the Feuilleté model, the time-domain echo signal model for pulsed LDV had been established. Simulation results indicate that pulsed LDV can perform velocity measurement through the accumulation of hard target echo signals. Pulsed LDV can also utilize longer laser pulse widths for detection without restricted by spatial resolution, the feasibility of high-precision velocity measurement using long pulses with pulsed LDV is verifies, laying a theoretical foundation for future experimental validation of the pulsed LDV. Pulsed LDV is capable of detecting echo signals scattered from targets at 5 km and beyond, significantly extending the working distance range of LDV. This makes LDV applicable in integrated navigation of low-altitude aircrafts and planetary surface landing navigation for spacecrafts, and other scenarios that require long-distance high-precision velocity measurement.]]></description>
<pubDate>2025/6/3 0:00:00</pubDate>
<category><![CDATA[机械工程·控制科学与工程]]></category>
<author><![CDATA[CHEN Lanjian, ZHOU Jian, JIN Shilong]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>CHEN Lanjian, ZHOU Jian, JIN Shilong</atom:name>
</atom:author>
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