Abstract:This paper presents a robust controller design approach based on the design parameters uncertainty, which combines this method with multidisciplinary design optimization, and realizes MDO in the design loop in control disciplinary. The parallel optimization design of aerodynamics and control disciplinary for a given tailess MAV is studied to illustrate that this method is feasible.

Abstract:The optimal ascent trajectory design of the vehicle is an optimal control problem with strict terminal constraints and variable final time. The classical algorithms always encounter the problems of high sensitivity to initial guess and local convergence in solving this problem. Aiming at these problems, genetic algorithm (GA) which is of good global convergence is applied to designing the optimal ascent trajectory .In order to improve the convergence rate of GA and overcome its premature problems, two hybrid GA (HGA) combining the merits of GA with those of simplex method are proposed. The computational results testify that the two HGA are effective global optimization approach for solving complex problems, and they can successfully solve the optimal control problems with variable final time.

Abstract:To survive the laser's attack, ballistic missiles can spin to reduce the dwell time of the beam at a particular point on the missile. The realzation of stability is different from before. We design the missile's autopilot by the method of classical control theory and MFD technology. The simulation result shows that the unsteady aerodynamic ballistic missile can fly stablly at the low spinning rate during the first boosting phase.

Abstract:A final inflation model for parachutes was established. The forebody, suspension lines and canopy were modeled as a series of elastically connected mass nodes. The flow field inside the canopy was two-dimensional inviscid, incompressible flow. The model was used to calculate the variations of the canopy shape, the variations of canopy projection area and the tension of the suspension line during the final inflation phase. Numerical results were compared with the experimental data and found to be in agreement.

Abstract:In order to further research the physics characteristics of nano-semiconductor, we get the nanometer size InSb particle films deposited on the SiO₂ substrate by using vacuum evaporation. The atomic force microscope was applied to survey the surface morphology of the films. The results show that the films are composite of nano-particles of InSb. From the analysis of the scanning images of these samples, the result of the experiment proves that by changing the plating time, different sizes of InSb particle can be formed.

Abstract:Silicon carbide fibers were coated with iron (Fe) via the chemical vapor deposition (CVD) method. No obvious changes were observed for the silicon carbide fibers' tension while the coating process continued, but the strength of the iron-coated fiber declined accordingly as a result of the increased diameter. The resistivity decreased greatly. The dielectric constant of the iron-coated fibers could be adjusted in a wide range under different process conditions. Magnetic loss was introduced due to the inherent property of the iron. The dielectric constant and magnetic permeability could be improved under lower depositing temperature and higher flow rate of carrier gas.

Abstract:The real-time detection algorithm of the moving point target inimagesequences is one of the keyalgorithms in manyreal-timeprocessing systems. This paper presents a point-track predicting andmatchingdetecting algorithm after analyzing severallevelmethods of the moving point target in image sequences. Based on theperformance ofsimulation test, we point out theintroduced algorithm can detect low SNR moving point target in image sequenceseffectively. The algorithm can detectmulti-target trajectory in same image sequencessimultaneity.

Abstract:The observability analysis is a key problem of SOPLAT (single observer passive location and tracking).Becauseofthehigh nonlinear of TOA measurement equation, the observability matrix which is got by calculating Jacobin matrix is toocomplextoobtain explicit analysis conclusions. A linearization equation is deduced through a new idea, and the observabilityconditionsofSOPLAT using TOA and DOA measurements are obtained. Finally, a compute simulation result is presented.

Abstract:The remote sensing image registration is one of the most important issues of image fusion. Researchers always focus onsearchingadaptive, accurate and fast registration algorithm. A feature matchingalgorithm based on classification is proposed, which uses the correlation of the classified images to realize a precise registration after a coarseregistration.Experimentresults show thefeasibility andadaptability of the method. To bothhomogeneous images andheterogeneous images, theregistrationresults reachsub-pixelprecision.Thecost ofcomputationis farless than that of theconventionalmethodsthroughgray-basedcorrelation orfeature-basedmatching.

Abstract:A novel approach of extracting the high resolution signaturesof the ballistictarget in midcourse is proposed. This methodprocesseshigh-resolution radar echo by using STRETCHand extracts the signature of thetargetby using ESPRIT,includingthe positionand intensityof scattering centers.Then, the methodof Gerschgorinradii is used to estimate the number of scatteringcenters forremoving theillusive frequency dot. Compared with the FFTalgorithm, thisapproachpossesses higher resolution powe and can suppressthe clutter moreeffectively. Simulation results verify theeffectiveness of the method.

Abstract:It is the current trend that microprocessors extend their instruction set to speedup the multimedia applications. Intel'sMMX, SSE and SSE2 are good example. But do the multimediaapplications favorthesearchitecturefeatures? And does thecurrentsoftwaresupporttheseinstruction sets and make full use of them? These questions are of muchconcerntothe researchers. Weinvestigate theperformancecharacteristics of 2MPEG4Videoplayers on an Intel P4 baseddesktop PC bymeans ofdynamicprofiling.BasedonIntelVtune, a hardwareperformancemonitoring tool, we obtainaccurateperformancedata. And we make indepthanalysis of the obtained data based on themachine'sarchitectureparameters andperformanceprofiles. We find that the 2applicationsmakegood use of 64-bit MMXinstructions. But theyrarely use SSE and SSE2instructions. Theperformancedegradation due to Cachemisses at tow levels of Caches is remarkable. Toenhance theperformance ofMPEG4 mediaapplications,improvingmemoryhierarchyperformance andoptimizing themediaplayers are moreeffective ways thanemploying moreadvancedmultimediainstruction sets.

Abstract:The paper adds an expert system module, that is a predictionanalysismodulebasedontheartificialneuralnetworkintothe traditionalmanagementinformationsystem for the complexnonlinearpredictionto improvethe capability and automationof the MIS. The modulecarries out the prediction using the BP neural network. The BP neural network gets the inherentrelationbetween the inputs and outputs and the solution of the involved problem by adjustingthe weight of the neural network on line. This paper predicts the bookmarket of thepublishingcompanyusing the expert system. The result shows that themethodpossesses the excellent performanc, and can be used as an effective method forpredicting the bookmarket.

Abstract:The amounts of remote sensing images of global coverage will grow exponentially. To study and achieve fast and effective automatic registration of these digital data with high accuracies has become a critical problem in remote sensing. The status of the research on automatic registration of remote sensing images is presented firstly, and some relevant key techniques are discussed. And then, the existing registration algorithms are classified and analyzed from the point of a novel view, and an integrative solution is given. At the same time, three new parallel strategies are proposed with the good experiment results. Because the proposed algorithms are based on the data parallel model of coarse grain, their salability and portability are good, which can be a valuable reference for practical applications in remote sensing. Finally, the problems and challenges of the future research are pointed out.

Abstract:In order to resolve the disadvantage that much time is consumed for computing the trace of the sample covariance matrix with the traditional method when the samples continuously increase, a fast recursive algorithm is presented. The theoretical analysis and the simulation results all show that compared with the traditional method, the consuming time with our method is decreased by one order of magnitude, so it can reduce a great deal of computing time.

Abstract:The advantage of the overmoded slow-wave structures (SWS) in enhancing power capacity is analyzed theoretically. The dispersive characteristics of the rectangular corrugated overmoded SWS with the infinite length and the finite length are investigated through the theoretical method and the finite-element-method, respectively. The TM01 mode dispersive characteristics in the two cases are compared, and the results indicate that there are differences in the values of the longitudinal wavelength and its relevant frequency. The results can provide valuable reference to the design of the high-frequency structure of the high-power microwave devices.

Abstract:The non-linear and time-varying mathematical model of the anti-lock braking system (ABS) is established, and the application of sliding mode variable structure controller (SMVSC) in ABS is implemented. Two kinds of estimation algorithms of the optimal slip ratio realized by recursive least squares are proposed: one based on the mathematical model of cohesion coefficient vs. slip ratio curve, the other based on the shape of this curve. The simulation results show the feasibility and validity of SMVSC based on optimal slip ratio.

Abstract:Aiming at to the special demands for angles measurement while drilling underground, the paper describes a new approach of determining the pitch and the roll with a single-axis accelerometer and a dual-axis accelerometer. A feasible temperature compensation method is adopted in our established systemCorresponding experimental results are described. Results show that the system has the advantages of small size, low cost, and its accuracy is better than 1°C. It is especially suitable for directional drilling to obtain the desired angles.

Abstract:A novel formulation of the visual motion estimation problem is analyzed in terms of identification of the nonlinear implicit system with parameters on the so called “essential manifold”; and a new and unified implicit adaptive extended kalman filter (IAEKF) is proposed to perform the estimation in the local coordinates, for both discrete and continuous cases. The correctness of the algorithm is illustrated by numerical simulations.

Abstract:A three degree-of-freedom attitude adjustment mechanism is proposed. Direct kinematics was studied and the results indicate that the relationship between the angles the supporting system rotates and the attitude (α,β,γ)of the model is nonlinear and coupled. Based on the specific structure of the supporting system, geometric method was adopted to obtain the inverse solution.

Abstract:PFC-PID cascade transparent control strategy is presented with actions of typical electromechanical servo system. The random disturbance is surpassed in inner-loop with PID control, and the internal loop is the generalized control plant of the external PFC loop. The inner model of PID is the first-order plus the dead-time model which is gained by matching generalized control plant. The paper analyses the implementary arithmetic in the servo system with saturation and lag segment, and analyses the performance of the close loop to obtain the condition of stability and robustness. The simulation results show that the new PFC-PID control method is of robustness and the ability to suppress disturbance.

Abstract:Let s be an infinite regular cardinal number, F be a filter of a set I.The characterizations of the related structure on coeffeicient ring R has been given by s-product and F-product of modules.As applications,some known results has been generalized.

Abstract:The traditional reliability concepts aim at static logic, which are no longer satisfy the requirement of the modern complex dynamic system reliability analysis. This article provides a different state space and structural function for describing dynamic system reliability. Then concepts of failure sequence and failure cluster are defined for characterizing dynamic systems' failure mode. They are extensions of the traditional static reliability concepts such as cut set and implication set, which are the special example of the provided concepts. The analog concepts including probability importance degree, structural importance degree and critical importance degree are also put forward. At last the relative concepts are illustrated using a simple example of dynamic system.

Abstract:It is very important to know whether the combat effectiveness of the armored vehicle is good enough to satisfy the requirements in the future war. Combat modeling and simulation is a good method to know combat effectiveness of the Armored Vehicle in its development. On the base of the combat simulation, the main index in the evaluation, of the combat effectiveness is selected and synthesis model is built to evaluate the combat effectiveness.

Abstract:We designed a kind of fuzzy illation method with enhancement property to synthesize some kinds of seismic event discrimination criterions. Using this method, we researched a synthetic discrimination method of nuclear test seismic monitoring with fuzzy logic illation, and listed its theory framework. The case study showed that by this method we will be able to decrease the population of suspicious seismic events in nuclear test seismic monitoring.