Abstract:Using modified strip distributed transfer function method, a strip element model with two nodal lines and four degrees of freedom is built for the analysis of static response. The rectangular region is divided into strips by nodal lines. The border lines are discrete. The displacements and angles of the inner lines and boundary nodes are unknown. An super element, which can couple with finite elements, is given using cubic interpolation. By using generalized function, an accurate integration method is developed to get the explicit formulation of the matrixes involved. This can improve the accuracy and efficiency of the method.

Abstract:A general solution of differential equation for transverse displatement function in free vibration of rectangular thin plate on elastic foundation is obtained. It can be used to solve the vibration problem of rectangular plate with arbitrary boundaries. For example, a square plate with two adjacent edges fixed and other two free have been calculated.

Abstract:A dynamic model of gas turbine, which takes both before-turbine and post-turbine capacity into consideration, is developed. The dynamic behavior of gas turbines in start-up by high-pressure gas is calculated by using the model, and its principal influence factors are analyzed. The calculated results show that the before-turbine capacity has notable influence on the transients of both entrance and exit pressures of the gas turbines, the post-turbine capacity mostly affects the dynamic processes of the turbines' exit pressures, and has little influence on the turbines' entrance pressures.

Abstract:A new algorithm based on genetic algorithm is formulated. A set of constraint equation is used to get float ambiguity, then Integer Gauss transformation is used to reduce the correlativity of ambiguity, then integer ambiguity is searched in transformed space using genetic algorithm. Two mutation operators are used to avoid early convergence under the condition of small population size. Simulation shows the new algorithm is more robust and efficient compared with SGA.

Abstract:The chemical non-equilibrium three-dimensional viscous shock layer flows are calculated numerically. The coupled solutions of the chemical non-equilibrium viscous shock layer flows are obtained through space-marching and global iterations.

Abstract:The motion of the plasma with an initial velocity distribution in magnetic mirror field is described by using PIC particle simulation methods, and the particle tracks of the plasma motion in magnetic mirror field can be obtained. It is proved that the magnetic mirror field can confine the motion of plasma and PIC particle simulation method is feasible and effective to simulate the physical process of the plasma in the magnetic mirror field.

Abstract:PSpice equivalent circuit is created to simulate the process of a Vircator driven by an inductive storage system. Current through and Voltage across the Vircator are investigated using the circuit. The models for electric exploding wires and vircator are established, which could be used to quickly form the simulation circuit and obtain the simulation results. Numerical results show that parameters of the pulse transformer and the electric exploding wires along with the transparency of the anode foil affects the voltage and the current of the Vircator load.

Abstract:New magnetically insulated line oscillator(MILO) designs with modified structures are presented and simulated by 2D particle-in-cell (PIC) code. Relations among some parameters are analyzed. The output varying with input voltage and slow wave structure is found. That the operating frequency remains unchanged with input voltage is proved numerically and experimentally. Experiments also show that a start voltage is need for MILO to work.

Abstract:In the pressure recovery system of a high-energy chemical laser, the ejector is a very important equipment. Its efficiency influences all the system. In this paper, theory of the engineering calculation of the ejector efficiency is studied. The conservation equations are used. Since in an ejector, active and passive air has diffierent thermodynamic and physical constants. This influence must be considered in calculation. The results of the calculation of diffierent parameters show that some parameters have important influence. Some qualitative rules have got for engineering design.

Abstract:We consider the numerical solution to the boundary value problem, using a method of fuzzy simulation based on difference method, while discussing the differential equation of the second order in fuzzy boundary value condition.

Abstract:Linearization of power amplifiers has become an important issue, with the advent of linear modulation methods in mobile communication. The predistortion is the most commonly used technique for linearizing an amplifier in order to improve the linearity degree of amplifiers and reduce the out-of-band emission of the transmitter. An adaptive predistorter for linearizing a power amplifier in a mobile transmitter is studied utilizing a complex spectral convolution. Analytical and simulation results show that a complex convolution method which requires no additional local oscillator or phase reference can be used to measure the out-of-band power and utilized the scalar quantity to update the predistorter's coefficients, in order to minimize the out-of-band power.

Abstract:This paper first describes shadow volume algorithm, then discusses the new algorithm of shadow volume based on structural box and ray casting technology. The shadow effect produced by the algorithm has LOD.

Abstract:The applications and the limitations of multi-channel parallel sampling technology in high-speed data acquisition systems are presented; then we introduce a method to measure the timing skew of the multi-channel sampling system. Secondly, a new method to calibrate the timing skew, which can improve the performance of multi-channel parallel sampling systems, is proposed. Finally, this method is simulated and proved to be feasible and excellent.

Abstract:This paper demonstrates a kind of software design method based on TMS320C62x, implements the target recognition algorithm based on wide-band milliwave radar time-delay neural network on TMS320C62x EVM board,and achieves better effect through programming testing.

Abstract:We propose a new method to construct the network topology of distributed information fusion system. Firstly, the status quo in this area is briefly introduced. Then, based on in-depth analysis about the network structures in existence, we propose the multi-layer de Bruijn network method. In the end of this paper, the routing problem of the multi-layer de Bruijn network is discussed.

Abstract:Pre-Detection of interfered channel is absolutely necessary for FH communication. This paper presents a new method named adaptive passive pre-detection algorithm，which identifies the interfered channel easily without transmitting detect signal. This method is simple to implement and improves the system performance of anti-jamming obviously.

Abstract:For the problem of De-ambiguous in the measurement of range by phases under stagger relation of frequency difference, we give the condition of correctly De-ambiguous under relatively prime stagger relation and actual noisy circumstance and the proof. Then we discussed fast algorithm for De-ambiguous problem, theoretical ranging error when ranged by stagger frequency difference, and the SNR value that assure De-ambiguous reliably.

Abstract:Distributed object technology is a good solution of software development and integration, but traditional invocation models of distributed object restrict the application of distributed object technology in high-performance distributed computing field (eg. Distributed transaction processing, distributed interactive simulation and distributed parallel computing) due to their lack of asynchronism. So, this paper presents a new asynchronous callback model based on distributed object and mainly discusses the definition, key implementation technology, optimization strategy and performance test.

Abstract:The expressiveness of current CORBA IDL is poor. Semantic properties of distributed objects can't be documented formally. The automation of the software development in CORBA is limited to the generation of the stub and skeleton that support basic functions. A kind of mechanism for customizing the dispatching and layering strategies of distributed objects is provided through extending the annotations used for describing objects behavior in IDL files. The mechanism not only improves time and space performance of applications, but also has no effect on portability and interoperability of applications. Moreover, a design pattern to resolve similar problems is presented by extending CORBA IDL.

Abstract:The applications of IDEF0 method in military integreted information systems analysis, design, updating, integration, and simulation are discussed in detail. For IDEF0 model is simple but comprehensive, and with powerful ability in system description, it is widely applied in various fields, especially in manufacturing. Military integreted information systems, based on information and supported by activity, are large and complex systems. With IDEF0 model, the common understanding of the systems both for the military commander and the technical engineers can be deepened. So it can improve the effectiveness and practicability of development of the military integreted information systems.

Abstract:To proper use the prior information, the concept of confidence of prior information is introduced. Then, the multi-sensor data fusion method for the prior and testing information is given. Finally, the Bayesian accuracy detection algorithm is designed, and an example of application is discussed to explain this method.

Abstract:The problem of missile hit accuracy assessment is studied by using prior information and extra-small field samples.Based on Bayes theory and stochastic weighted method, a new method of accuracy assessment has been put forward and validated by some calculated examples.

Abstract:A method of applying data fusion technology to computer generated forces modeling is presented. It first analyzes data fusion technology, then discusses in detail the filtering method of combining Kalman filtering and least square, and an improved Hopfield neural network as well. With applying these models to a practical system, the simulation result is given. It holds a great promise of combining data fusion technology with CGF modeling.

Abstract:Among the theoretical and experimental research of the reflective intensity-modulated fiber optic sensor (RIM-FOS), a very important problem is always neglected, which is the effect on the intensity modulation caused by perpendicularity between the axis of fiber pairs and the reflector, i.e., the obliquity of the reflector.In the light of this, the mathematical analysis of this effect is performed.The simulation results of the RIM-FOS characteristic parameters with the different obliquity of the reflector are computed and the characteristic curves are plottedResults show that the obliquity of the reflector exerts great influence on the modulation function of the fiber pair.So advice is presented that the axis of fiber pair should be perpendicular to the reflector.

Abstract:Dynamic equations are derived using reduced tree model for close-chain mechanisms. The PD-based control strategy is employed to control the manipulators. In order to eliminate internal forces inherent in redundant mechanisms, a new method based on static force transformation is presented without forces feedback. Finally, a 2-DOF planar redundant parallel manipulator is utilized as the control example. Experimental results show the validity of the derived dynamic model and the proposed control method.

Abstract:A CAN board acted as the interface between PC and controller area network is designed and its virtual device driver under Windows9X OS is developed, which ensure that PC can be successfully used in CAN. Micro controller on board accomplishes underlying communicating tasks, and exchanges data with PC through dual-port RAM. This system, which characterizes simple structure and good reliability, has been applied to maglev successfully.

Abstract:This paper puts forward the concept of task, which essentially stands for an independent knowledge source.A knowledge base can be constructed with tasks organized by forward or backward links, which implements well-structure and visualization of knowledge bases and supports the reuse and share of knowledge components as well.In addition, HESTool, a practical expert system tool based on hierarchical knowledge base, is developed with visual and database technology. A modeling scheme is provided in HESTool.