Abstract:A patched-conic technique is used to formulate the mathematical model and to make an explicit analysis of the normal-impact transfer trajcctory to the moon. Some approximations are required in order to obtain the analytical solutions of the normal-impact transfer trajectory to the moon. It is a practical engineering method for preliminary trajectory designing.

Abstract:In the light of structural characterstics of gas-filling light-copying decoy，we discuss high power laser interation with gas-filling light-copying decoy，and the change of decoy motion velocity after decoy is attacked by high power laser. Besides，its trajectory deflection has been calculated.

Abstract:The steady fault mathematical mode of large LH and LO rocket engine is built according to the process of engine. This mathematical mode contains seventy capable parameters and forty five disturbing parameters，in whide the Broyden method is adopted to find the solution. It has established the right way to simulate the fault. Finally we analyse the result of the simulation，at the same time，we compare it with the hot-test. They coincide well.

Abstract:Based on the fuzzy measuring of fuzzy rule sets，a scheme system used for fault diagnosis is proposed in this paper. The extraction of fuzzy rules involves two steps: (1) the whole space of the trained data is adaptively divided into subspaces in the form of hypersphere. It is probable to solve the problems of recognition in the high dimension space. (2) A fuzzy rule in each subspace is generated and confidence of each fuzzy rule calculated. We extend the conception of the traditional fuzzy rule for the purpose of resolving the contadictions among the generated fuzzy rules. The simulation research has shown that the fuzzy measuring of the fuzzy rule sets can be used for the fault diagnosis of the liquid rocket engine.

Abstract:Shooting probability is an important parameter of submunition efficacy. In this paper. a simple approximate method is given for calculating percentage of hits of submunition attacking large (linear) object. The calculating results show that approximate method is of computational advantage and the results are satisfactory. Then the concept of block probability of submunition is introduced and discussed in this paper. The results would be useful reference for further research of submunition.

Abstract:In this paper，an approach to spacecraft returning reentry guidance is described. The composite shutdown guidance scheme is put forward in the paper，which is applied to decrease reentry state parameters error caused by retro-error in returning phase. And then，reentry guidance law is studied. Finally，it's correctness is proved by simulation.

Abstract:This paper describes the study of monitoring methods suitable for condition monitoring of gear-reducer of shipboard steam-turbine. At first monitoring methods and feature extracting techniques are analyzed. A generic monitoring flaw is presented. Then，some relevant issues such as evaluation of monitoring methods，criterion of monitoring feature selection and strategy of decision-making，are discusscd. Finally，a brief application is demonstrated.

Abstract:This paper presents a mathematical model of the control system of AGV. First the article studies the kinematical characteristic，analyses the relationship between the deviation and the velocity of the wheel. Then the dynamic configuration is derived，which is a multi-input and multi-output nonlinear system. Finally it is simplified into a single-input linear model by the small deviation linearized method. This model has been applied to a laser guided vehicle. Higher accuracy have been shown by test results.

Abstract:A method to write linear network state equation is introduced by means of equivalent circuit. One of the advantages is that it is unnecessary to write any equations，and especially the complex calculating process of the non-state variables can be omitted. A method is proposed to check the dimension so as to determine whether it has any mistakes，it there is any，it can be corrected in time.

Abstract:In view of the characteristics of high accuracy，poor manufacturability，high residue or waster rate and long production period of complex part manufacturing，based on discussing virtual product developing technique and modeling system，a new mode is presented in this paper for complex part development. This new mode involves the work-out, design，analysis, simulation, assembly, test，evaluation of performance and economy, rapid modeling and product data management of the product under virtual status.

Abstract:Tracking a maneuvering target in a nonlinear interference environment has been discussed in some literature，and this paper considers the problem of tracking with multiple passive sensors in the non-Gaussian noise environment. The measurements possibly include random interference and Glint noise. The method of target state estimation in this paper is a dynamic programming approach. Unlike the traditional method，we reduce the estimating problem to a multiple hypothesis-testing problem，and then use the dynamic programming algorithm to solve the problem of tracking with non-Gaussian noise. The simulation results show the superiority of the new method.

Abstract:To perform high-speed data acquisition in UWBR，this paper discusses the availability of direct sampling of IF/RF signal and digital quadrature detecting technology on wide-band signal（>=20MHz) demonstrating. Three digital detecting methods are analyzed by computer simulation. The results shows a great improvement on the conformability of phase and magnitude as well as image ratio (IR)，which is less than-30dB in classical detectors.

Abstract:The paper discusses several association techniques based on information fusion in bistatic radar systems. It is also presented in the paper that the attribute parameters of targets such as Doppler frequency and radar cross-section should be used to improve the association ability of the system for multiple targets in jamming. The paper proves the validity of the association technique via simulation way.

Abstract:The paper provides three methods to evaluate link importance in communication networks. The methods are compared one another to distinguish their goodness. These method can be applied to the design of network and the improvement of network reliability.

Abstract:In lattice vector quantization，the codebook is made up of lattice points as quantization vectors. It is essential to give an index to a lattice point，so that the output of quantizer can be stored or transmitted. In our study of data compression，an entire research is given to the problem of the index of lattice points in pyramidal lattice vector quantization，and index algorithms are presented to index the lattce points of some usually-used lattices，such as Z^L、D_L、E₈ and ∧₁₆so on.

Abstract:Based on ditect integration method (DIM) and surface radiation pattern method (SRP)，a new modified surface radiation pattern (MSRP) method is suggested for the calculation of the mutual coupling from waveguide antenna elements on conformal surfaces. The results of the cylinder indicate that MSRP is more accurate than SRP and better than DIM'MSRP is also good at dealing with the mutual coupling of elements with arbitrary polarization.

Abstract:This paper analyzes several important factors contributing to the communication latency in massively parallec processors. summarizes the research background and prposes some schemes to improve the communication performance.

Abstract:The method combining numerical simulation with analytical solution of strong explosion was employed to determine blast load on the inner wall of an explosive chamber produced by a concentrated charge with different weight. The calculated results were compared with those of experiments at several typical position on chambers and showed a good agreement. The approach can eliminate the numerical oscillation near the symmetric center of chambers and was effective to determine the blast load.

Abstract:The phase-space finite element method is applied to the multigroup neutron transport equation in cylindrical critical systems. The continuous piecewise polynomial trial functions are trilinear in the space variables and bilinear in the angle variables. Elements are triangular in the spatial domain and rectangular in the angle domain. Galerkin method is used to derive a set of simultaneous algebraic equations. The coefficient matrices of the algebraic equations are compressed and stored. The resulting finite element equations are solved by gaussion elimination method. Numerical results are compared to those obtained by SN calculations. FEM was observed to yield a higher order of convergence and accuracy.

Abstract:A silazane oligomer with low viscousity and latent active groups（Si-H and Si（CH = CH₂)) was prepared by coammonolysis of MeSiHCl₂ and Me（CH₂=CH) SiCl₂. H₂PtCl₆（dehydrated) and dicumyl peroxide (DCP) were found to be effective to catalyse or initialise crosslinking of the silazane oligomer respectively. The crosslinked polymer was pyrolysed in a tube furnace to obtain high yield(over 74%wt)ceramic at 1273K.

Abstract:In this paper the inhibiting function and its mechanism of the Ce³⁺ion to the pitting corrosion on LY12CZ aluminium alloy in O.1mol? L^-1 NaCl solution are studied by using coulostatic pertubation method. The results of research show that the process of the pitting induction and the formation of cerium conversion film on aluminium alloy surface have similar electrochemical model. The rate controlling step of the electrochemical corrosionis thei nterface process of passivation layer(or conversion film)and solution. The Ce³⁺ can inhibit the pitting induction and developing process of the alluminium alloy. After the cerium conversion film is formed，the electrical impedance on the surface of aluminium alloy would increase and the anticorrosion will enhance.