Abstract:The three dimensional hypersonic viscous flow of perfect gas over a capsule is calculated numerically. The Navier-Stokes equations are taken as the governing equations. The implicit NND scheme is used for the shock capture. The computation region is involved with the full flowfíeld from the nose to the base. The flowfield properties and the areodynamic force coefficients thus obtained are good compared with the experiment results.

Abstract:This paper deals with the mechanism of molecular in elastic collision，presents the probability selective models of molecular internal excitation and molecular reactions，and introduces the energy transfer models among translational energy，rotational energy and vibrational energy. The results of the stagnation streamline flow of a hypersonic blunt body obtained by DSMC method conform with the results obtained by viscous shock layer (VSL) equation method at the lower altitude，which shows that models used in the DSMC simulation are appropriate.

Abstract:A large controllable parafoil can be used for spacecraft non-damage recovery at the planned-point. Its flare manoeuvre performance is of great importance to safe recovery. In this paper，a 4-DOF dynamic model of parafoil system for recovery is presented. The influence of system parameters and flare manoeuvre control method on landing performance is discussed. The optimal system parameters and landing control method are given.

Abstract:In this paper，the viscoelasitc finite element analysis program used for a polyurethane cellular plastic bush is discussed. Stress relaxation in the axisymmetric bush is calculated by utilizing integral constitutive relation. It can be seen from the numerial results that the assembling stress relaxes by about 25% after the bush has been stored by 1000 hours.

Abstract:According to the force of connecting place and feature of the locking device，the possibilities of loosening in the connecting place of the satellite and launching vehicle are studied in this paper. The formulae of preforce the wrapband needs are obtained by applying the theory of a general force system and friction. The distribution of wrapband stress is analysed，and the method for solving the nonuniform distribution of the stress is put forword. Compard with the experimental results of the two types of the device，it is proved that the method of analysis and the formulae of calculation are reliable. The conclusions provide a basis for designing the locking structure of a satellite and launching vehicle with wrapband.

Abstract:Based on the research of the wrist actuator transmitted by spherical gear，this paper presents a new wrist drive mechanism. First its kinematic problem is analyzed and the kinematic model is developed. Then its solution of kinematic equation is presented. Finally，the resul of the analysis verifies the definition and accuracy of the drive mechanism.

Abstract:In precision and ultraprecision cylindrcal turning or grinding it is customary to support the workpiece with dead centres. In this paper，the effect of abnormal supporting conditions on roundness of workpiece in precision machining is discussed. Through an analysis of the relationship between the locus of the central point of the centre hole profile and frequency spectra of the out-of-roundness of centre and centre hole，the effect of geometrical deviations of centres and centre holes on roundness of workpiece the mechanism is described. An available avenue to improve the accuracy in precision and ultraprecision cylindrcal turning or grinding by centres is presented in this paper.

Abstract:In view of the Fuzziness and the uncertainty of the expert knowledge of the fault diagnosis expert system，this paper presents a method of Fuzzy production rule (FPR)knowledge representation by using Fuzzy Petri nets(FPN)model，knowledge store and Fuzzy reasoning mechanism，and gives the algorithm implementation. Furthermore，taking the fault diagnosis expert system for the JCS-020 (FANUC) manufacturing center as an example，We have proved in this paper the feasibility and validity of the method.

Abstract:In this paper，a computer aided geometry modelling software developed by the authors is described. It can be used to streamline both ends of the high speed train. An example designed with this software is presented.

Abstract:An adaptive active noise control system based on micro-computer is presented in this paper. This system can supply an agile experimental platform for the research of different system construction and control algorithm. This paper adopts LMS algorithm as an adaptive filter controller，which can automatically compensate for the effect on noise control caused by the changes of the background noise，environment factors and electrical or acoustical parameters. It can accomplish notable broad-band noise attention. The results of experiments show that under the condition of two secondary sound resources arranged within free space，the maximum attention level obtained by the system is more than 40dB to the single frequency and barrow-band random noise from 50 to 400Hz.

Abstract:By analyzing the characteristics of the large-scale complicated equipment system，we present the systematical structure and the diagnostic strategy of the multi-object and multi-level condition monitoring and diagnosis. The realization technology of the system is also discussed.

Abstract:This paper deals with recognition of target and its attached decoy. Bayesian data fusion method is used for recognition. Its principles,fusion model，and recognition result are described in this paper. The result shows that it is an effective and robust method for the recognition of target and decoy.

Abstract:It is very difficult to design an effective detector to spot ship targets. In this paper，a new method of detection based on fractal characteristics of sea-surface scattering is proposed. By comparing the difference in the fractal dimension between the sea c1utter and the echoes from a target，an effective detection of the radar ship targets can be realized. In order to test this method，we use the real radar returns of ship targets for detection and a better result has been achieved.

Abstract:The properties of the beam scan of a novel electrical scanning-tracking antenna are analysed in this paper. This is a parabolic antenna with a feed，which is composed of four PIN diods installed in two layers dual-ridge rectangular waveguides. The suitable ratio of modes is obtained from optimum procedures for parameters. Some satis-factory identical results of calculation and experiment are obtained，which shows that thus designed antenna has almost reached perfection.

Abstract:VHDL is a standard language for the design and description of digital circuits. As a case study several array processors fullfilling the sort algorithm designed in VDHL are discussed here. Their concise VHDL description can be synthesized into FP-GA or ASIC gate-level netlist. Practice shows that applying VHDL can greatly improve the efficiency of digital system design.

Abstract:FPGA is an advanced ASIC technology developed in the 1980s'. Owing to its field programmable features，FPGA is peculiarly suitable for implementation of multitask systems that need dynamically changing structure. A high speed acquisition and processing multitask system is proposed in this paper. The bus structure in this system is realized by FPGA. The system has greatly reduced volume，improved flexibility and reliability.

Abstract:OSAS (Obstructive Sleep Apnea Syndrome) is a common disease，but its accurate diagnosis needs some extra instruments. This paper puts forward the principle of computer-based automatic diagnosis for OSAS，constructs the mathematical model，and designs the diagnostic algorithm for“GKD-405A six_channel Sleep Monitor”，and finally introduces its clinical application.

Abstract:YH-F2 is a simulation computer of high-speed，high-accuracy and powerfull simulation ability. In simulation field，YH-F2's performance is higher than some supercomputer's. YH-F2 widely adoptes synchronous and parallel process technology，which is one of important reasons why YH-F2 of high speed and high efficiency. This paper introduces synchronous and parallel process technology adopted in YH-F2. The introduction is consists of several parts: architecture，synchronous and broadcast buses，interprocessor communications，processor internal，I/O systems，compiler etc.

Abstract:The scan ring diagnostic techniques are advanced and popular in the world. In this paper，the principles and method of scan ring diagnosis are presented，and the designs of hardware and software for scan ring diagnosis are discussed. Not only are the efficiency and ability analysed，but aslo an accelerating approach is proposed.

Abstract:The problem solving environment aims at helping the users to the，greatest extent. ELLPACK is a problem solving environment for solving elliptic partial differential equation. This paper analyses its mechanism and adds a linear equation recognizer to it.

Abstract:In this paper，a best computation format of a recurrence function is given when the function is recoverable or irrecoverable. Its application to the smoothing，fattening of the images and the layout analyses of the document image is discussed too.

Abstract:The paper gives a brief account of theoretical basis of the system of inference and maintenance，and the technology for implementation，of FKMS approximate knowledge base we implemented in PROLOG at the SUN work station. This paper also evaluates FKMS system.

Abstract:This essay presents an algorithm for the double-words floating point multiplication used in computer，and discusses the computation formula，the steps of computing and error estimation. The principle of this algorithm can be used in the floating point multiplication of any length of words in general computer system.

Abstract:This paper is devoted to establishing the Chebyshev pseudospectral domain decomposition scheme for elliptic equation，both one-dimensional and two-dimensional problems are discussed. The equivalent generalized variational forms for the Chebyshev pseudospectral domain decomposition scheme are given.

Abstract:Through researching into the generalized problem of Hanoi tower，this paper has revealed the optimal removing sequence of the circle plates during its solving procedure. And through analyzing the algorithm complexity，this paper has put forward an optimal solving algorithm and drawn into an optimal general solution.

Abstract:Measuring noise in aircraft tracking and measuring can't be observed and hence it must be pre-processed to obtain information about measuring noise. In this paper，we conduct a systematic study of the two models that are applied extensively and present theoretic bases for processing method.

Abstract:In this paper，using the method of Nelson's nearly elementary process，we obtain a nonstandard filtering formula of a nearly elementary process，which is equivalent to a standard filtering formula of a continuous parameter process，and thereby we obtain Kalman's filtering formula of a continuous parameter process.

Abstract:Based upon the basic viewpoints of A. Einstein on quantum mechanics and de Broglie's double wave functions principle，the wave-particle postulate and the wave-particle physical quantities postulate are presented. The wave-particle function as a free wave packet is obtained in which is involved a generalized δ-function factor as representations for the center of the extensive wave phenomena. The free wave packet is steady，not spreading with time, and is the real representation for the free particle. The wave function ψ describes the statistical ensemble. Combining the wave function with the wave-particle function gives the complete description for the single free particle.

Abstract:Spreading sequences are one of the most important component for SS communication. This paper discusses the construction method,sequences properties and application field in SS communication of three families of algebraic nonlinear spreading sequences.

Abstract:The vibrational spectra of impurity atoms in InSb crystal has been calculated with the recursion method according to the experimental result of the phonon dispersion relation for InSb. The impurity atoms are Al，Ca，As and p，respectively. In our model，6209 atoms are taken into account.