Abstract:There are some of multiple-sensor methods used for on-line measurement of the straightness of precision machine tool and machined workpiece， But，all of these methods are only used for long workpiece measurement. The OEST method proposed in this paper is a new one that can be used for short workpiece measurement. 1t is based on the analysis of frequency domain and optimum search in time domain. It can overcome the mismatch problem in boundary area caused by shift in frequency domain. And，computer simulation and experiment results prove that this method is easy and efficient.

Abstract:Some theory and methods in ultraprecision machining are presented. Error separation and error compensatory control of roundness，straightness and cylindricity are included. And nonlinear modeling of micro-driven equipment and micro-displacement measurement are also comprised. Finally some main achievements in scientific research are briefly introduced.

Abstract:On the synthesis of planetary gear trains，it is very important to know the relation between the number of planets and the limiting ratio considering the three geometric constraints: the same central, assembly and abjacent conditions，this paper has derived the expression of the number of planets and the limiting ratio via uniform symbols which is suitable for all the six type of planetary gear trains，and obtained the formula to evaluate the limiting ratio.

Abstract:In this paper the basic concepts and basic research contents of the machine tool intelligent machining are approached. The basic structure of the machine tool intelligent machining system is proposed and the basic functions and effects of different model are also discussed in the paper.

Abstract:The dinstinction of sine frequency-sweep vibration controlled by current minicomputer is almost all control fuaction, such as producing and modifing of driving signal, sampling and analysing of responsing signal, transfer function calculation etc., being worked by computer software. This paper mainly deals with software design principle of the functions discribed above, and shows relevant experiment results.

Abstract:A method of controlling LGV through real time pose detection is proposed in this paper. That is to deduce first LGV's instant pose (indicated by angle deviation α and distance deviation D) from the information from the laser receiver，then control the two driving wheels' speed. The experiment results in new prototype indicate that the above method improves LGV's travel precision obviously，and is expected to be used in real LGV.

Abstract:The problem of increasing the precision of the step-angle of a step-motor by the fine dividing for the step-motor is studied theoretically in this paper. And by means of transfer function，the dynamic response of the system is studied.Finally，the experiment data of evenness of the step-angle of different numbers of the fine dividing are given.

Abstract:This paper analyses a new photoelectrical method to measure displacement by using hologrophic grating as sensor in theory. The measuring optical system is presented from the practical view and the error is discussed in detail. The method has advantages of simple structure and high precision.

Abstract:In this paper，a 9-DOF (Degree of Freedom) flight dynamic model of controllable parafoil system is presented. Based on this model，the simulation program is developed to aid the study of the gliding performance and dynamic stability for such a system with a parafoil of 40(sqm). Its results are compared with those of 6-DOF model. The stablitity of relative pitch is analysed in detail，and the methods for its improvement are given.

Abstract:A neural network system used for failure detection of a liquid rocket engine (LRE) is described and presented in this paper. The system includes two layers: the first processing layer consists of the winner-take-all (WTA) neural network used for LRE fault diagnosis; the second layer consists of the back-propagation (BP) neural network used for displaying the failure value with the output result of the first layer. In the paper，the failure detection simulation of a liquid rocket engine is given to show great advantages for the failure detection system of the neural network.

Abstract:A method to reduce the model error of Hill equation in large relative distance case is proposed in this paper, by coordinate shifting to reduce the large relative distance of original system to a small one in new system. That is, as the relative distance of interceptor is up to ρ₁ (ρ₁ is defined as a controlled precision parameter, for example, ρ₁=500km), an imaginary moving reference system with its origin at the interceptor's instantanious position is set up, thus the relative motion parameters of the interceptor in original system are translated into those in the new system (obviously the initial relative distance in the new system will be ρ₍₀₎=0). As a result,the large distance problem becomes a small one，the describing precision of Hill equation is improved. This paper provides a theoretical analysis for this method and two examples of computer simulation.

Abstract:Stress analysis of solid propellant motor when temperature varys in storage is presented in this paper. A viscoelastic finite element model based on integral creep constitutive relation is obtained and the method is applid to the thermal stress analysis of viscoelastic beam, cylinder and solid propellant motor.

Abstract:The analysis and computation of chemical non-equilibrium hypersonic wakes are important tasks of reentry aerodynamics. This paper，using axial equations, successfully climinates the axial sigularity in governing equations. Using central differences secret scheme with two rand accuracy，it has solved the parabolic N-S equations and obtained numerical solutions of wakes at 20km and 60km，The results show that the effect of oxygen-electron attachment processes on electron density in far wakes is important.

Abstract:A homomorphic signal processing method is presented for aecurate thickness measurement of thin layers. The method consists in taking the envelope of the inverse Fourier Transform of a corrected logarithnic derivative of the energy spectrum (ES) of the measured signal. Simulations show excellent agreement between estimated and actual values.

Abstract:SE information base is the kernel of an integrated SE environment. This paper presents a graphical software process and product specification language，a framework for SE project support，and the actual efforts at implementing the graphical specification subsystem. From the formal specification of a given SE project，a customized SE information base can be generated，which truly reflects and benefits the SE project.

Abstract:In this paper，the three-parameter {c,h ，α} rotating body model is used to describe the shape of nuclei which can be changed with great amptitude. By Choosing reasonably the shape-dependent single particle potential of nucleon，the Schrodinger equation of single particle motion is solved by means of basic vector expansion method. Using the method of diagonizing the matrix. We calculated the shape-dependent single particle energy levels of nucleon. By analyzing and comparing these calculated results with those obtained by other authors under the same condition，these calculated results are confirmed to be reliable and rational，which can be used to calculate the shell correction and pair correction of deformation potential of great-deformed nuclei.

Abstract:In this paper, we Proposed the reasonability conditions for identical thresholds assumption, which is widely adopted in the design of I.I.D. distributed detection network. This offers the theoretical foundation for the habitually used design procedure.

Abstract:In this paper we discuss the crosscorrelation properties of No sequences. We prove that the crosscorrelation function of No sequences must take on each value of the set { 2ⁿ─1，─2^m─1，─1，2^m─1}，and present the distribution of these crosscorrelation values.

Abstract:Getting low CO₂ Laser power is the key technology in laser-assisted microvascular anastomosis. The technology which is used to get low CO₂ Laser power from the general CO₂ Laser is presented in this paper. Its main advantages are that Laser power on Laser scalper is modifiable, spot size is controllable and energy density on the light spot is uniform. We give the design principle and an example for practical design in this paper.

Abstract:The Hugoniots of porous tungsten carbide (their initial density is respectively 95%，85%，75%, and 65% of that of the solid tungsten carbide)in incompletely and completely densified regimes are calculated. We also obtained the calculated Hugoniout of carbon and silicon carbide infiltrated with 3，5，10wt% tungsten carbide respectively.