Table of Content

31 December 1992, Volume 13 Issue 4

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Paper

A Study on the Lateral Dynamical Properties of Tires

Sun Fengchun、 Zheng Muqiao

1992, 13(4):  1-8.  doi:10.3969/j.issn.1000-1093.1992.04.001

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In this paper , a model for tires， namely a Band — Belt — Tread model， is proposed to simulate the lateral dynamical properties of the tire, The model can also be treated as a subsystem and incorporated into the system of a vehicle as a whole for dynamic analysis. It is analyzed under time-varying side slip angle and constant wheel load* The model is very useful in the study of driving properties for military vehicles with pneumatic tires.

A Method of Calculation for the Base Drag of Base Bled Prpjectiles

Liu Yafei、Ding Zesheng

1992, 13(4):  9-14.  doi:10.3969/j.issn.1000-1093.1992.04.002

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The paper presents an engineering calculation method for the base drag of base bled projectiles based on the base drag reduction characteristics due to base burning of fucl- rich solid fuels* Agreement of calculated results with the exparimentai data from firing proved to be satisfactory.

Projectile’s Motion in an Increasing Twist Rifled Bore

Rui Xiaoting、Luyunqi

1992, 13(4):  15-20.  doi:10.3969/j.issn.1000-1093.1992.04.003

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The dynamic model and the differential equations of an unsymmetrical projectile traveling in a flexible，increasing twist rifled bore gun tube are developed in this paper, The equations can be used for tlie study of any case of a projectile traveling in the bore,L e. , when the bourrelet keeps in contact with， or not in contact with，or impacts with the bore. The patterns of motion of a projectile traveling in an ideal increasing twist rifled bore are studied and compared with that of a projectile traveling in an uniform twist- rifled bore gun tube. Some conclusions have been reached.

An Experimental Study on the Rapid Determination of Cheinical Stability of Nitroglycerin by a Chemiluminescence Nitrogen Oxides Analyser

Lin xinyun

1992, 13(4):  21-27.  doi:10.3969/j.issn.1000-1093.1992.04.004

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The thermal characteristics of nitroglycerin at 82 °C were studied by means of a chemiluminescence nitrogen oxides analyser. The results show that the acceptable criterion for chemical stability of nitroglycerin is a concentration of NOx of less than or equal to 85ppb/82°C，llmin.

The GEVT Mixed Method for the Calculation of FaIse-Alarm Probability of Radar Detectors

Shen Fenglin

1992, 13(4):  28-33.  doi:10.3969/j.issn.1000-1093.1992.04.005

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Difficulties of the Analytical Method and Simulation Method when used for the calculation of performance of radar detectors are pointed out. The major problem of the Monte-Carlo Simulation lies in the calculation of false-alarm probability of radar detectors. Important sampling theory is sometimes helpful for resolving this problem, but it is not always successful. A mixed method is presented in this paper, and it is point out that this GEVT Mixed Method is appropriate for solving the above mentioned problem. Merits of the GEVT Mixed Method is analyzed and the necessary condition for using it pointed out.

A Study of the Effectiveness of Rockets with Sub-Missiles

Li Fengchang

1992, 13(4):  34-38.  doi:10.3969/j.issn.1000-1093.1992.04.006

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This paper studies the effectiveness of fire when the rocket weapon fires rockets carrying sub- missiles causing personnel damage, The method of equivalent rocket is proposed, A model having four groups of fire error is transformed into a model having two groups of fire error by the method of average dispersion centre, A formula to calculate the protmbUity of personnel damage is provided

A Study on the Recognition of Rocket Exhaust Blast Loads

Pan Hongxia、Zhenghaiqi

1992, 13(4):  39-44.  doi:10.3969/j.issn.1000-1093.1992.04.007

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In this paper, we deduce the basic reiationsliip for the recognition of rocket exhaust blast loads. After taking a series of steps of improving precision，we obtain the ideal results of the modeling distinguishing of the loads。

An Approximate Kinematical Method of Solving the Shakedown Problems

Du Sentian

1992, 13(4):  45-48.  doi:10.3969/j.issn.1000-1093.1992.04.008

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An approximate kinematical method for solving the shakedown problems is presented in this paper. The scheme adopted is firstly to assume a kinematically admissible plastic strain rate cycle* Then，the actual collapse load factor is estimated according to some relevant formulae of the kinematical shakedown theorem. Application of the approximate kinematical method is exemplified using a continuous two-span beam applied with cyclic load.

The Post-Buckling Equilibrium Behavior of a Lined Cylindrical Shell Under Thermal Stress

Huang Yijun

1992, 13(4):  49-57.  doi:10.3969/j.issn.1000-1093.1992.04.009

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The paper presents a theoretical analysis and approximate solution for the post- buckling equilibrium behavior of a lined thin cylindrical shell under thermal stress in the elastic field and has obtained some important conclusions.

Application of Maggiˊs Equations in the Dynamic Analysis of Constrained Mechanical Systems

Yuan Shijie、LǚZheqin

1992, 13(4):  58-64.  doi:10.3969/j.issn.1000-1093.1992.04.010

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This paper demonstrates that the Maggiˊs equations in analytical dynamics are the foundation of the various dimension- reduction methods for the dynamic modelling of constrained mechanical systems , and developes Maggiˊs dynamic equations with embedded constraints for constrained mechanical systems making use of the genearlized coordinates partitioning methcKi and the singular value decomposition method respectively.

Boundary- Element Method and Application of the Weight-Function Method in the Calculation of Stress Intensity Factors of an Autofrettaged Gun Barrel with a Surface Crack

Wang zhiqun、Zha Zichu、He Jinquan

1992, 13(4):  65-75.  doi:10.3969/j.issn.1000-1093.1992.04.011

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Boundary element method for calculating the stress intensity factors of an autofrettaged gun barrel with a surface crack is studied. Suggestions on the locations and the optimum size of singular isoparametric elements are presented. Formulas for the calculation of stress intensity factor of a surface crack in the autofrettaged gun barrel are developed using a weight function method. These formulas are suitable for use with various gun barrels made of different materials, and of different amounts of overstrain depth of crack and size. A computer program has been worked out and given

Simulative Identification of Hydraulic Parameters of Submarine Moving Body

Ding Wenjing、 Luo Renfan、Dong lin、Wang Shugui

1992, 13(4):  76-83.  doi:10.3969/j.issn.1000-1093.1992.04.012

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Simulative identification of the hydraulic parameter of a submarine moving body is studied by the maximum likelihood method. Nonlinear differential equations describing the longitudinal motion of the submarine moving body are shown, Identifiability of system parameters is demonstrated by linear perturbation equations. According to the selected scheme an equation is constituted for the observation. Identification algorithm for the nonlinear dynamic system is deduced following the maximum likelihood principle* Hydraulic parameters of the submarine moving body are identified utilizing the simulative observe data. Research results show that hydraulic parameters of the submarine moving body can be identified by initial responses.

Experimental Techniques and Analysis

A Study on the Process and Mechanisms of Laser Machining of High-Performance Composites

Pang Siqin、 Liu Weicheng

1992, 13(4):  84-91.  doi:10.3969/j.issn.1000-1093.1992.04.013

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Based on the experimental results of pulsed Nd : YAG laser machining of A1203 +TiC composite ceramics and carbon fibre composite, this paper studies the characteristics of the process and the mechanisms of laser machining of the high-performance composites. It is found out that there exist optimal values in the choice of laser pulse parameters, SEM analysis exposes the mechanisms of removal and some special micro-defects.