Table of Content

31 December 2002, Volume 23 Issue 4

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Paper

Dynamic Analysis of Mobile Weapon Systems with Clearances: Part Ⅲ System Simulation

1:Li Haiyang;2:Wu Delong， Zhang Yong

2002, 23(4):  433-437.  doi:10.3969/j.issn.1000-1093.2002.04.001

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A general method is derived for the dynamic analysis of multi-body systems with clearance by applying the clearance models gained in Part II . Elementary simulations are performed using this method on the dynamic characteristics in the launching phase of mobile missile, which verify the impact model and the clearance model established m Part Ⅰ and Part II . The effects of clearances on the dynamic behavior of missile are also discussed. In addition，the system topological structure changes during the launching phase， thus the method in tins paper provides a solution for this kind of problems.

A Reliability Model of Man- Machine System Based on Dependence Among Stimuli, Organisms and Actions

1:Wei Gang, Yang Yuhang;2:Wang Wuhong

2002, 23(4):  438-441.  doi:10.3969/j.issn.1000-1093.2002.04.002

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High reliability and safety are the main criteria for a successful design of man-machine sys?tems (MMS). Operator’s dependence is defined through response(R), as a function of stimulus (S) and organism (U). Based on the identification of operator’s key performance shaping factors, an operator be?haviour shaping model is proposed，incorporating an analysis of the ability of self-adaptation or self-study of the operator, that is able to correct errors from a critical situation. An expression for operator9 s reliability as some parameters is derived from the operator behavior shaping model, and such parameters are obtained from data of accidents or faults in MMS. An application of the reliability model to man-machine systems with vehicle is given as a sample case. The relationship between human reliability and operator’s depen?dence is discussed m detail.

Combined Lagrangian Multiplier and Symmetric Penalty Function FEA for Dynamic Contact Problems of Solid Tires

Yu Libiao, Zheng Muqiao

2002, 23(4):  442-445.  doi:10.3969/j.issn.1000-1093.2002.04.003

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The dynamic contact problem is a new subject in contact mechanics for tires. A new approach that combines Lagrangian multiplier and the penalty function method was put forward in this paper. Based on the combined method, a dynamic contact FEA model of solid tire was set up and analyzed. Consequently the contact-stress field and deformation shape were obtained. The results prove that this method can not only analyze dynamic contact problems of solid tire effectively but are also of value in optimizing structures in selecting materials and predicting the fatigue life for solid tires.

Dynamic Parameter Matching in a Caseless Rifle

Wang Yongjuan, Zeng Weisheng, Xu Cheng

2002, 23(4):  446-448.  doi:10.3969/j.issn.1000-1093.2002.04.004

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Through theoretical modelling and numerical simulation, the dynamic matching relationship is studied on two types of automatic action systems of caseless rifles. The laws of influence of parameters are derived concerning the rifle ’s performance when firing at bursts of three，and a comparison of the two types of automatic action systems is made.

general Equations of Planar Dynamics for Automatic Mechanisms of Guns

Wang Baoyuan, Liang Shirui, Jiao Minggang,Zhou Faming,Ning Bianfang

2002, 23(4):  449-452.  doi:10.3969/j.issn.1000-1093.2002.04.005

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This paper studies the automatic mechanisms in guns. The constraint equations of typical kinematic joints and the equations of motion of component parts in a plane are developed by the systematic modelling method. The algebraic-differential equations of planar dynamics of the automatic mechanisms of guns are formed.The method and equations of motion are verified by many examples.

Analysis on the Effect of Pressure Pulse Widths on the Quasi-Dynamic Calibration Table of Pressure-Measuring Copper Ball

1：Kong Deren, Zhu Mingwu,Zhang Shuning;2: Liu Deqiu

2002, 23(4):  453-456.  doi:10.3969/j.issn.1000-1093.2002.04.006

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The meaning of quasi-dynamic calibration of copper balls is presented and factors affecting er?rors on working out the table with quasi-dynamic calibration is analyzed. Calibration experiments covering 9802 copper balls have been carried out on the dropper-hammer dynamic pressure calibration device by- changing calibration pressure’s pulse-width. The model of relationship between heights of copper balls pressed versus the maximum pressure,as well as the heights versus pressure and pressure pulse-width were established by means of regression analysis. Based on this relationship model, with the changes in pressure pulse-width ,the variation of errors when referring to calibration table of pressure-measuring copper balls was analyzed. The scope of application of the quasi-dynamic calibration table for copper balls is expounded.

Dynamic Analysis of a Self-Propelled Gun Firing on the Move

1：Feng Changgen；2：Wen Bo, Li Caibo

2002, 23(4):  457-461.  doi:10.3969/j.issn.1000-1093.2002.04.007

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Based on the structural and movement properties of the self-propelled gun, digital simulation of firing on the move of a self-propelled gun is systematically introduced. By analyzing the forces acting on the gun, a complex multi-body system model of the self-propelled gun is extablished by the Kane-Huston method, in which the constraints on the wheels and the effects of the chain are described in detail. The fir?ing forces are calculated by use of interior ballistics theory and analysis of automatic systems and the force caused by the running of the gun and the roughness of the road are also calculated. By applying these forces to the multi-body model, the response of the gun is solved. Then the initial perturbation of the projectiles can be calculated taking into consideration vibration of the muzzles，and finally the firing accuracy is solved and discussed.

Interior Ballistic Calculations of an Under Water Gun at Various Depths

1：Chen Jie；2：Wang Changming, Di Changan,Liu Guangliao

2002, 23(4):  462-464.  doi:10.3969/j.issn.1000-1093.2002.04.008

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The influence of water depth on the maximum pressure in the bore and the initial velocity of underwater guns are discussed. I he idea that the effect of water depth can be converted into a secondary work coefncient is put forward，from which a method for calculating the interior ballistics of different water depths is given. Experimental data have shown the feasibility of this method.

Calculation of Reliability of Armor-Piercing Projectiles Applying Combined Advanced Mean Value Method jointly with the Finite Element Method

Chang Liangming,Zheng Minda

2002, 23(4):  465-468.  doi:10.3969/j.issn.1000-1093.2002.04.009

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Advanced mean value method is an efficient method in reliability analysis under the condition ?i implicit limited state functions. Combined with the finite element method, the reliability of armor pierc?ing fin stabilized discarding sabot projectiles having large slenderness ratio was calculated. Randomness of the bore pressure, the mechanical property of materials, and the tolerances between the sabot and core are all taken into consideration, so that appropriate results are obtained. Furthermore, the suggestions on im?provements in its strength and reliability are proposed.

Analysis and Control for the Spread in Destruction Time of Fuze Centrifugal Mechanisms

1:Zhang Dezhi, Wu Yubin, Wang Jian, Zhang Jian;2:Ao Qihong

2002, 23(4):  469-471.  doi:10.3969/j.issn.1000-1093.2002.04.010

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Causes of spread in the destruction time of fuze centrifugal mechanisms are pointed out. De?struction index of 45° elevation is considered and analysed. An easy operating and calculating method for the calculation of superior/inferior limit of destruction time is advanced.

A Study on the Preparation Technology of Nanometer Ultra-Fine HMX Particle

1:Zhang Xiaoning ,Ma Wanyun;2:Xu Gengguang, He Dechang

2002, 23(4):  472-475.  doi:10.3969/j.issn.1000-1093.2002.04.011

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Nanometer size ultra-fine HMX particles had been prepared successfully using the impinging streams method and micro-emulsion control technique. Experimental results showed that the Zeta potential plays an important role in the dispersion of HMX and the separation of UFHMX. Spheric nanometer HMX particles in narrow distribution range could be obtained under the condition of 150MPa pressure and 1000 ni/s impact velocity. Effective average particle diameter of the sample obtained under that condition amounted to 184.4nm, with a minimum diameter of 12. 4nm and a maximum diameter of 465. 7nm, the specific surface area being 28. 42m2 /g.

The Standard Head” for sizing Military Helmet Based on computerized Tomography and the Headform Sizing Algorithm

Chen Xiao, Shi MeiWu, Zhou Hong, Wang Xiting,Zhou Guotai

2002, 23(4):  476-480.  doi:10.3969/j.issn.1000-1093.2002.04.012

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In order to correctly optimize the shape and the attachments of modern helmets and protective masks, the three dimensional characteristics and curvature information of the soldiers’ head-face must be obtained because the existing one dimensional standards can no longer meet the requirements. Computerized tomography (CT) scan combined with computer graphic treatment is a new field in anthropometry, and is relied upon in measuring headforms in this paper. Due to extreme varieties in the sizes and shapes and dif?ferent alignment orientations of heads, it is not convenient in the design of helmets. Consequently, a new concept standard head” and the sizing algorithm of reference headforms are put forward, and an aluminum model is made. They can help to size helmets and improve the ergonomic aspects in their shape.

Target Image Trace Based on Satisfactory Filter

Liu Shiqian, Guo Zhi, Wang Yuangang, Cheng Xungquan

2002, 23(4):  481-484.  doi:10.3969/j.issn.1000-1093.2002.04.013

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For image target trace under complex circumstances with a desired circular pole index and a steady variance of I liter error index, the idea of satisfactory control and estimation can be applied[1]. With the LMI method，the robust satisfactory estimation of a stochastic trace system is turned to an optimization problem subject to a set of LMIs，and an effective method of design is presented to satisfactory estimation of the trace system. Satisfactory trace windows can be designed and an algorithm of satisfactory filter deduced through this method, and then use the algorithm for a track trace test of a missile image. Difference be?tween satisfactory filter and Kalman filter can be visualized by simulation tests and analysis to check the rel?evant results.

LMI Design of Satisfactory PID Controller in a Laser Oriented Servo System

1:Sheng Andong, Lü Taiquan,Guo Zhi,2:Yin Kaibao

2002, 23(4):  485-488.  doi:10.3969/j.issn.1000-1093.2002.04.014

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By means of a laser oriented servo system with the function of image processing，operational difficulties in the Target COMERO can be greatly reduced when an operator is tracking a dynamic flying target，and the laser echo ratio can be improved. As is different from the classical matrix decomposition ap?proach ，linear marix inequality method is used to solve the problem of design of satisfactory PID controllers in the laser oriented servo system. Beginning with the consistency of constraint indices, the range of the steady output variance, consistent with the constraint of circle-poles, is presented. Then a method is pro?vided to get parameters of PID controller when the constraint indices are consistent. Validity of the method is testified by results of the test in a proving ground.

Radar Fuse Using Combined Random Pulse Modulation and Random Binary Phase Coded Modulation signals

Zhu Xiaohua ,Wang Jianxin, Liu Zhong, Shi Xiangquan

2002, 23(4):  489-492.  doi:10.3969/j.issn.1000-1093.2002.04.015

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This paper proposes a radar fuse system using random pulse position modulation signals in combination with random binary phase coded modulation. Mathematical model of the fuse signal is defined ana its average ambiguity function is presented. The fuse system principle is then given and its anti-inter?ference performance analyzed. The results show that the proposed system has good range and velocity mea?surement performances, very low probability of interception, and is excellent in anti interference.

A Study on Intelligent Decision Support System for the Scheme Eyaluation of Weapon Systems

Yu Cungui, Wu Ping ,Yan Xiangmin

2002, 23(4):  493-496.  doi:10.3969/j.issn.1000-1093.2002.04.016

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Aimed at the scheme evaluation during a weapon system design, the paper studies an intelli?gent decision support system of the scheme evaluation for the weapon system. The pattern of multiple at?tribute decision-making based on a blackboard model is made use of, besides integrated methods of existing scheme evaluation for the weapon system. It describes the decision support system from its architecture, functional structure, decision model and working mechanism. An example is analyzed for the decision sup?port system. It is seen that the system has its flexibility and self-adaptability. Results of analysis can pro?vide rational and scientific information for complicated scheme design of weapon systems.

Design for a Wireless Channel Receiver

1:Fei Yuanchun, Xu Xuexin;2: Chen Shizvei

2002, 23(4):  497-499.  doi:10.3969/j.issn.1000-1093.2002.04.017

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Project wireless channel receiver aimed at is a part of a mobile communication system. A num?ber of monolithic microwave integrated circuits(MMIC) and surface mount components are used. Detailed analysis and design of the system scheme are given. Test results of the system circuits are also introduced.

Method of Ship Detection in Oceanic Sar Image Based on Wavelet Transforms

1:Luo Qiang, Yang Wanghai;2:Luo Li,He Honghun;3:Ren Qingli

2002, 23(4):  500-503.  doi:10.3969/j.issn.1000-1093.2002.04.018

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Characters of ships and their background in ocean SAR imagery were analyzed and a method of ship detection in oceanic SAR image was proposed based on wavelet transforms. Experimental results show that the proposed method is practical and efficient.

Performance Evaluation of Optoelectronic Imaging System Based on a Human Visual Model

Zhou Yan, Jin Weiqi, Liu Guangrong, Wang Lingxue,He Yuqing

2002, 23(4):  504-507.  doi:10.3969/j.issn.1000-1093.2002.04.019

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Performance evaluation of optoelectronic imaging system is investigated in theory on the basis of human vision experiments. The effects of field angle, performance of imaging system and angular ampli?fication on the optimal matching existing between optoelectronic imaging system and human eye are ana?lyzed, and a quantitative description for such items as the optimal observation range of TV type imaging system and the optimal focal length of the ocular lens in static type are realized. The results derived are con?sistent with the reality.

Elastic-Plastic Dynamic Buckling of Cylindrical Shells under Axial Non-Uniform Impact Loading

Liu Li, Liu Tuguang, Zhang Tao,Li Tianyun

2002, 23(4):  508-512.  doi:10.3969/j.issn.1000-1093.2002.04.020

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The elastic-plastic dynamic buckling of cylindrical shells under axial non-uniform impact load?ing is discussed. The basic equations of structure are derived from the Hamilton variational principle, and the constitution of materials utilizes the increment theory. Increment numerical method is used to solve the kinetic equations. The deformation model and critical dynamic buckling loads of cylindrical shells under axi?al non-uniform impact loading are discussed and compared with results of the cylindrical shells under static axial eccentric loads and axial axisymmetric impact.

Software Model and the Realization of Automatic Parameter Design of a Solid Propellant Rocket Missile

Chen Jun, Wang Zhengshi, Dong Shiyan

2002, 23(4):  513-516.  doi:10.3969/j.issn.1000-1093.2002.04.021

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Mathematical model and the design process in the automatic parameter design of a solid pro?pellant rocket motor，as well as the data transmission Detween parameter design and drawing generating modules are analyzed. The automatic design software involves in it some important modules such as mass prediction，choice of propellants，prediction of mass ratio，grain design，external ballistic fitting，internal ballistics, etc. Each module works with each other to complete all tasks in rocket motor design and correc?tion from iteration calculations. Based on the sustainer motors, the parameter design software is pro?grammed. Through the design of the sustainer motor and scheme argument using the software, it is seen that the software frees the designers from complicated work of calculation and enhances the design efficien?cy.

Investigation on the Bonding Strength and Other Properties between Different Substrates and Composite Coatings

Jing Yang, Pang Siqin, Zhou Lanying, Zhang Xueheng

2002, 23(4):  517-520.  doi:10.3969/j.issn.1000-1093.2002.04.022

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Through tribological tests of TiN-MoS2 /TiN composite coatings on different substrates and cutting tools, influence of different substrates on the bonding strength, structure of coatings and other properties were investigated. Hydrogen disease in しu samples and formation of hydrocarbon in steel # 45 samples are liable to result in failures of deposition. Due to the difference in material and rigidity, the bond?ing strengh between coatings and sample and other properties of lCrl8Ni9Ti were superior to that of alu?minum alloy. Meanwhile, with the same materials, tribological properties were obviously improved when rigidity of sample became heightened.

Theory and Method for the Multi-Point Forming of 3D Sheet Metal Parts

Cui Xiangji, Cai Zhongyi, Li Mingzhe

2002, 23(4):  521-524.  doi:10.3969/j.issn.1000-1093.2002.04.023

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Multi-Point Flexible Forming (MPF) is an advanced processing technique for 3D sheet metal parts. The theory and method on the blank design, determination of forming path and transition area de?sign of sectional forming in MPF are introduced. Initial blanks for ellipsoidal objective surface and an irreg?ular surface were calculated and the optimum forming path for a saddle objective surface was designed by the presented methods.

A Study on the Emulation of Orthogonal Turn-Milling Chips

Jiang Zenghui, Jia Chunde

2002, 23(4):  525-528.  doi:10.3969/j.issn.1000-1093.2002.04.024

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The vector equation of orthogonal turn-milling movement is introduced briefly. The mathe?matical model of emulation of orthogonal turn-milling chips is given. The principle of computer emulation of chips is expounded，and the form of chips is emulated under different parameters of processing. Influence of different parameters on the orthogonal turn-milling cmp formation is analyzed. An eccentricity of | e | = r 一 lns is seen to be suitable for orthogonal turn-milling.

Short Papers

Diagnostic Technique and System for the Examination of Adhesive Quality of Combustible Cartridge Cases

Zhang Jilong, Wang Junyuan

2002, 23(4):  529-532.  doi:10.3969/j.issn.1000-1093.2002.04.025

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Diagnostic technique and system for the examination of the adhesive quality of combustible cartridge cases are studied. Based on Bayes criterion，the classificatory function is formulated and the results of classification are given.

Adaptive Fuzzy Control of High Accuracy Airborne Optical- electronic Tracking System

Lu Guangshan, Jiang Changsheng, Geng Yanluo

2002, 23(4):  533-535.  doi:10.3969/j.issn.1000-1093.2002.04.026

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The key in hitting the target precisely by an airborne laser guidance weapon lies in that the pencil of laser rays can irradiate on the target stably and precisely, which then guides the motion of the weapon. In the realization of this goal, so that the pencil of laser rays can track the motion of target pre?cisely and stably，under the condition of airborne motion and vibration besides the target，s motion，the laser beam is stabilized by the system of gyroscope stabilization platform. In this paper, a discussion is de?voted to the gyroscope stabilization platform. It is demonstrated by digital simulation that the method of de?sign discussed in this paper is effective and useful.

Experimental Techniques and Analysis

A Study of Pulsed Forming Network with Explosion Closing Switch

Dong Jiannian, Li Hongzhi, Li Baoming

2002, 23(4):  536-540.  doi:10.3969/j.issn.1000-1093.2002.04.027

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This paper studies the design and testing of an explosion operated compound closing switch. The compound closing switch is used as the output switch of discharge circuit and the short-circuit switch of crowbarring capacitor banks at the same time. On the basis of analysis and experiment to the circuit and character of pulsed forming network (PFN)，PFN model and pulsed power supply were established. The system has been successfully usea in electrothermal chemical launchers under different loads.

A Study on a simulation Experiment System for Projectile’s Premature Explosion upon Launching

Wang Shiying ,Wang Shuping,Hu Huanxing

2002, 23(4):  541-545.  doi:10.3969/j.issn.1000-1093.2002.04.028

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Based on a study of an explosive charge launching in the gun, a device and the corresponding projectile that can simulate the mechanical environment of the cannon upon launching have been estab-lishe. The closeness between the simulation projectile’s launching and that of the real projectile were stud-ied，showing that the simulation test system is feasible and can be used to study tne explosive charge in its premature explosion. Finally, the simulation experiment system is set up.

Research Notes

Engineering Algorithm for a New Type of Protective Armor Disturbing Jet Penetration

1:Li Yanqing, Gao Fei, Wang Changxing;2:Gao Junyuan

2002, 23(4):  546-550.  doi:10.3969/j.issn.1000-1093.2002.04.029

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On the basis of a study on the mechanism of disturbing jet, mechanical model and engineering algorithm for a new type of protective armor disturbing the jet is put forward. Based on the basic hypothe?sis, the shock wave pressure emerging in the medium after the jet punctures the armor unit is estimated, while deformation of the armor unit plate and the jet are calculated. The calculated results accord well with the experimental results.

Modelling and Digital- Simulation of a Human-Weapon System

Wang Yaping, Xu Cheng, Guo Kai

2002, 23(4):  551-554.  doi:10.3969/j.issn.1000-1093.2002.04.030

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A dynamical model of the human-gun system with twelve rigid bodies and thirty-two decrees of freedom is set up，based on the biomechanical features of the human body structure and the features of human-gun system. The dynamical motion of systems consisting of the human being and a type 56-7.62mm sub-machine gun is simulated. The forces on human body interaction points and joints are analyzed. A soft?ware tool for the simulation of human-gun system is developed.

A Novel Process for the Refining of HMX

Li Qiaoling, Ye Yupeng

2002, 23(4):  555-557.  doi:10.3969/j.issn.1000-1093.2002.04.031

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This paper describes a new method for refining HMX. To the diluted nitrating medium, waste acid is added. The resultant mixture is heated to a given temperature and stirred at the temperature for a given period of time. β-HMX is then obtained by controlling the crystallization process. The yield for the crystallization step attains up to 90% . The by-product (RDX) can be recovered and the waste acid can be recycled. The production cost of the process can be 20% lower than the regular mixed solvent process.

Display System for a Small Arms Optoelectronic Sight

1:Zhang Jian;2:Wang Xuejing, Song Jianzhong

2002, 23(4):  558-560.  doi:10.3969/j.issn.1000-1093.2002.04.032

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The structure and theory of the display system for a new type of small arms optoelectronic sight is introduced. The system uses the synchronous serial port of a digital signal processor, which can produce dot matrix signal of video characters at a speed of 1OMHz. At the same time, the programmable logic device generates the reticles. The reticle and the video characters are displayed on the monitor simulta- neously. This system is characterized by its simple structure, small size and weight, needing fewer re?sources and simplicity in aiming. The display system has been applied in practice.

An Analysis on the Mechanical Characteristics of Multi-Layered Tubes

1：Zhang Yue, Zhao Xifang；2：Fan Xinmin

2002, 23(4):  561-564.  doi:10.3969/j.issn.1000-1093.2002.04.033

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With the help of finite element method, the mechanical parameters in the performance of mul?ti-layered tube were analysed. Stress and strength analysis, as well as the dynamic characteristics were studied. The results reveal that higher ratios of strength and rigidity are achieved in a multi-layered tube. A theoretical basis is provided for engineering applications of multi-layered tubes.

Numerical Simulation of the Speed neld and Temperature Field in Supersonic Air-Fuel Spraying

Wang Zhijian, Tian Xinli, Hu Zhongxiang

2002, 23(4):  565-568.  doi:10.3969/j.issn.1000-1093.2002.04.034

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On the basis of numerical simulation model for an improved rocket nozzle,numerical simulation for the speed field and temperature field of the flame and particles of a supersonic air-fuel spraying gun int tube is successfully performed. The rules of change for the speed field and temperature field of flame and particles in supersonic air-fuel spraying during the spraying process are made known. Stuctural parameters in the nozzle and acceleration tube of the gun and effects of particle size in the speed field and temperature field are discussed. The foundation on improving the hearing and acceleration property of spray particles is thus established.