Table of Content

30 September 1994, Volume 15 Issue 3

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Paper

Transient Response of Weapon Compoments under Rotation Bending Impact

Fan Lixia

1994, 15(3):  1-7.  doi:10.3969/j.issn.1000-1093.1994.03.001

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A theoretical analysis, and numerical method for rotation bending impact of weapon components is established on the basis of Timoshenko beam equations. Effects of various impact conditions upon the transient response of a beam under rotation bend?ing impact are discussed and the transient response of a type of semi automatic rifle hammer is calculated. Numerical solution shows good agreement with test results.

Principles and Methods of Design for the State Controller of Electronic Fuze Safety Systems

Li Shiyi, Li Jie, Liu Ming jie, et al.

1994, 15(3):  8-12.  doi:10.3969/j.issn.1000-1093.1994.03.002

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Introduces some structural types and functions of state controllers for use on electronic fuze safety systems. Six design principles are proposed for the state con?trollers. Examples of state controller design embodying these design principles are given in this paper.

A New Criterion for the Launching Safety of Explosive Charge

Huang Zheng ping, Zhang Jingyun, Zhang Han ping, et al.

1994, 15(3):  13-17.  doi:10.3969/j.issn.1000-1093.1994.03.003

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A study of explosive safety under launching conditions has been carried out by a m in iset back-shock simulater. It has been recognized that the mechanical power acting on the explosive charge—ignition threshold function can be used as a criterion of launching safety. Based on this criterion and the experimental results, ther-launching safety order of five explosives is given.

Blast Effect on the Follow-Through Charge of a Tandem Warhead

Tu Hou jie, Yun Shouyong, Zhao Hengyang

1994, 15(3):  18-22.  doi:10.3969/j.issn.1000-1093.1994.03.004

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Studies through numerical simulation the effect upon the follow-through charge of the detonation in the forward charge (shaped charge) for a tandem warhead. A simplified numerical model is proposed，adopting the multi-fluid method，when per?fect-gas equation of state having variable index is used for the explosive- The over-pres?sure is obtained along with the total momentum transmitted to the follow-through charge by the blast wave forming by the explosion in the foward charge. Results of cal?culation agree well with the experimental results using Mn-Cu piezoresistance gauges.

The L Principle and Equation of State for Gases under High Temperature and High Pressure

Lu Xiucheng

1994, 15(3):  23-26.  doi:10.3969/j.issn.1000-1093.1994.03.005

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The paper briefly analyses the famous NBS (Haar-Shenker) equation and points out some of its imperfections. Based on the evaluation the L principle and a new equation of state are prensented in this paper. Results from calculation and experiments are in good agreement- It indicates that weaknesses of the NBS equation can be over?come by applying the L principle.

Reaction Rate Equation and Shock Sensitivity for Solid Explosives

Huan Shi, Huang Feng lei, Ding Jing

1994, 15(3):  27-30.  doi:10.3969/j.issn.1000-1093.1994.03.006

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Relationship between the coefficients of reaction rate equation and the shock sensitivity for 8 kinds of solid explosives is studied. It has been found that three of the reaction rate equation coefficients, namely the ignition factor I, the burning growth factor G and the coupling factor X，can each find their correspondence with the respective features of the shock initiation process. Specific groups of the three coeffici?ents ,taken as three shock sensitivity parameters are then defined. They can be used to describe the ignition sensitivity, detonation sensitivity and coupling intensity of solid ex?plosives respectively.

A Theoritical Analysis and Numerical Simulation of the Jet Initiation of TATB

Cao Juzhen, Zhang Tieqiao

1994, 15(3):  31-36.  doi:10.3969/j.issn.1000-1093.1994.03.007

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Jet initiation process of TATB and X02 (mixture of TATB and HMX) explosives is simulated by means of the Lagrange 2D-FPM code, the equation of state of TATB and the chemical rate function being as listed in reference I. The critical crit?eria of jet initiation both for the bare T ATB and when covered with 2mm steel plate are obtained. The study also gives the propagation properties of the detonation wave for TATB and X02 explosives, where as the former has a nonideal propagation, the latter comes near to an ideal one.

On the Mechanism of Crack Formation in High-Burning-Rate Rocket Propellants

Wang Daan, Wang Ningfei, Qin Guangming

1994, 15(3):  37-41.  doi:10.3969/j.issn.1000-1093.1994.03.008

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Through an analysis and calculation of the flow field In a solid rocket mo- tor using high-burning-rate propellant，the authors believe that the pressure difference inside and outside the propellant tube is the cause leading to the crack formation in the propellant. A design method to eliminate the pressure difference is discussed. Ex?perimental results obtained confirm the theoretical analysis.

A Proposed Principle for the Design of Reactive Armor

Liu Beisuo, Wu Cheng, Shen jian

1994, 15(3):  42-47.  doi:10.3969/j.issn.1000-1093.1994.03.009

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The principle proposed in this paper is based on the process that shaped charge jet is cut off into fragments consecutively by the front flying plate. Every fragmental jet is partially cut away twice by two flying plates. The jetpenetration depth into the main armor equals the sum of the penetration depths of the residual jets. Formulas for calculation involve the important factors such as the varying diameters and velocities of the jet，velocities and thicknesses of the flying plates, as well as the streng?th main armor. Thus it is an engineering calculation method that gives the height, iength and thickness of the armor. Results of calculation agree well with the ex?perimental results.

On the Error of an Approximate Formula for Calculating Kill Probability

Xiao Yuanxing

1994, 15(3):  48-52.  doi:10.3969/j.issn.1000-1093.1994.03.010

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In this paper, the error of the appoximate binomial expansion for calculat?ing kill probability is analyzed. A numerical example is given to illustrate the conclu?sions derived. The applicability conditions of the formula are also proposed.

Diffusor Design and Calculation for Supersonic Gasdynamic Lasers

Gu Wenying, Xu Ming chu

1994, 15(3):  53-57.  doi:10.3969/j.issn.1000-1093.1994.03.011

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Due to its stability with respect to variations of inlet Conditions, two- dimensional Long constant-area supersonic diffuser is selected for discussion and analys?is, Based on the analysis of shadowgraph observation，a simplified model for calculating diffuser flow field is provided , and the corresponding equations and method for design calculation are formulated. Two numerical examples are given. The comparison be?tween these calculated results and the related experimental results appears to show that the present design algorithm based on the simplified model is practically applicable to conceptual design of diffuser for supersonic gasdynamic lasers.

A Study on the Construction of Butterfly Interconnection Network for Two-Dimensional Optical Fast Walsh-Hadamard Transforms

He Liming, Sun Degui, Wang Naxin

1994, 15(3):  58-61.  doi:10.3969/j.issn.1000-1093.1994.03.012

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Based on the butterfly signal-flow diagram for the implementation of two- diniensional fast Walsh-Hadamard transforms, this paper proposes a new optical butter?fly interconnection network construction which can implement two-dimensional fast walsh-Hadamard transforms. Its salient characteristic is the direct correlation of optical processing with the mathematical calculation, thus it is regular and easy to implement, control and adjust. Computer simulation results of the correlation calculation are finally given for the butterfly interconnection network.

Calculation of Relative Velocity in General Space Engagement with Quaternion

An Cheng ye, Zkao Guowen, Duan Xiumin

1994, 15(3):  62-65.  doi:10.3969/j.issn.1000-1093.1994.03.013

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Aigebric and trigonometric expressions of quaternions are used to calculate relative velocities in general space engagement, without the use of any other mathemat?ical procedures. This represents an attempt in introducing quaternion methods in the study of cases involving space engagement.

A Study of the Cutting Performance and Mechanism of Re-Carbide Tool

Pang Siqin, Yu Qixun

1994, 15(3):  66-70.  doi:10.3969/j.issn.1000-1093.1994.03.014

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The application of Rare earth elements in cemented carbides has been one of the national major projects. Systematic experiments were made to study the cutting performance of the Re carbides as cutting tool materials. With the aid of such means as the scanning electron microscope and energy spectrum analysis , the cutting mechanism of the tool was clarified. Furthermore， the technical and economic benefits that the Re carbide tools will bring forth are also analysed in this paper in order to promote exten?sive applications of the new material.

Comprehensive Reviews

A New Technique of Information Processing—An Overview of the Development of Multisensor Integration

Yang Jingyu, Liu Leijian, Li GenShen

1994, 15(3):  71-76.  doi:10.3969/j.issn.1000-1093.1994.03.015

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This presentation introduces a new technique of data processing ： multisen?sor integration, which has now been widely used in various fields. The paper describes research and development of this technique at home and abroad，and mainly discusses its basic concepts and methods, which include： data fusion level, integration methods (or computation and control architecture) and fusion methods.

Research Notes

A I-D Simplified Model of the Muzzle Fireball and Stability of the Temperature Field

Yu Yonggang, Fang Mouxin, Zeng Yongzhu, et al.

1994, 15(3):  77-80.  doi:10.3969/j.issn.1000-1093.1994.03.016

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A simplified model, the solitary wave model, for the muzzle fireball is pro- posed. The theoretically calculated value agrees well with the experimental data for two kinds of small caliber guns. Based on non-equilibrium thermodynamics, influence of the fireball on the stability of axial temperature field at the muzzle is discussed.

Constant Exploding Height Scheme for Proximity Fuze Applied to the Case of Capacitance Fuzes

Cui Zhanzhong, Bai Yuxian, Xu Qingquan, et al.

1994, 15(3):  81-84.  doi:10.3969/j.issn.1000-1093.1994.03.017

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The constant exploding height scheme for proximity fuze is regarded as one among the most important tasks confronting the field of fuze research. The paper gives some basic viewpoints on the implementation of constant exploding height, and starting with an analysis on the target characteristics for the capacitance fuze used in anti-tank missiles, it describes signal processing circuit schemes for the realization of constant exploding height, which has been proved to be feasible through field tests.

Oblique Impact of a Projectile against a Thin Target Plate with High-Speed but Small Angle of Fall

Gao Shiqiao, Qu Kebo

1994, 15(3):  85-89.  doi:10.3969/j.issn.1000-1093.1994.03.018

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Studies the oblique impact of a projectile against a thin target plate at a high-speed but small angle of fall. Applying the law of conversation of system momen?tum ,some nonlinear dynamic impact equations are established. To solve these nonlinear dynamic equations, the central difference method is used. As an example, the impact of a D-35mm projectile against a thin target plate is analysed and calculated .

A Computational Model for the Time Delay of Main Charge Ignition in a Tandem Warhead

Liang xiuqing, Zeng Fanjun, Li Jingyun, et al.

1994, 15(3):  90-93.  doi:10.3969/j.issn.1000-1093.1994.03.019

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Two time-delay computation models for the main charge of the two shaped-charges in a tandem warhead aimed against reactive armour, of which one is for the tandem warhead with a proximity fuze and the other is for the warhead with a trigger fuze. Results of computation are in good accord with those from simulation ex?periments in dynamic armour-penetration.

Engineering Calculation for a Fuel-Air-Explosive (FAE) Explosion Field

Wang Ting zeng, Xu Junpei, Liu Derun, et al.

1994, 15(3):  94-96.  doi:10.3969/j.issn.1000-1093.1994.03.020

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Based on theory of detonation and shock waves? an analysis has been made on experimental results and data collected，both domestic and those from abroad， concerning fuel-air-explosive (FAE). The explosion field is here devided into the FAE zone, the boundary FAE zone and the shock wave zone. Relevant expressions are then given* Results of calculation based on such expressions were found to be in agreement with test results in their means.