Table of Content

30 September 1992, Volume 13 Issue 3

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Paper

A Classical Interior Ballistics Model for Regenerative Liquid Propellant Guns

Jin Zhiming,Yang Xinmin,Song Ming

1992, 13(3):  1-7.  doi:10.3969/j.issn.1000-1093.1992.03.001

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In the interior ballistic cycle of a Regenerative Liquid Propellant Gun there exist some special phenomena such as jet formation and breaking, atomization of the liquid propellant etc. making the interior ballistic problem very complex. This paper approximates the drop size and law of burning of the liquid propellant using the classical interior ballistic relationships, the state equation of the liquid phase using the isothermal compression relationship and the jet process using the non-stationary Bernoulli equation. A closed set of the interior ballistic equations is established under some assumptions. Stable results of the interior ballistic computation were obtained with the help of the structural parameters of the USA 120mm Regenerative Liquid-Propellant Gun.

Theoretical Analysis of the Force Exerted on the Bolt by Cartridge Case when Firipg

Wang Xueyan, Song Guanghui

1992, 13(3):  8-15.  doi:10.3969/j.issn.1000-1093.1992.03.002

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Proceeding from the actual load- bearing condition of the bolt when an automatic weapon is firing, formulas for calculating the normal pressure between the cartridge case and the chamber，the vesistance force caused by the axial deformation or shift of the cartridge case, and the interactive force between the cartridge case and the bolt are derived, based on the theory of thin-wall cylindrical shell bearing internal pressure and the assumption of single curve under simple loading condition, the coordinated relationship between the tangential deformations of the cartridge case and chamber, and the coordinated relationship between the axial deformations of the cartridge case and the locking mechanism. The comparison for calculated and experimental results of case-bolt force are also given.

Design of Gun Barrels Allowing Slight Amounts of Perftiajient Peformation

Han Yuli

1992, 13(3):  16-26.  doi:10.3969/j.issn.1000-1093.1992.03.003

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In this paper a new design method for gun tubes is suggested, in which the elastic strength pressure (ESP) is set on a value permitting a slight amount of permanent deformation in the inner surface, say 0. 1 % . Discussions are given in the following topics ： the permanent deformation of inner surface in the tube, influnence on the Bauschinger effect and selection of the optimal permitted permanent deformation . Tests of elasto-plastic loading and unloading in cylinders having various wall ratios and made of steels were carried out. Results of experiments coincide well with the expectation near εya= 0. 1 % .

A Study on Modified TNT tomposites

Xu Gengguang, Wang Tingzeng, Zhou Lin

1992, 13(3):  27-30.  doi:10.3969/j.issn.1000-1093.1992.03.004

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The main problems facing the process of screw loading of TNT charges have been analyzed. It has been found that the key issue is that the plasticity of military TNT ^ generally does not meet the requirements of screw loading. This motivates the search for modified TNT composites has been undertaken. Its plasticity is improved and the exudation of TNT can be controlled. The experimental results show that the global properties of the modified TNT meets well with the technical requirements. It thus lays a foundation for screw loading at room temperatures.

Application of Self-Tuning Control In Long-Range Anti-Tank Missiles

Kang Jingli, Zhang zhiyong, Cai Jibing

1992, 13(3):  31-35.  doi:10.3969/j.issn.1000-1093.1992.03.005

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In the paper a practical example of compound self-tuning control method based on a low- order equivalent model having robust weighting and PI control and applied on long-range anti-tank missiles is given. Results from simulation have shown the significant advantages of this guidance system in respects of its guidance precision，simplified measuring equipment, enhanced anti- interference capacity and reduced amount in computation. The guidance system can also meet varied tactical demands, e. g.，with long-range attacks and top attacks of tanks and in attacking helicopters.

An Analysis of Lethality and Accuracy for Top-Attacking Anti-Tank Weapons

Song Zhenduo

1992, 13(3):  36-40.  doi:10.3969/j.issn.1000-1093.1992.03.006

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Having calculated the distribution of top-attacking anti-tank warheads over two categories of typical targets, this paper provides a formula for computing the lethality requirement of cruise, curved and paroboiic trajectories, and an analysis of the accuracy requirement for the top-attacking weapons.

IR Radiation Sources for Jammers

Chen Boruo

1992, 13(3):  41-45.  doi:10.3969/j.issn.1000-1093.1992.03.007

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Mathematical expression of the radiation intensity from IR radiation sources used in jammers resisting AM air-to-air missiles is derived formula for the estimation of the electric power of a simple jammer is also given. They offer a satisfactory reference for the preliminary design of a jammer and its radiation source.

A Multiple Light Sources Fast Recognition Algorithm for TV Goniometers

Yu Wenbo

1992, 13(3):  46-51.  doi:10.3969/j.issn.1000-1093.1992.03.008

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According to the requirement of real- time calculation in TV automatic tracking, a fast recognition algorithm which identifies the connectivity and counts other geometric parameters for the figures line by line is established. This method can distinguish a missile’s beacon light source from other strong disturbing light sources effectively, and has been successfully used in engineering practice.

A Study on the Roll Forming and Heat Treatment after Deformation of the Binder-Stud for a Dieset Engine Cylinder

Gao Shiyi, Fu Peifu, Zhang Jiamnin Chen Qingmin, Wang Zhong, Niu Guozhong, Ding Decheng

1992, 13(3):  52-58.  doi:10.3969/j.issn.1000-1093.1992.03.009

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It is found that if the roll passes and the the rolling processes are reasonably chosen and the roll forging dies are designed properly, the stud can be formed on a suitable roll forging mill. When the roll forging draught is 26. 9% and the tempering temperature is in the range from 550 ℃ to 600℃ , while the plasticity and tenacity of the deformed and the undeformed parts of the stud are almost identical , the strength and hardness of the former are higher, It is seen that the stiid can recommendably be produced by roll forming.

A Falling Order Method of Compulation for Determining Positions of Complex Planar Linkages

Zhang Jiyuan, Shen Shoufan

1992, 13(3):  59-64.  doi:10.3969/j.issn.1000-1093.1992.03.010

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In this paper, the falling order method of computation is suggested for the determination of positions of complex planar linkages. A planar quadrilateral is adopted as the basic loop in building up the displacement equations，and four basic types of solutions are given.

Experimental Techniques and Analysis

An Experimental Study on the Tensile Properties and Damage Mechanism of Three Alloy Steels at High Strain Rate

Yang Daoming,Yu Jie, Li Zitong

1992, 13(3):  65-73.  doi:10.3969/j.issn.1000-1093.1992.03.011

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The dynamic properties of three steels D60, 58SiMn and No. 45 are systematically studied at high strain rate by using a well-designed SHTB equipment. The experimental results show that the dynamic yield stress and tensile elogation of all tested materials are higher than their static values, respectively. However, different materials indicate different strain- rate sensitivity. In addition, the dynamic process of damage evolution is studied in detail with the metallographic technique for observing the cross and logitudinal sections of the tested specimen.

Research Notes

Criterion on the Recognition of Seperation of Two Colliding Components and Their Re-Gollision

Huang Wei, Zou Yida

1992, 13(3):  74-79.  doi:10.3969/j.issn.1000-1093.1992.03.012

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On the basis of the dynamic finite element equation, the problem of collision among moving components is surveyed, with the introduction of a criterion on the recognition of the seperation of two colliding objects and their re-collision. A method of computation for the analysis of moving components colliding repeatedly is then put forward. This provides a way of analysis for problems of strength and life of moving components in an automatic weapon. An example shows that the method leads to results of enough accuracy.

Mathematical Analysis of the Arming Process in Fuze Safety Systems

Fan Ningjun, Ma Baohua

1992, 13(3):  80-84.  doi:10.3969/j.issn.1000-1093.1992.03.013

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Based on the basic theory of fuze safety systems，some mathematical methods for the description of the arming process in such systems are studied. As typical examples the arming processes of the Soviet fuze B-429 and U. S. fuze M739 are analysed using these methods. The results show that the methods can reflect quantitatively the rules and characteristics of the arming process and are thus helpful to the research and design of fuze safety systems.

Simultaneous Measurement of Maximum Accderation during Flight and Maximum Thrust Pressure on a Projectile Using the Crusher Gauge

Pan Xuewen

1992, 13(3):  85-87.  doi:10.3969/j.issn.1000-1093.1992.03.014

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The paper describes a crusher gauge for the simultaneous measurement of the maximum amount of acceleration in a projectilemovement and the maximum pressure exerted on the projectile. Methods used in the evaluation of experimental data are given and the derivation of the resistance factor φ1 from the measurements is discussed.

A Method of Determining the Minimutn Generalized Interference Value Necessary for the Interference Fit

Xu Furen

1992, 13(3):  88-91.  doi:10.3969/j.issn.1000-1093.1992.03.015

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In this paper，a new formula for the determination of the minimum generalized interference value necessary for the interference fit is put forward，making use of concepts from elasticity mechanics, physics and the traditional design theory on interference fit. Because the effects on the degree of tightness both of the environment temperature when machining the fitting surfaces, and that of the materialsJ expansion coefficients of the fitting elements have already been taken into account and implied in the new formula, it is applicable to the design of various interference fits.

Milling Tool Wear and Surface Roughness Detection by Means of Ultrasonic Techniques

Wang Jiemin,Chen Renheng,Zhao Wanyi,Qu Liangsheng

1992, 13(3):  92-96.  doi:10.3969/j.issn.1000-1093.1992.03.016

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In this paper，the in-process detection method for the workpieces is investigated by means of ultrasonic echo envelopes. The relationships among tool wear, surface roughness of workpiece and ultrasonic echo envelope are verified through experiments. Some new useful results are achieved.