Table of Content

31 December 1993, Volume 14 Issue 4

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Paper

Cartridge Extraction in Automatic-Weapons under High Breech Pressure —A Theoretical Study

Gao Naitong, Wu Zhilin

1993, 14(4):  1-6.  doi:10.3969/j.issn.1000-1093.1993.04.001

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Establishs a model for the computation of the process of extraction in automatic-weapons. With the aid of the axissymmetric, elasto-plastic finite-element method and a system of revising the coefficients of loading on the matching nodal points, deformation of the barrel and of the cartridge case under the breech pressure can be obtained and thus the engaging loads between the barrel and the cartridge case, thereby the extraction loads computed. The results of computation agree well with the experimental findings.

A Dynamic Analysis of the Ejecting Process in Automatic Weapons

Sun Zhenhe

1993, 14(4):  7-10.  doi:10.3969/j.issn.1000-1093.1993.04.002

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Gives a dynamic analysis for the ejecting process effected in extractors both with the spring type and the fixed ejectors. Its parameters such as velocities of ejection and rotation are calculated. It is shown that the results of calculation coincides well with those given experimentally.

An Analysis on the Problem of Stress Concentration at the Fillet of a Breech Ring

Sun Yuanxiao, Xun Zhenxiang

1993, 14(4):  11-16.  doi:10.3969/j.issn.1000-1093.1993.04.003

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Based on different theories and techniques for the reduction of stress concentration ? and on the basis of forms of breech ring fillets in general use, over a dozen of fillet forms are proposed. The distribution of stress in the fillet of a breech ring is studied in detail, making use of methods of finite element, boundary element and photoelasticity. It is seen that with the better forms of breech ring fillets a reduction in the maximum tensile stress of about 20 percent is attainable.

Effects of Launcher Vibrattion upon the Hitting Dispersion of Rockets

Pan Hongxia ,Zhao Yan, Chen Guoguang ,et al

1993, 14(4):  17-22.  doi:10.3969/j.issn.1000-1093.1993.04.004

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A quantitative analysis between the rocket hitting distribution and launcher vibration is presented. The inherent vibration is obtained through the aid of FEM as well as techniques of test mode analysis. Analysis of the forced vibration of the launcher is carried out by simulating the response history and analysising the live firing test. Based on these results, a firing control system for optimal timing of the launcher has been designed which in combination with damping techniques, enabled the direction concentration in continued firing of the launcher to be improved by 20%.

A Study on a Unified Differential Equation of the Projectile Motion

Rui Xiaoting, Zhang Yanjiao, Liu Zheng fu, et al

1993, 14(4):  23-27.  doi:10.3969/j.issn.1000-1093.1993.04.005

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A unified differential equation of the projectile motion in the bore and during the ulterior period is developed in this paper. The relationship between the differential equation and the basic assumption is studied. Correct method is introduced for the derivation of the differential equation? making use of the basic assumption.

Lagrange Problem in the Interior Ballistics of a Regenerative Liquid Propellant Gun, Considering Its Variable Cross-Section Barrel

Song Ming, Yang Xinmin

1993, 14(4):  28-33.  doi:10.3969/j.issn.1000-1093.1993.04.006

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Derives the solution of the Lagrange problem for the RLPG with variable cross-section barrel and obtains the conversion relationships among the breech pressure , projectile-base pressure and the average pressure, The results obtained are of general significance. It is proved that the uniform density hypothesis is the sufficiency condition for the proportional expansion hypothesis under the existence of the breech boundary motion and the mass jet.

A New Method for Obtaining the In-Bore Vibration Response of a Projectile-Fuze System

Zhou Tiansheng, Xi Zhanwen, Cken Qingsheng

1993, 14(4):  34-39.  doi:10.3969/j.issn.1000-1093.1993.04.007

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In this paper,the elementary vibration model of a projectile-fuze system is established by means of the mass lumping method. The discrete vibration model thus established theoretically is then modified by the accurate modal parameters, obtained with the help of modal analysis experiments , in order to improve the model accuracy. The acceleration response at the location of the booster device of the system under the projectile base pressure is finally calculated using the modified system vibration model.

An Analysis on the Logical Structure of Fuze Safety Systems

Shi Kunlin, Tan Huimin

1993, 14(4):  40-46.  doi:10.3969/j.issn.1000-1093.1993.04.008

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A state transformation method is applied to analyze quantitatively several logical structures of fuze safety systems. Effect of the method of control adopted in safety systems is compared. The study indicates that time window control seems to be most effective in enhansing the safety of fuze safety systems.

Probability Models for the Rain Field Interference in Proximity Fuze

Cheng shouhao, Liu Xinyu, Shi Jusheng

1993, 14(4):  47-52.  doi:10.3969/j.issn.1000-1093.1993.04.009

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The paper deduces a probability model for the number of rain drops in a rain field space and a probability model flight trajectory in the rain field based on the features. of natural rain field and the flight parameters of a proximity fuze. In these models will be available the distribution of interval time ATi of abutting collisions with rain drops , the distribution of diameter Di of impinging rain drops, the distribution of position colliding with rain drops. These mathematical models will provide basis for computer simulation in laboratory.

Thermal Decomposition of HMX and Its Autocalysis

Jia Huiping ,Bai Mulan

1993, 14(4):  53-57.  doi:10.3969/j.issn.1000-1093.1993.04.010

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Using DSC-Coulometric Nitrogen Oxide Detector，Time of Flight Mass Spectrometer , the authors studied the thermal decomposition characteristics of HMX and its catalytic systems. The results showed that HMX decomposes with the property of autocatalysis. The reaction heat and decomposition rate in the condensed phase of HMX increase and the effect of pressure on the decomposition decreases with the addition of catalysis. These may cause the increase in burning rate and decrease in pressure exponent of HMX-CMDB propellant.

Comprehensive Reviews

Principles and Application of Compressible Fluid Recoil Mechanisms

Gao Shuzi, Zheng Jianguo

1993, 14(4):  64-68.  doi:10.3969/j.issn.1000-1093.1993.04.012

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A silicone ffuid (Dow corning lOcs) is used in a compressible fluid recoil mechanism as its fluid medium, its compressibility being (3 ?4)% , at normal temperature and under a pressure of 35Mpa. Thus in flowing through the throttles during the recoil phase, the fluid can create a resisting force and dissipate the recoil energy. On the other hand, by taking advantage of its compressibility, it can also store a part of the recoil energy to supply energy for the counter-recoil motion of the gun. This kind of recoil mechanism is simple, compact and reliable. It can reduce the peak of the recoil force, thus reducing the recoil force to some degree. The development, principle and typical structure of the compressible fluid recoil mechanism is introduced with its applications in normal recoil and soft recoil guns. Prospect of application of this technique is also discussed.

ExperimentaI Techniques and Analysis

Calculation of the Static and Dynamic Characteristics of Prsssure-Measuring Cylinders

Wu Ying, Zhu Mingwu

1993, 14(4):  69-74.  doi:10.3969/j.issn.1000-1093.1993.04.013

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Pressure-deformation relationships of various pressure-measuring cylinders are given in this paper. The factors of influence on the static characteristics of the pressure-measuring cylinders are analyzed，and a new series of pressure-measuring cylinder designed. A series of Split Hopkinson bar experiments with the pre-pressured copper cylinders used for chamber pressure measurement were carried out，and the dynamic constitutive relations for this kind of cylinders obtained. Thereby the mathematical mode of the copper cylinder pressure-measuring system is established. The correction curves of the dynamic errors are theoretically given.

An Experimental Investigation on the Effect of Material Density of Metal Targets when Penetrated by a Long Rod Projectile

Sun Gengchen , Dong Jiaxiang, Zhang Zhishen, et al

1993, 14(4):  75-78.  doi:10.3969/j.issn.1000-1093.1993.04.014

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Research Notes

Performance Analysis of Chambered Launchers

Wu Yingxiang, Zheng Zhichu, Lin Tong ji

1993, 14(4):  79-84.  doi:10.3969/j.issn.1000-1093.1993.04.015

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The performance of one-stage launchers with chamber age is analysed in this paper by the method of characteristics. Influence of the reservior length，the launch-tube length, section area ratio between chamber and launcher barrel and the projectile mass are investigated individually. Variation of the base pressure during the entire launching process is obtained. This method can be used to calculate the performance of light-gas guns.

Non Destructive Testing and Evaluation for Explosive Charge in Artillery Shells

Zhu Senyuan, Li Lin

1993, 14(4):  85-88.  doi:10.3969/j.issn.1000-1093.1993.04.016

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This paper introduces the X-ray real-time radiography with image processing and the system XNIP-2G developed in the Southwest Institute of Automation Research. The pre-processing programmes and the defect recognition programmes used in this system are described. The system is already in successful use in the testing and evaluation of explosive charges in artillery shells.

A Study on the Synthesis of N ,Nˊ，N〃-Tri (2-Nitro-Benzodifuroxanyl)-Melamine

Wang Naixing, Chen Boren, Ou Yuxiang

1993, 14(4):  89-91.  doi:10.3969/j.issn.1000-1093.1993.04.017

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Reports on the synthesis of the title substance which possesses only a few hydrogen atoms in its structure and a high density. The substance is obtained by condensation followed by nitration, azideation and denitrogenation. Some theoretical analyses are given together with their explanations.