Table of Content

31 March 1988, Volume 9 Issue 1

Previous Issue    Next Issue

Paper

Time Series Statistical Simulation for Tracked Venicie Dynamic Systems

Ju Naijun

1988, 9(1):  1-9.  doi:10.3969/j.issn.1000-1093.1988.01.001

Asbtract ( )   PDF (9548KB) ( )  

References | Related Articles | Metrics

This paper discusses a mathematical model and associated computer program for the time series statistical simulation of tracked vehicle dyna-mic systems. The excitations of vehicle random dynamic systems —— the samples of road surface roughness time series are statistically simulated by use of the RAMA(p，q) models. The state equations of vehicle systems are solved using the Rugge-Kutta method. The samples of vibration response time series are obtained and processed by the probabilistic method to give the statistical characteristics， such as root-mean-square，autocorrelation function，power spectral density function，probability density function，etc. The results of such simulation tests on a computer have practical value for vehicle engineering development and have actually been applied in performance calculation programs of tracked vehicle systems engineering. The simulation sample data obtained can also be used in the optimum design of vehicles and in simulation tests of other dynamic systems resting on it.

Optimum Design of Vehicular Heat-Exchangers

Yao Zhongpeng Qi Beizhen

1988, 9(1):  10-16.  doi:10.3969/j.issn.1000-1093.1988.01.002

Asbtract ( )   PDF (7765KB) ( )  

References | Related Articles | Metrics

On the basis of an analysis of the design requirements of vehicular heat exchangers， the authors put forward an optimum design method for exchangers that is better than conventional design methods， and establish a mathematical model for the optimum de.sign of vehicular heat exchangers. An example showing the design of an air-to-water heat exchanger with pipes and bands is given. The results are compared with those given by the conventional method, which shows that the method proposed is superior，giving better quality of design and saving time。

An Analysis of the Response of the Human-Pistol System to Pistol Breech Force in Shooting

Xie Daxiong

1988, 9(1):  17-25.  doi:10.3969/j.issn.1000-1093.1988.01.003

Asbtract ( )   PDF (8652KB) ( )  

References | Related Articles | Metrics

This paper presents a mechanical model for the humanp-i stol system taken as a six-degree multibody system consisting of four rigid bodies. Dynamic equations of the system are sets up in terms of Hanavanˊs human body mathematical model. A theoretical analysis and computer calculation are conducted for the response of the human-pistol system aroused by the pistol breech force，the results of which match smoothly with that of the experiments obtained through high speed photography. This gives a preliminary study for the development of universal handheld-weapon test fixt ures.

On the Optimal Burst Height and Burst Height Dispersion of Antiper-sonnet He Projectiles

Peng Jicheng、 Cheng Yunmen

1988, 9(1):  26-35.  doi:10.3969/j.issn.1000-1093.1988.01.004

Asbtract ( )   PDF (9535KB) ( )  

References | Related Articles | Metrics

Based on an analysis of quantity relations between the burst height， high burst dispersion and the lethal area，this paper develops a mathematical model for determining the optimal burst height of HE projectiles and the high burst dispersion. Air burst HE projectiles are mainly used to fire at personnel in trench， A formula for calculating the impact area of an infantryman in standing position in trench is thus presented, the method to calculate the lethal area is discussed， and results of a number of projectile types are obtained.

Interior Ballistic Model for Grenades Fired with Blank Cartridges

Zhou yanhuang、Liu Qianli

1988, 9(1):  36-41.  doi:10.3969/j.issn.1000-1093.1988.01.005

Asbtract ( )   PDF (6323KB) ( )  

References | Related Articles | Metrics

This paper presented the technique of area-jump treatment within barrel and modification of the interior ballistic model is given for tlie barrel where the blank cartridge is used. The calculation results accords quite well with the experimental results. Tte modified model and its program are satisfactory for engineering applications of such interior ballistics problems。

Dynamic Stability Criteria of Free Flight No-Spinning Mortar Projectiles

Dong Liang

1988, 9(1):  42-51.  doi:10.3969/j.issn.1000-1093.1988.01.006

Asbtract ( )   PDF (10123KB) ( )  

References | Related Articles | Metrics

Effects of linear yawing，nolinear damping and pitching moments on free flight no-spinning mortar projectiles are discussed in this paper. A yawing stability factor and a damping stability factor are introduced first. By these factors are described criteria that determine unexpected falling-down of free flight mortar projectiles.

Experimental Techniques and Analysis

Identification of Thirteen Kinds of Explosives by PGC

Fu Ruonong、Tian Linxiang、Liu Huwei、Pang Zengyi

1988, 9(1):  52-58.  doi:10.3969/j.issn.1000-1093.1988.01.007

Asbtract ( )   PDF (7331KB) ( )  

References | Related Articles | Metrics

Pyroljsis-Gas Chromatography(PGC or PyGC)is not only an important method for the study of a variety of polymers，but also a rapid and simple means for the identification of many organic compouds. In this paper， .PGC is used for the identification of explosives， including PETN，NC， GINA, HMX，RDX，Te，TNT，DNT，TNA，AP，TCH，HC〇 and TTZ. Results are seem to be satisfactory. The distinguised fingerprint pyrogram for each sample has been obtained，and experimental reproducibility has been investigated. Selection of pyrolysis temperature；, possibility of studying heat sensitivity and thermal decomposition of explosives by PGC are also discussed.

Research Notes

The Syntheses of 1,1，2, 2,-Tetrakis(Difluoroaminomethyenenitroamino) Ethane and Its Related Compounds

Zheng Yuanyang、Zhou Jizhang、Zhou Dalai、Zhang Mingnan

1988, 9(1):  59-63.  doi:10.3969/j.issn.1000-1093.1988.01.008

Asbtract ( )   PDF (5191KB) ( )  

References | Related Articles | Metrics

The compound 1, 1, 2, 2-tetrakisnitroaminoethane ( TANE ) in the medium of concentrated sulfuric acid was condensed with polyfomaldehyde to produce 2，6，8，12-tetranitro—2，6，8，12-tetraaza—4，10-dioxybiscyclo (5, 5, 01.7)dodecane ( biscycloether )，which reacted with difluoroamine in the presence of fuming sulfuric acid to give the title compound. The two compounds were characterized by their molecular weight, element analysis and IR spectrum respectively. The conditions and phenomena for formation of the two compounds were discussed.