Table of Content

30 June 1986, Volume 7 Issue 2

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Paper

Dynamic Equations for Automatic Weapons with Dry Friction

Wang Menglin，Wang Jiping

1986, 7(2):  1-10.  doi:10.3969/j.issn.1000-1093.1986.02.001

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Starting from the viewpoint of graph theory, this paper analyses the structure for automatic weapons, and develops a method using the energy transfer coefficient to deal with effects of dry inction. Dynamic equations in matrix form are derived for automatic weapons. This paper daels with planar problems only, yet the theory and method developed can be used for dynamical analysis of various mechanisms in automatic weapons.

Thermal Explosion and Times—to—ignition in Uniform-Temperature Systems

Feng Changgen, Terry Boadington,Peter Gray

1986, 7(2):  11-19.  doi:10.3969/j.issn.1000-1093.1986.02.002

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Kinetics and the Mechanism of Thermal Decamposition of Explosives Part I Thermal Decomposition of Linear Polymethylefle-Polynitramiaes

Liu Ziru,Zi Deyin,Wu Chengyun, Zhang Minnan

1986, 7(2):  20-29.  doi:10.3969/j.issn.1000-1093.1986.02.003

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Quantum Chemical Calculations for the Equilibrium Geometric Configuration of N, Nˊ -Dinitromethylene-Diamine Molecules (Utilizing CNDO/Ⅱ), on the Relationship between Thermal Stability and Its Moleca Iar Structure

Jiang Deling,Chen Zhiwen

1986, 7(2):  30-36.  doi:10.3969/j.issn.1000-1093.1986.02.004

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The geometric configuration of N,Nˊ -dinitromethylenediamine mole?cules has been fully optimized and the optimized structure of the molecu?les determined utilizing CNDO/Ⅱ . Formulas reflecting tke EAB-YAB rela?tionship were proposed，Where EAB is the bond energy between atoms A and B, and YAB is the value of the contribution of the interaction between atoms A and B to total molecular energy with its sign reversed.The bond energy for HN(NO2)CH2N(NO2)H,CH2 = N(NO2)Were calculated. Further， relationship between the thermal stability of HN(NO2)CH2N(NO2)H and its molecular structure has been discussed.

Generalized Yolterra Equations for Non-nolonomic Mechanical Systems with Variable Mass

Zhang Jun,Mei Fengxiang

1986, 7(2):  37-48.  doi:10.3969/j.issn.1000-1093.1986.02.005

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One of the authors has recently extended the Volterra kinetic diffe?rential equations for linear non-holonomic systems to relevant equations for non-linear non-holonomic systems[2] . On what has already been achie- ved, variable mass systems are dealt witli in this article，and generali?zed Volterra Equations for non-holonomic systems with variable mass are obtained. Two examples are given. The generalized Voterra Equations are transformed to ones in terms of the generalized coordinates.

Research Notes

Application of Angular Distribution in Beam Divergence Analysis

Zhu Shunxian

1986, 7(2):  49-54.  doi:10.3969/j.issn.1000-1093.1986.02.006

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The article seeks to describe from the concept of angular distribution the beam propagation in free space in such a way as to prove the actual validity of this concept through the test data acquired，and thus put for?ward the definition that beam divergence is depend on the geometrical subtended angle of the beam and the angular distribution.

Optimum Design for single-chamber Double-thrust Solid Rocket Motors

Wang Songbai

1986, 7(2):  55-59.  doi:10.3969/j.issn.1000-1093.1986.02.007

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This paper presents a method of optimum design for single-chamber double-thrust solid rocket motors. Impulse-weight ratio is selected as the purpose function, this is ana?lysed together with the constraints involved, changes in motor characte?ristics with the design variables. An optimum design program is set up based on SUMT. An example of optimum design is given, showing satisfactory results.

Atomic Absorption Spectrophotometry of Chromium in Steels for Light Weapons

Fang Liansheng,Ma Ning

1986, 7(2):  60-63.  doi:10.3969/j.issn.1000-1093.1986.02.008

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Conditions for the atomic absorption spectrophotometric determination of chromium in steels for light weapons are investigated， using lean ratio air-acetylene flames. Ferro—basis (an abundance of ferric ions) does not interfere witn the determination of chromium wheh the rate of airflow is 500 l/h and the acetylene flow 85 l/h to 90 l/h. The interfering factors of other alloying elements, acids, and oxidizers are studied. The method can determine chromium without checking or releasing reagent (eg. sodium sulphate). The sulution can therefore be used directly afterwards for the determination of other elements.