The Modeling Studies Of Effect Of Random Factors On The Performance Of Interior Ballistics

In this dissertation, based on lots of experiment data, the random models have been set up to describe the random phenomena of interior ballistics in guns. The random simulation is presented to analyze the performance of interior ballistics. The main contents are as following.(1) The variance analysis method is used to process a lot of test data by gun shooting. The influence of the initial random parameters of interior ballistics on the maximum pressure and probable error of muzzle velocity is studied by the statistic analyse.(2) Based on the difference of propellant performance, a random burning rate is presented. The form functions are built to describe propellant partly burning. The classical random interior ballistics models are developed to simulate the random process in guns by Monte-Carlo method.(3) The random breaking model is established to describe the random process of igniter vent holes breaking. Combining one-dimensional two-phase flow model of igniter and this random breaking model, the random process and some statistic distribution in igniter are solved.(4) The random models of two-phase flow are established to analyze the influence of the random process of igniter vent holes breaking and propellant random burning on the performance of interior ballistics. Monte-Carlo method is used to solve those models. Some statistic distributes results caused by holes random breaking and propellant random burning are obtained. Furthermore, the relations between the maximum negative pressure difference and the minimum porosity at projectile base are also investigated. And some useful results are obtained.(5) A new model is set to analyze the experimental data of grain fracture caused by particles impact and intergranular compression at low temperature. Some value results are obtained from this theoretic analysis. A new method is proposed to compute grain fracture degree and form functions of propellant.(6) A theoretical model is established to analyze the effects of the random distribution of local initial porosity on the performance of interior ballistics. The statistic relations of the average porosity in gun verses time are given.