随机参数超空泡射弹弹道随机特性分析

Trajectory stochastic characteristics analysis of supercavitation projectile with stochastic parameters

超空泡射弹的发射装置及射弹在制造,安装过程中存在各种不确定性。本文采用最大熵法来分析这些不确定性对射弹弹道的影响。介绍了超空泡射弹的动力学模型,对射弹的受力特性和随机参数进行了分析。根据给出的理论编制了基于最大熵法的随机参数超空泡射弹弹道随机特性分析的仿真程序,并对一个模型弹仿真计算。计算表明,与发射装置有关的随机参数中,初始角速度影响最大,初始水深影响最小,而与生产过程有关的随机参数中,偏转角影响最大,空化器角度和射弹质量影响较小;另外,考虑所有随机参数存在时,弹着点并不是正态分布。所以有必要在试验之前进行弹道的随机分析,给出弹着点的合理分布。

The launching device and production process of supercavitation projectile own various uncertainty.Utilizing maximum entropy method,the influence of uncertainty to projectile trajectory was analyzed.The dynamic model of supercavitation projectile was introduced,and load characteristics of projectile and principle of stochastic parameters were analyzed.The simulation program of trajectory stochastic characteristics analysis of supercavitation projectile with stochastic parameters based on maximum entropy method was programmed,and a model was calculated.The results indicate that the influence of initial angular speed is the maximum and initial water depth is minimum in all stochastic parameters relating launching device,and the influence of deflection angle is the maximum and the angle of cavicator and projectile mass are minimum in all stochastic parameters relating production process.Moreover,when all stochastic parameters exist,the impact point isn＇t normal distribution.Therefore,it＇s necessary that the trajectory stochastic analysis should be implemented and reasonable distribution of impact point should be given before experiment study.