燃气-液压混合驱动大惯量起竖系统内弹道建模与参数优化 *

Interior Ballistics Modeling and Parameters Optimization of Erecting System with Large Inertia Based on Hybrid Drive of Gas and Hydraulics

关键词:  燃气-液压  大惯量起竖系统  内弹道计算  参数优化  起竖方案

Key words:  Gas-hydraulic  Erecting system with large inertia  Interior ballistics analysis  Parameter optimization  Erecting scheme

摘要:

针对传统起竖方式起竖缓慢、起竖动力源功率密度小等问题，基于燃气与液压混合驱动的起竖方案，设计了一种变截面的固体药柱。基于经典零维内弹道方程，考虑燃气气-粒两相流影响及点火药、固体装药两种燃气的共同作用，结合起竖机构的运动规律，以大惯量起竖装置为研究对象，建立了起竖系统的一体化动力学模型。参照目标起竖角度曲线，采用遗传算法对药柱结构参数进行匹配，并对燃气驱动方案进行优化，最终确定了前端直径0.1m，后端直径0.04m的变截面药柱及药柱燃烧1.5s，燃气驱动4.62s的起竖方案。正向内弹道计算结果表明，基于精细化模型的内弹道优化，可使系统在较短时间内(4.62s)以较小的过载(小于0.35g)起竖至目标角度(1.28rad)。

Abstract:

To improve the traditional erecting process with lower velocity and smaller power density， a variable cross-section grain is designed based on the gas-hydraulic hybrid drive erecting scheme. Combing with the erecting mechanical structure， an integrative dynamic model of the erecting system with large inertia is established based on the zero-dimension interior ballistics model， which takes into account the effect of gas-particle two-phase flow and the united influence of igniting powder and grain. Referring to the target erecting curve， the generic algorithm(GA) program is used to match the structure parameters of the grain， and the gas-driven scheme is optimized. An optimal variable cross-section grain is designed and a final erecting scheme is determined. Respectively， the diameters of the optimal grain are 0.1m in the begin section and 0.04m in the end section. The whole drive time of the gas is 4.62s while the grain burns 1.5s. The numerical experimental results demonstrate that the optimized system could reach the goal angle(1.28rad)under lower overload(below 0.35g) at shorter time(4.62s).