点式分离火工冲击源仿真分析及载荷形成机理

摘要

应用航天器“振源系统—近场结构”一体化建模和分析方法，对点式分离火工冲击源的工作过程进行完整建模和数值仿真分析，提取星箭分离面的力函数。得到了高压气体和爆轰产物在腔体内往复运动、形成爆压双峰的运动规律以及关键结构件在爆压作用下往复运动与其它结构件撞击实现分离解锁的运动规律。在此基础上分析爆压载荷在分离螺母内部的传递机制，得到了星箭界面载荷由爆压载荷以及传递路径上的结构运动、撞击和材料内部压力衰减共同决定的载荷形成机理。%Using the ‘source system-near field structures’integrated modeling and analyzing method,the work process of a point separating pyrotechnic is simulated.The loading function inside the interface of the spacecraft and launch vehicle is computed.The motion law of the high pressure gas and detonation products inside the hermetic cavity is reciprocating. The key structures bump to trigger the unlocking of the separating nut.The load transfer mechanism inside the separating nut is analyzed,and the forming of the load inside the interface of the spacecraft and launch vehicle is determined by the explosion pressure,together with the motion state and the impact of the parts through the transfer paths,and the stress attenuation inside the materials.