火工作动筒的低冲击结构设计与验证

Low Shock Structure Design and Verification of Pyrotechnic Actuated Cylinder

针对航天火工装置的低冲击需求,基于行程式火工作动筒工作原理和结构,设计一种具有初始强锁定弱解锁及低冲击结构的推式火工作动筒。初始锁定结构设计为“卡环+浮动活塞”的强锁定弱解锁结构,并采用燃气缓冲阻尼技术降低作动过程产生的冲击。利用经典内弹道理论建立了火工作动筒作动过程的理论模型,仿真结果与实验结果一致性良好,通过实验与仿真结合的方法验证了该火工作动筒的低冲击结构。结果表明,具有低冲击结构的火工作动筒在作动过程中满足低冲击要求,固定端支耳处的最大冲击峰值仅为389g。

In response to the low shock requirement of aerospace pyrotechnic devices,based on the working principle and structure of the stroke-type pyrotechnic actuated cylinder,a push-type actuated cylinder with an initial strong lock,weak unlock and low shock structure was designed.The initial locking structure was designed as a"snap ring with floating piston"strong locking and weak unlocking structure,and gas buffer damping technology was used to reduce the shock generated during the actuation process.The theoretical model of the pyrotechnic actuated cylinder was established by using the classic interior ballistic theory,and the simulation results show good agreement with the experimental results.The low shock structure of the pyrotechnic actuated cylinder was verified by the method of combining experiment and simulation.The results show that the pyrotechnic actuated cylinder meets the low shock requirements during the actuation process,the maximum shock peak at the fixed end lug is only 389 g.