一种电磁式爆炸分离冲击环境模拟试验技术研究

Study on the Electromagnetic Excitation Method of Pyroshock Simulation Test

爆炸分离冲击是航天器所经历的最严酷的力学环境之一,为了避免一些箭载仪器设备或者结构在飞行中损坏,因此需要进行爆炸分离冲击环境试验。本研究针对航天产品爆炸分离冲击环境宽频响、高作用幅值的特点,提出了非接触式电磁激励响应板方式的爆炸分离冲击环境模拟试验方法,建立了电磁激励系统多物理场耦合模型,开展了电磁激励爆炸冲击环境模拟的试验研究,获得薄板在电磁加载过程中洛伦兹力和薄板响应的关系,揭示了采用该方法进行冲击环境预示与控制的机理,为实现电磁激励载荷作用下的结构响应的可预测提供了研究基础。

Pyroshock is one of the most severe environments experienced by spacecraft.In order to avoid disfunctions and damages of instruments or structures equipped during flight,the launch environment testing must be conducted to guarantee the electronic units,sub-systems,and full-scaled systems with the capability of withstanding explosive loads.Aiming at the characteristics of broadband responses and high-amplitude of pyroshock events,the electromagnetic excitation response plate is proposed for the first time to simulate the pyroshock environment in this paper.Firstly,the modeling of the electromagnetic/thermal/structural coupling analysis is developed to analyze the relationship between the transmission mechanism of Lorenz force and thin plate response.Then,simulation results are validated by experimental tests of the electromagnetic excitation response plate subject to the pyroshock environment.Moreover,understanding the control mechanism and predictions of electromagnetic excitation forces are performed using numerical simulations.It is concluded the proposed method provides a theoretical and experimental basis for the development of Pyroshock environment simulation control technology.