Shock Response of Precision Linear Shaped Charge in a Multistage Rocket System

Abstract

Recently, a linear pyrotechnic device known as a precision linear shaped charge (PLSC) was proposed for the stage separation of a multistage rocket system. PLSCs exhibit improved system reliability by simplifying the system design involved in the stage separation process. However, they may cause the malfunction of electronic components in such systems due to pyroshock that is generated during their operation. In this study, a numerical method based on a two-dimensional (2D) hydrocode and three-dimensional (3D) explicit code was applied to evaluate the generation and transmission of pyroshock induced by the operation of a PLSC in an aerospace system structure. The analysis results were verified using PLSC operation tests. The analysis and experimental results were quantified using maximax shock-response spectrum curves. From this, the pyroshock attenuation characteristics related to the distance from the PLSC and the presence of a discontinuity along the shockwave transmission pathway were discussed.