Power-flow-based Particle Damping for Shock Mitigation in Pyrotechnic Separation Structures

XIAO Wangqiang; ZHANG Hao; XIE Junhu; SU Binshan

doi:10.7643/ issn.1672-9242.2026.05.006

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Equipment Environmental Engineering ›› 2026, Vol. 23 ›› Issue (5) : 44-52. DOI: 10.7643/ issn.1672-9242.2026.05.006

Aviation and Aerospace Equipment

Power-flow-based Particle Damping for Shock Mitigation in Pyrotechnic Separation Structures

XIAO Wangqiang¹, ZHANG Hao¹, XIE Junhu², SU Binshan²

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Abstract

The work aims to propose a power flow-directed side-cavity particle damper shock mitigation design method tailored for equipment shock environment control to address the issue where high-frequency pyrotechnic shock waves generated by explosive bolt separation in aircraft tend to propagate along structural connections to the main beam surface, thereby threatening onboard equipment safety. First, transient stress and velocity fields were obtained via explicit dynamics, enabling calculation and visualization of structural power flow. This identified the vertical walls on both sides of the upper clamp as key pathways for shock energy transmission to the main structure. Based on this, particle dampers were embedded and encapsulated within the side cavity to directly intervene in the primary energy pathway. Subsequently, the total energy dissipation was used as the evaluation metric throughout the entire shock process, and parameter optimization was performed for the particle material, particle size, and filling rate via the discrete element method. The recommended configuration was tungsten-based particles with a diameter of 2 mm and a filling rate of 90%. Ground-based separation comparison test results demonstrated: under conditions where the peak values of the shock response spectrum at input measurement point A1 remain essentially consistent, the peak value at measurement point A₂ on the main beam surface within the target protection zone decreased from 570.763 g to 242.642 g, representing a reduction of 57.49%. These results demonstrate that this method can significantly reduce transmitted shock levels while ensuring input consistency, providing an explainable, designable, and verifiable engineering approach for protecting structures from explosive separation shock environments.

Key words

pyrotechnic shock / explosive bolt separation / shock response spectrum (SRS) / power flow / particle damping / discrete element simulation / energy transmission

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XIAO Wangqiang, ZHANG Hao, XIE Junhu, SU Binshan. Power-flow-based Particle Damping for Shock Mitigation in Pyrotechnic Separation Structures[J]. Equipment Environmental Engineering. 2026, 23(5): 44-52 https://doi.org/10.7643/ issn.1672-9242.2026.05.006

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