Single degree of freedom dynamic theoretical model for a thermal protection system

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (2) : 98-104.

HUANG Jie1，YAO Weixing1,2，SHAN Xianyang3

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Abstract

A single degree of freedom random dynamic theoretical model for the thermal protection system (TPS) is proposed to study the acceleration response of tile and dynamic strength of the strain isolation pad (SIP). The linear and nonlinear stiffness of SIP is considered. The solutions of linear theoretical model are derived, and the iterative solving procedure of nonlinear theoretical model is studied. The rationality of linear theoretical model is verified by comparing linear theoretical solutions with the results of finite element analysis. The theoretical solutions of nonlinear and linear theoretical models are compared. The dynamic responses and the equivalent linear stiffness coefficient are related to the nonlinear stiffness of SIP and the types of excitations. Finally, the influence laws of the equivalent linear stiffness coefficient and the responses on the external loads are studied. The equivalent linear stiffness and the responses are increases with increasing of the external loads. The investigations in this paper provide a theoretical basis for the researches of the acceleration response of tile, dynamic strength of the SIP and the dynamic integrity of the TPS.

Key words

thermal protection system / random vibration / theoretical model / dynamic behaviors / dynamic strength

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HUANG Jie1，YAO Weixing1,2，SHAN Xianyang3. Single degree of freedom dynamic theoretical model for a thermal protection system[J]. Journal of Vibration and Shock, 2019, 38(2): 98-104

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