Modeling and Dynamic Characteristic Analysis for Longitudinal Coupled Vibration of Liquid Rocket

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Journal of Vibration and Shock ›› 2014, Vol. 33 ›› Issue (24) : 71-76.

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Modeling and Dynamic Characteristic Analysis for Longitudinal Coupled Vibration of Liquid Rocket

HAO Yu1 XU Deyuan1 YANG Qiongliang2 LIU Jinfan2 LIU Zhengyong2 TANG Guoan1

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Abstract

For the problem of structure-propulsion coupled longitudinal vibration of a liquid-propulsion launch vehicle, dynamic model of each component of the propulsion system is established in time domain. Governing equation of the coupled system is deduced in the form of second-order linear differential equation. With this method, all eigenvalues of the coupled system can be obtained quickly, and their sensitivities with respect to physical parameters of the accumulator and pump can be calculated easily, providing technique method for optimization of liquid rockets.

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liquid-propulsion launch vehicle / propulsion-structure coupled vibration / sensitivity analysis

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HAO Yu XU Deyuan YANG Qiongliang LIU Jinfan LIU Zhengyong TANG Guoan. Modeling and Dynamic Characteristic Analysis for Longitudinal Coupled Vibration of Liquid Rocket[J]. Journal of Vibration and Shock, 2014, 33(24): 71-76