Analysis of Quasi-three-dimensional Landing Dynamics and Attenuation Performance under Extreme Conditions for Launch Vehicle

doi:10.3901/JME.2021.21.022

Abstract

Abstract: In order to improve both the accuracy and efficiency of landing dynamic analysis under multiple conditions for vertical landing reusable launch vehicle, a quasi-three-dimensional model under symmetric landing modes is established considering main-body in-plane motion, footpad space motion and strut side load simultaneously. The model also incorporates the hydraulic attenuation force based on lumped parameter method, the slip-static friction force with Stribeck effect, and the nonlinear normal contact force. Based on above model, a landing dynamic analysis program for launch vehicle is developed, and seven extreme landing conditions regarding tilt angle, structural overload, attenuation stroke, strut force and rebound height are obtained by employing both the radial-basis-function surrogate model and the simulated annealing optimization method. The dynamic responses under these conditions are then analyzed, and the influencing rules by landing conditions on dynamic responses are attained. The results show that the structural overload reaches maximum when all struts touchdown simultaneously. Besides, the tilt angle gets maximum under 2-2 landing mode, while the strut load and rebound height reach maximum under 1-2-1 landing mode.

Key words: launch vehicle, landing dynamics, lumped parameter method, attenuation performance

CLC Number:

TP271

YUE Shuai, LIN Qing, DU Zhonghua, NIE Hong, ZHANG Ming. Analysis of Quasi-three-dimensional Landing Dynamics and Attenuation Performance under Extreme Conditions for Launch Vehicle[J]. Journal of Mechanical Engineering, 2021, 57(21): 22-33.

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