&nbsp;Sea Launch Dynamics in Rough Sea Condition Considering Strain Rate Effects

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (12) : 312-321.

AERONAUTICS AND ASTRONAUTICS

Sea Launch Dynamics in Rough Sea Condition Considering Strain Rate Effects

WANG Deng，SHAO JianShuai， LI MingJun，YAN Song，JIANG Yi

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Abstract

Launch vehicle sea launch is a complex and nonlinear system. With relative motion between the launch vehicle and frame-type launcher, nonlinear and discontinuous impact loads between the adapter and guide rail occur at different speeds. Evaluating the strain rate effects of the adapter model is crucial. In this paper, we developed an improved phenomenological macro model based on polyurethane foam experimental data to accurately capture the system dynamics. We established two dynamic models of the sea launch system, one with and one without considering the strain rate effect of the adapter, and studied the dynamic characteristics of the launch vehicle during sea launch under high sea conditions. The results indicate that the strain rate effects have a significant impact on the contact load between the adapter and guide rail and the rolling motion law of the sea launch. This directly affects the safety assessment and design of the rolling limiting device for sea launch. Overall, the research provides important insights into the engineering and theoretical aspects of launch vehicle sea launch, highlighting the requirement to consider the strain rate effects of the adapters in sea launch dynamics modeling and safety assessment.

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WANG Deng, SHAO JianShuai, LI MingJun, YAN Song, JIANG Yi. Sea Launch Dynamics in Rough Sea Condition Considering Strain Rate Effects[J]. Journal of Vibration and Shock, 2024, 43(12): 312-321

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