考虑应变率效应的高海情运载火箭海上发射动力学特性研究

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, an improved phenomenological macro model was developed in this work based on polyurethane foam experimental data to accurately capture system dynamics. Two dynamic models of the sea launch system were established, one with and one without considering the strain rate effect of the adapter, the dynamic characteristics of the launch vehicle during sea launch under high sea conditions was studied. Results indicate that the strain rate effects have a significant impact on the contact load between the adapter and the guide rail and on 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.