Topology optimization and lattice lightweight design of the Outsole of the return tank considering compound working conditions

Abstract

On the premise of satisfying the safety of landing impact, the realization of lightweight design of the spacecraft return module is one of the key issues. Aiming at the lightweight design of the spacecraft return capsule under different conditions of hard landing, from the perspective of structural topology optimization calculation, the problem is studied and given based on the dynamic topology optimization of the Hybrid Cellular Automata (HCA) algorithm. The specific design plan is based on the LS-DYNA platform, and the dynamic impact topology optimization model of the return cabin under different working conditions is established. After analysis, the optimal material distribution and stiffener layout plans on the outsole structure was determined, and the conceptual design model of the outsole was obtained. Then use the body-centered cubic lattice structures to fill different areas of the outsole,and combine the size optimization technology to obtain the final lightweight outsole design plan. Compared with the traditional rib-skinned outsole structure, the design meets the safety requirements of hard landing while reducing the weight ratio to 24%. It demonstrates the dynamic topology optimization method based on the HCA algorithm in the lightweight design technology of the spacecraft return capsule. The feasibility and superiority in the additive manufacturing lattice lightweight designs method.