Topology optimization design and test verification of bracket under multi-load conditions

Abstract:
The spacecraft interface bracket shall have a special stiffness performance, the topological optimization technology based on the variable density method is introduced into the optimization design of the bracket structure in this paper. The topology optimization of the bracket is carried out by taking the total flexibility under multiple load conditions as the objective function and the volume as the variable parameter. First, the different load conditions of the interface and bracket are analyzed. Then, the initial model of bracket is established from the relative position relationship of the interface and the installation surface. Finally a bracket structure design method based on topological optimization and size optimization under multi-working load is proposed, by optimizing the designed bracket structure under multi- load conditions, the optimized model weight is reduced by 71% compared to the initial model, the base frequency is 1.48 times that of the design requirements. The bracket is simulated and analyzed under multiple loads by using finite element method, the maximum response stress is lower than the yield limit of the material used and meets the strength requirements. The interface position accuracy meets the requirements of the index after the test through the vibration test verification of the bracket. Therefore, this method is better used to optimize the design of the bracket under multi- load conditions.