关键词: 数字孪生, 航天器舱门, 展收机构, 根铰间隙, 材料参数, 近似模型, 优化设计

Abstract: To improve vibration caused by clearance of root-joints during the process of the spacecraft hatch deployment,a material parameters optimization method using digital twin and Radial Basis Functions (RBF) model was proposed.The dynamic model of clearance was established,and then the digital twin model of hatch was constructed by using digital twin technology.The contact stiffness coefficient,damping coefficient and dynamic friction coefficient of the root-joints' material were taken as the design variables,and the maximum angular acceleration as the optimization objective to build the sample space with the optimal Latin hypercube experiment design.The approximate model was constructed based on radial basis function neural network model.The combined Sequential Quadratic Programming Algorithm (SQP) and Multi-Island Genetic Algorithm (MIGA) was applied to calculate the optimal design.The optimization results indicated that the peak angular acceleration of hatch and the contact force of root-joints were significantly reduced compared to original,and the dynamic performance of the hatch was improved.

Key words: digital twin, spacecraft hatch, depleyable mechanism, root-joints clearance, material parameters, approximate model, optimization design