小行星探测器附着碎石层的稳定性分析方法

The stable attachment of asteroid detector to star surface is key to exploration mission. Here, a kind of asteroid detector was taken as the study object, and a coupled simulation model was established by combining the discrete element method and the multi-body dynamic simulation method considering both actions of buffer mechanism and gravel layer impact to analyze attachment stability of asteroid detector on gravel layer. Then, comprehensive evaluation parameters of attachment stability of the detector were given. Furthermore, the attachment stability of the detector was analyzed with the coupled simulation model for typical attachment conditions. Under the specific vertical speed, sample points were chosen with the full factors test design method. Based on calculation results of the coupled simulation model, third-order polynomial was used to establish surrogate models of performance evaluation parameters for different gravel layer slopes, detector horizontal speeds and yaw angles. Surrogate models were used to determine the attachment stability boundary of the detector, and analyze the change trend of the stability boundary under different working conditions. Finally, according to analysis results of stability boundary, 3 groups of severe attachment conditions were determined, and then effects of vertical velocity on attachment stability were analyzed. It was shown that the proposed study method can have a certain guiding significance for successful development of our country's asteroid attachment detection missions in future.