一种柔性簇状卫星动力学并行仿真方法

A parallel simulation method of flexible clustered satellite dynamics

具有柔性中心体及多个柔性附件的簇状卫星动力学仿真需使用大量模态数据进行动力学计算,计算量大。经典方法通过模态截断及动力学方程化简进行建模,难以满足高精度仿真需要。提出将端口方程形式的柔性附件动力学方程与中心体柔性动力学方程直接组集,设计并行仿真算法,提高仿真速度。所提出算法计算复杂度随卫星柔性部件数量增长具有对数增长规律。仿真结果证明这种算法并行效率随模型中柔性附件数量及柔性模态数量增长而提高,适用于柔性簇状卫星并行仿真。

Dynamic simulation of clustered satellite with flexible center body and flexible appendages needs performing dynamic calculations with large modal sets which lead to high computation cost and low efficiency.Classical modeling methods deal with this problem by equation simplification and modal reduction which make it hard to satisfy the need of high precision simulation.An algorithm which assembles port equations of flexible appendages and dynamic equation of flexible center body directly is proposed to enable parallel simulation and boost simulation speed.Computational complexity of the proposed algorithm is proved to follow a logarithmic increase with respect to the number of flexible appendages.The simulation results show that parallel simulation efficiency grows with the increase of mode number used in flexible body model and the number of flexible appendages,which has made the algorithm suitable for the parallel simulation of flexible clustered satellite.