关于柔性航天器动力学模型降阶问题

On the Order Reduction of Dynamics Models of Flexible Spacecrafts

针对柔性航天器动力学模型的降阶问题 ,综述了动力学建模中几种常用的模态集 ,介绍了用于选择系统保留模态的有关准则。通常的模态价值分析和内平衡理论是用于航天器系统模态的选取 ,而不是直接用于动力学建模时的部件模态或系统结构弹性变形模态的选取 ,因而存在如何应用上述准则于动力学建模的问题。为此 ,提出了一个动力学建模时的降阶策略 ;还提供了一个数值例子 ,以对采用不同的模态集建模时的结果进行比较 ,并表明如何采用上述准则于航天器的动力学建模。

The usual mode sets for the dynamics modeling of flexible spacecraft are reviewed. Some mode reduction criterions for the selection of system retained modes are summarized. It is pointed out that the modal cost analysis and the internal balance theory are for the system mode selection and there is the problem how to use these criterions for the component elastic mode or the system elastic deformation mode selection. A tactic for using the order reduction criterions for the dynamics modeling is introduced. An example is given to show the comparison of modeling results with different mode sets and to illustrate how to use the mode reduction criterions for the dynamics modeling of flexible spacecraft. [