The dynamic equation of spacecraft with extensional flexible appendages is derived. 推导了带伸展柔性附件航天器的时变系数动力学方程。
The physical foaming process of foamed Aluminum is described, and the dynamics equation is gained and simplified. 摘要描述了泡沫铝发泡的物理过程，建立起了动力学方程，并对动力学方程进行了简化。
