The stiffness analysis was investigated with the geometric relations of deployment and stowage.And the local and whole stability analyses were also studied with stability theory. 根据展开和收拢几何特性关系，对其刚度特性进行了分析，并依据弹性稳定理论，对该展开机构进行了局部和整体稳定性分析。
The fractal dimension is one of the geometric characteristics of microcellular structure of foamed PP and exhibits the foamability of PP under a certain foaming condition. 分形维数是发泡聚丙烯微孔结构的几何特性之一，体现了聚丙烯在特定条件下的发泡能力。
