基于超高速碰撞仿真的卫星碰撞解体碎片分析

使用超高速碰撞数值仿真技术,结合自主开发的碎片识别统计方法,以Iridium33与Cosmos2251卫星在轨撞击解体事件为例,进行了在轨卫星碰撞解体碎片分析.通过有限元方法(FEM)与光滑粒子流体动力学(SPH)的复合算法,从图形角度识别出碎片云中的大碎片,然后利用二值图转换与二值图连通域的快速统计,提取出了碎片数目...

Debris Analysis of On-orbit Satellite Collision Based on Hypervelocity Impact Simulation

Debris analysis method of on-orbit satellite collision is presented in this paper. Hypervelocity impact simulation technique and self-developed fragment identification and statistics method are applied to analyzing fragmentation process of Iridium33 and Cosmos2251 collision as an instance. Using a combined method of finite element method (FEM) and smoothed particle hydrodynamics (SPH), large fragments are identified from the debris cloud. Then with binary image conversion and statistics of connectedness regions on the image, the amount, size, position, velocity and mass of each fragment are determined. Simulation results show that most large fragments are generated from Cosmos2251 and the quantity of fragments is in agreement with space surveillance network (SSN) observation data, which shows the effectiveness of the proposed method. Most materials in the normal impact region are converted into small fragments after the impact while the large fragments are from materials far from the normal impact region. To measure the degree of spall, equivalent normal impact mass is defined. The computation results show that the total mass of either large or small fragments is only determined by equivalent normal impact mass despite various impact locations.