M/OD Risk Assessment System and Its Applications

A risk assessment system named meteoroid & orbital debris risk assessment system (MODRAS) developed for assessing risks of the spacecraft under the meteoroid and debris environment (M/OD EM) is presented.The computing resolution of MODRAS has been verified by both the three generic spacecraft geometries of inter agency debris committee (IADC) and similar foreign software such as BUMPER,ESABASE,and MDPANTO.The results show that the system is fit well with the computing results of the foreign software.Typical applications of the system are also presented,including a manned spacecraft and a space shuttle.     

高速碰撞下航天器防护结构效能评价

采用AUTODYN-2D无网格SPH数值技术,对球形铝弹丸正碰撞整体式结构、Whipple、双层铝及填充式(SW)防护结构的作用行为进行了数值模拟.结果表明,在相同面密度条件下,填充式防护结构抗空间碎片的效能最佳,Whipple防护结构较差,双层铝防护结构介于两者之间,整体式结构最差.     

Corrugation Stuffed Shield for Spacecraft and Its Performance

With the increasing number of orbital debris andspace environment continuing to deteriorate,mete-oroid and orbital debris(M/OD)have become a realthreat for space missions.So interest in the problemof M/OD has increased dramatically in the world.Based on observations,the population of orbital debrislarger than1cmin diameter is more than110thou-sand,larger than1mmin diameter is more than35million,andit will be continuing to increase5%an-nually[1].Hypervelocityi mpact of orbital debrislarg-er t…     

航天器防护结构弹道极限数值模拟

采用AUTODYN-2D无网格SPH数值技术, 对遭遇速度为(2～11)km/s条件下球形铝弹丸正碰撞Whipple防护结构的弹道极限(临界弹丸直径)进行了数值模拟.结果表明,数值模拟结果与实验值相当吻合,且弹道极限随碰撞速度增大呈现为三种不同的变化趋势.当碰撞速度V≤3km/s或V≥7km/s时,临界弹丸直径随碰撞速度增大而减小;当3km/s<V<7km/s时,临界弹丸直径随碰撞速度增大而增大.     

空间碎片在轨碰撞数值模拟

采用AUTODYN-2D无网格SPH数值技术，对碰撞速度10km／s下的球形及柱状空间碎片在轨碰撞超高速作用行为进行数值模拟，给出了不同节点处的速度变化规律．数值模拟结果表明。空间两物体碰撞后所形成碎片云主要分布在原碰撞物体运行轨道周围，运动方向与原来碰撞物体的速度方向相同；发生碰撞的空间物体形状强烈影响碰撞后碎片云的分布及速度；球形碎片碰撞柱状碎片形成的碎片云速度最大；柱状碎片相撞后碎片云呈椭球形分布．