【正】The Beijing Institute of Space Mechanics and Electricity,CAST completed the first phase tests of the landing stability testing for the 3rd phase of the Lunar Exploration Project.The tests fully verified the impa...【正】The Beijing Institute of Space Mechanics and Electricity,CAST completed the first phase tests of the landing stability testing for the 3rd phase of the Lunar Exploration Project.The tests fully verified the impacts on the Chang’e 5 probe landing stability of the landing initial parameters of the simulator in 8 working states and 18 operating modes,landing surface terrain and mechanical param-展开更多
利用光滑质点动力学SPH(Smoothed Particle Hydrodynamics)方法对Whipple防护结构在空间碎片超高速碰撞下的物理过程进行了数值模拟.在数值模拟中,为了充分发挥SPH方法和有限元方法FEM(Finite Element Method)的优点,利用有限元单元和SP...利用光滑质点动力学SPH(Smoothed Particle Hydrodynamics)方法对Whipple防护结构在空间碎片超高速碰撞下的物理过程进行了数值模拟.在数值模拟中,为了充分发挥SPH方法和有限元方法FEM(Finite Element Method)的优点,利用有限元单元和SPH节点混合建模,将有限元单元和SPH节点(SPH nodes)通过定义接触条件相结合,在大变形和飞溅区域采用SPH节点建模,而小变形区域则采用有限元单元建模,从而大大节省求解时间,提高计算效率.计算结果表明,弹丸在穿透前板后,形成二次碎片,碎片云经膨胀和拉长,对后板造成轻微的损伤,这和文献的相关试验数据是符合的.利用SPH方法对空间碎片的超高速碰撞过程进行数值模拟,不仅很好地预测了Whipple防护结构的破坏情况,而且对整个碰撞过程,包括碎片云的形成、膨胀和拉长过程都有形象的描述,符合超高速碰撞的试验测试结果.展开更多
文摘【正】The Beijing Institute of Space Mechanics and Electricity,CAST completed the first phase tests of the landing stability testing for the 3rd phase of the Lunar Exploration Project.The tests fully verified the impacts on the Chang’e 5 probe landing stability of the landing initial parameters of the simulator in 8 working states and 18 operating modes,landing surface terrain and mechanical param-