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Chinese Journal of Space Science ›› 2015, Vol. 35 ›› Issue (4): 486-494.doi: 10.11728/cjss2015.04.486

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Method on Calculation of Lunar Soil Particles Trajectories Considering Collision Effect

ZHENG Gang1, CUI Yuhong1, YU Wei2, REN Depeng2, YE Qing2, GENG Dongliang2   

  1. 1. School of Mechanical Engineering, Tianjin University, Tianjin 300072;
    2. China Academy of Space Technology, Beijing 100094
  • Received:2014-07-26 Revised:2015-04-14 Online:2015-06-15 Published:2015-06-30

Abstract:

Regarding to the trajectory and mass distribution of lunar soil particles which are lifted by the lunar lander during the descending stage, a method considering the particles' collision effect is proposed. Based on the law of mass and energy conservation, the speed of regolith particles after collision is determined, and through the iterative calculations of fluid-structure interactions, the mass distribution caused both by collision effect and lunar lander effect on the lunar soil particles is presented. Through the measured data from the US Apollo 11 descending and landing on the lunar surface, the method are tested and verified by the numerical simulation. The analysis result shows that after the regolith particles colliding with each other having been considered, their trajectories have a more obvious tendency to spread. Furthermore, after the collision energy loss having been considered, the tendency to spread of regolith particles is weakened. And the smaller the coefficient of restitution is, the lower the raising height of the lunar soil particle will be.

Key words: Regolith particles, Collision, Trajectory, Energy loss

CLC Number: