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3 System Design of Lunar Lander
spacecraft. The effects of landing impact on equipments of lunar lander should be
analyzed to ensure the safety and reliability of equipments after landing. The load of
landing impact was transferred to structure by landing cushion mechanism. Most of
energy was absorbed by landing cushion mechanism while the residual energy would
be transferred to the main structure and equipments of lunar lander. The pattern of
force on the connection between landing cushion and main structure is shown in
Figs. 3.16, 3.17, and 3.18 for a specific condition by analysis and test.
Fig. 3.16 The X axis force to time curve on the connection between the main pillars of landing
legs with main structure when four landing legs touch the lunar surface simultaneously
Fig. 3.17 The Y axis force to time curve on the connection between the main pillars of landing
legs with main structure when four landing legs touch the lunar surface simultaneously