Impact Analysis of Lunar Lander Soft Landing Performance Caused by the Body Gravity Centerline Shift

Abstract

In order to obtain the lunar lander soft landing performance impact caused by the body gravity centerline shift, a seven-degree-of-freedom dynamic model is established based on the inertia force, and a dynamics and kinematics equation is deduced. The dynamic model was verified by the lunar lander scale model and soft landing impact experimental platform. Soft landing performance effects caused by the lander body gravity centerline shifts are analyzed according to the displacement of the body, the body overload, primary/secondary pillar load, and buffer processes. The research results show that the gravity centerline shift has a significant influence on the lunar lander soft landing performance; when the lunar lander lands on the lunar slope—in a downward direction along the slope—the appropriate shift of the position of the gravity centerline can effectively improve the soft landing performance and stability.