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Multibody simulation and descent control of a space lander

  • Pagani, A. (Mul2 group, Department of Mechanical and Aerospace Engineering, Politecnico di Torino) ;
  • Azzara, R. (Mul2 group, Department of Mechanical and Aerospace Engineering, Politecnico di Torino) ;
  • Augello, R. (Mul2 group, Department of Mechanical and Aerospace Engineering, Politecnico di Torino) ;
  • Carrera, E. (Mul2 group, Department of Mechanical and Aerospace Engineering, Politecnico di Torino)
  • Received : 2019.02.12
  • Accepted : 2019.09.15
  • Published : 2020.03.25

Abstract

This paper analyzes the terminal descent phase of a space lander on a surface of a celestial body. A multibody approach is adopted to build the physical model of the lander and the surface. In this work, a legged landing gear system is considered. Opportune modelling of the landing gear crashbox is implemented in order to accurately predict the kinetic energy. To ensure the stability of the lander while impacting the ground and to reduce the contact forces that arise in this maneuver, the multibody model makes use of a co-simulation with a dedicated control system. Two types of control systems are considered; one with only position variables and the other with position and velocity variables. The results demonstrate the good reliability of modern multibody technology to incorporate control algorithms to carry out stability analysis of ground impact of space landers. Moreover, from a comparison between the two control systems adopted, it is shown how the velocity control leads to lower contact forces and fuel consumption.

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