Configuration Optimization of Landing Gear under Two Kinds of Landing Modes

The dynamic simulation models of a lander under two kinds of landing modes, namely, shutdown at the specified height landing mode and shutdown at the touchdown landing mode, are established. Based on the simulation models, the soft landing performance of the lander under two kinds of landing modes is analyzed by full factorial design, and the worst landing conditions are obtained. In order to get the optimal soft landing performance of the lander, the influence of the configuration parameters of the landing gear on the soft landing performance is studied. Aiming at worst landing conditions, the sampling points are obtained by using the simulation models and experiment design method, and the response surface models which reflects the mapping relationship between the configuration parameters of the landing gear and the values reflecting the soft landing performance are established. Then the configuration parameters of the landing gear are optimized based on the response surface models and the non-dominated sorting genetic algorithm II (NSGA-II). Finally, the simulation is carried out under two kinds of landing modes by using the optimized parameters. And it shows that both the ability of the lander to resist being overturned and the ability of the bottom of the lander to resist being damaged are enhanced.