Abstract
In this article, the design on the shock absorber of the lunar probe soft landing can be considered as a single- or multi-objective optimization problem. Here, the optimized objective parameters include the maximum toppling stability, defined as Dmin, and the minimum stroke of primary strut energy absorption, SPmax. However, the two optimized variables are conflict objectives. In order to give an overall consideration about the multi-performances of landing, the multi-objective optimization strategy is proposed and nondominated sorting genetic algorithm II is employed to find the best decision parameters of the shock absorber design. To conduct the optimizations, firstly, the worst landing cases and safety boundaries for both toppling and primary strut energy absorptions are obtained by the computer simulation experiments. Both single- and multi-objective optimizations are then implemented aiming to expand the stability boundary. The results show that the landing stability is effectively improved after optimizations, and also demonstrate that the multi-objective optimization strategy is superior to that of the single-objective optimization.
Highlights
The Moon, as the nearest celestial body to the Earth, has become increasingly attractive for space scientists because of its abundant natural resources and high potential as a future territory.[1]
Tactile sensor is currently introduced and progressive research has been performed on it in the study by Liu et al.,[2,3,4,5] its information is processed by various learning algorithms
The aluminum honeycomb is always selected as the shock absorber because of its ease of use and reliability
Summary
The Moon, as the nearest celestial body to the Earth, has become increasingly attractive for space scientists because of its abundant natural resources and high potential as a future territory.[1]. Researchers have dedicated to develop mathematical models for soft-landing dynamics simulation about the legged-type lunar lander in the past decades.[11,12,13,14,15] In addition, analysis of landing stability has received great interest in the literature.[16,17,18,19,20,21,22,23] On the hardware side, to achieve a successful soft landing, the landing gear must provide sufficient energy absorption capability and must prevent the landing vehicle from toppling.[24] The aluminum honeycomb is always selected as the shock absorber because of its ease of use and reliability.
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