| In July 1969,NASA Apollo 11 spacecraft successfully landed on the moon,and human beings stood on the moon at the first time.Subsequently,the United States continued to carry out several manned missions to the moon,and obtained a large number of lunar solid samples and scientific data.In 2004,China's space agency formally launched the lunar exploration project,named Chang 'e project which is divided into three stages: the first stage,unmanned lunar exploration,the second one,manned lunar landing and the last one,establishment of a lunar base.The first stage has been completed and the second stage is being prepared.A new bionic soft landing mechanism is proposed to meet the strategic goal of developing lunar resources and establishing lunar base.This dissertation combined the biomechanical characteristics of the cat which is good at jumping and the idea of bionic robot to imitate cat's muscle leg structure.This dissertation proposes a new bionic mechanism model to achieve a soft landing mechanism which pneumatic muscle is the main energy absorption material and aluminum alloy is skeletal.The cat soft landing buffer mechanism model is established by ANSYS/LS-DYNA,and verified the feasibility with the existing traditional lunar lander by finite element simulation analysisOtherwise,the relationships between the joint angles structure and the buffer performance of soft landing mechanism are analyzed and demonstrated in this dissertation.Finite element method is used to analyze the different joint angle models.The relationships between the different joint angles and the buffering performance of soft landing mechanism are analyzed qualitatively by comparing the simulation results.In addition,this dissertation also discusses the performance of soft landing mechanism under different PAM lengths,and analyzes the influence between different muscle lengths and the performance of soft landing mechanism according to the numerical simulation results. |
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