Design And Research Of Landing Buffer Mechanism Of Lunar Module Based On Bionic Locust's Leg

In the manned lunar exploration activities,the lunar module is the most important core equipment.When the lunar module is in the landing process,it will hit the lunar surface with a certain speed.In the moment of crashing,the lunar module will endure a huge impact.If the impact load exceeds the capacity of astronauts and the overload of scientific instruments,it will seriously damage the equipment and personnel of the lunar module,leading to the failure of lunar exploration mission and even threatening the life of astronauts.Today,the design of the detector needs to be systematic,mechanized and automatic.The traditional design scheme of the structure cannot meet the needs of the advanced deep space exploration.The design and control of the bionic robot are becoming mature.It is also the future development direction to apply the bionics robot technology to the design of the aerospace structure.In this paper,a new type of cushion landing structure is designed,and the simulation analysis is carried out by combining the structural characteristics of locust leg.Locusts have excellent jumping ability,with little energy they can jump as high as 30 cm and as long as 70 cm,and after each jump can be a smooth landing,which has a very good landing buffering performance.By analyzing the leg structure and landing strategy of locusts,a kind of bionic locomotive lunar landing module is proposed with the actual structural parameters and working conditions of lunar module.The basic parameters such as mass,length and angle of the structure are given,and kinematics and dynamics model of the buffer structure are established.The equivalent model of the structure is determined by comparing the finite element model and the equivalent rigid model of the structure.The buffer capacity of the buffer structure in the vertical direction is the most basic performance of the buffer structure,the paper carried out a detailed simulation analysis.The acceleration response and energy absorption characteristics of the structure are obtained,and the maximum acceleration,maximum stroke and energy absorption index of the buffer structure at different landing speeds are analyzed.The relationship between the parameters and the buffer performance of the structure is analyzed by changing the key parameters of the buffer stiffness and the outstretched distance of the foot pad.Compared with the traditional acceleration structure of the landing structure,it shows that the performance of the bionic locust leg landing buffer structure is excellent.In practical work,it is necessary to consider the horizontal component of the velocity and the slope of the landing surface due to the disturbance of various factors and the nonsmoothness of the landing surface.The acceleration response and energy absorption characteristics of the lunar module in the landing mode "1-2-1" and the "2-2" landing mode were simulated by the landing leg grouping number of the landing structure.The maximum acceleration,maximum stroke,attitude angle and energy absorption ratio of the buffer structure under different horizontal components and different landing slopes are analyzed.The results show that the "2-2" landing mode is superior to the "1-2-1" landing mode considering the horizontal velocity and the landing slope.