Research On The Cushioning And Manipulation Of The Cat-like Landing Legs Of A Lunar Module

As one of the important structures in lunar modules,the cushion landing structure plays a vital role in the landing process.The cushion landing structure guarantees the safety of the equipment and astronauts.The traditional design can not meet the new lunar exploration needs because of its fixed parameters and poor adaptability.Therefore,designing a new type of cushion landing structure has very important engineering significance.Nowadays,bionic design is gradually applied to various aspects.Under these circumstances,a cat-like soft landing buffer mechanism is designed.And the buffer performance is analyzed under different landing conditions.In addition,landing control strategies are given for different landing conditions.To satisfy the requirements of soft landing,a new cushion landing structure for the lunar module is designed.The main structure refers to the skeletal structure of the cat’s hind legs.The cushioning material uses a "three-element" bionic muscles.Refering to the mechanical characteristics of the cat’s hind leg muscles during landing,the arrangement of the bionic muscles is obtained.According to the actual landing situation of the lunar module,the specific parameters of the structure are given.And the equivalent model for simulation is established.Different with the traditional cushioning device,three-part design is used.The energy is absorbed step by step,and the whole cushioning process is more smooth.By using simulation methods,the cushioning performance in the vertical direction is studied.And the acceleration time curve,displacement time curve,velocity time curve and energy absorption characteristics of the device are obtained.Compared with the traditional device,cushioning performance of the bionic design in the vertical direction is much better.By simulating under different initial joint angles and damping values,cushioning performance under different design parameters is obtained.The acceleration response and energy absorption of the cushioning mechanism under different slopes and different horizontal speeds are also studied.And the results show that the soft landing mechanism has stable cushioning performance on the vertical direction,but it has difficulty to restrain the horizon speed.In order to solve this problem,the control strategies for landing on a slope and landing with horizon speed are respectively given.The buffer mechanism was simulated under given control strategies.The results show that the horizontal speed is obviously reduced and the given control strategies can effectively increase the stability of landing.