Research On Buffer Performance Of Softlanding Buffer Device Of The Lunar Dectetor

Exploiting and using the moon make great sense to human evolution. At present, the main countries in the domain of space exploration have put their own schemes of exploring the moon into practice, and raise a new round of upsurge of lunar exploration. China also startup a lunar exploration program named"Chang'e Project"which will be divided into three stages:"circling, landing and returning". Nowadays, our country has successfully sent up its first lunar detector, and achieved orbiting the moon, but carrying out the second target, a series of key technologies should be resolved, containing softlanding. Therefor, it is necessary to make an investigation about the soft landing technology of lunar lander, and this will be very meaningful and useful to lunar exploration program and even the future deep space exploration of China.In this paper, the current domestic and overseas state of research in the lunar module's softlanding subsystem is mainly presented. The commonly used soft landing cushion devices and the domestic and international mainstream landing impact simulation softwares are described. The dectetor's landing process mathematical model is completed, and the important parameters of the cushioning material within the detector are determinated.Based on the demanding of the second stage in"Chang'e Project", and combined with cushioning devices'characteristics, aluminum honeycomb is chosen as a buffer material, a finite element model of aluminum honeycomb is established, and simulation analysis of impact is carry out for studying the buffer performance of aluminum honeycomb. The research indicates that, the Selected aluminum honeycomb can absorb impact energy well, and it satisfies the mission requirements. The physical and mechanical properties of lunar soil are introduced, and a finite element model of lunar soil is established. The mechanical properties are analyzed using constitutive model of Dytran's own soil material. Also, according to researches overseas, the elastic-plastic constitutive model is established to simulate monthly soil material.The landing impact analysis is carried out under the given boundary conditions, using single leg landing simulation model which is established combined aluminum honeycomb model and lunar soil model with the landing leg model. The results verify the correctness of the modeling method. A full landing simulation model is established to carry landing simulation analysis which the four legs land at the same time. The relationships are gotten about the cushioning over loading versus time, the cushioning velocity versus time, the cushioning stride versus time and the energy versus time through the simulation, based on the environment in the moon; the landing model which the body is rigid is established to conduct study on the influence of the flexible deformation of the body on the landing performance, and the result of simulation is compared with the one body is flexible. The survey results indicate that the chosen landing project can ensure the detector land on the surface of the moon safely, while the flexible deformation of the module, which can induce high frequency oscillations, will seriously affect the landing performance.,and should be noted in the design stage.