| Exploitation and utilization of the moon make great sense for the development of human beings. Nowadays, the main countries in the domain of space exploration have put their own schemes of exploring the moon into practice. Whether the lunar lander can successfully land on the moon surface is the critical problem in the whole Lunar Exploration Program. Therefore, it is necessary to make an investigation about the soft landing technology of lunar lander, which is very meaningful and useful to Lunar Exploration Program and even the future deep space exploration in China.The applications of the honeycomb and MR (magneto-rheological) bumper in lunar lander soft landing system are researched in this paper. Firstly, the buffer characteristics of the honeycomb are studied, and the approximate curve of stress versus strain and corresponding performances when impacting are gotten, which provide the foundation for the choosing and calculation of the honeycomb style in honeycomb buffer. Secondly, the current state of research, the mechanism, material composition and characteristics of the MRF are also presented. Through the calculations based on the common models of MRF dampers, its application in the domain of the lunar lander soft landing is researched.Based on the demanding of the second stage in"Chang'e Project", and combined with the buffer characteristics of the honeycomb and MR buffer, the relevant soft landing buffer is designed and analyzed. In the domain of the honeycomb buffer designing, with the typical honeycomb organ as an example, through making the finite element analysis in LS-DYNA, the original designing parameters of the lunar lander soft landing system are gotten in this paper, which make the foundation for the detail designing of the next step. In the domain of the MR buffer designing, firstly, the landing course of the lunar lander as the model with three degrees of freedom is simplified. Secondly, based on the Herschel-Bulkley model, the mathematics models about the electricity changing with the impacting velocity, and the changes about the buffer characters are deduced. Finally, the model, spoken about above, with the software MATLAB /SIMULINK are confirmed. The relationships are gotten about the cushioning over loading versus time, the cushioning velocity versus time and the cushioning stride versus time through the simulation, based on the environment in the moon. The research indicates that, through series connection of the two MR Bumper and the electricity controlling of them respectively, the aim of the lunar soft landing with two degree cushioning can be realized. All the researchs indicate that it is feasible to apply the honeycomb buffer and the MR buffer on the lunar lander. |
