Analysis On Landing’s Buffer And Stability Of Lander Based On ADAMS

Our lunar exploration project includes three periods，"roll""fell" and "back". Thesoft landing on lunar surface,which is one of the eminently important goals and tasks,are realized in the second and third period. Whether the project can be succeed or notdepends on the lander’s anti-buffer mechanism，landform of landing surface and theselection of landing’s initial condition. Therefore, this paper mainly analyse the lander’ssimulate landing process and its stability according to the domestic and foreignrelevant information, the theoretical analysis, the test and some numerical simulationto obtain the design paramenter of landing’s anti-buffer mechanism and initialcondition of safety landing.This paper firstly established the dynamics simulation model of the Lord bufferleg and the auxiliary buffer legs based on the aluminum honeycomb’s compressibilityand platform features, which confirms the correctness of buffer leg model. Secondly,the entire lander-rigid moon surface contact simulation model was established based onthe Colomb friction theory, CONTACT searching algorithm and the polydynamicstheory. Then, according to the characteristics of lunar soil’s engineering mechanics, theauthor made a comparison with Armstrong footprints and got the lunar soil mechanicsparameters, then built the constitutive model of lunar soil. Afterwards, the author set upthe ADAMS process of lunar soil with the usage of Fortran. With the combination ofCONTACT searching algorithm we’ve mentioned hereinbefore, this paper establishedthe entire lander-flexible lunar soil contact simulation model. Besides, this paperproposed the modificatory stable Taper Angle method and the judgement rule oflander’s landing stability based on the Papadopoulos’ force-angle stability measurement.With the judgement rule, the author did analysis of numerical simulation for all kindsof limited conditions during the soft landing process and got the rigid and soft lunarsoil landing surface. The most severe condition appears when horizontalvelocity is1m/s, angular velocity is1°/s, attitude angle is4°.Meanwhile, this paper got thehorizontalvelocity of lander in every yaw angle, having the stable boundary curveformed by horizontalvelocity and yaw angle, afterwards, came to the conclusion thatwhen yaw angle is22.5°,we got the most severe condition. The above research resultscan provide guidance for the lander buffering mechanism’s design, the selection of softlanding’s lunar surface environment and initial condition’s realization, and some other similar engineering’s design.