Touchdown dynamic modeling and simulation of lunar lander
In this paper, the key influences of lunar lander landing model are illuminated systematic. Then the touchdown dynamic model of lunar module is built. And the simulation model for lunar landing described on ADAMS is discussed. As an example, one kind of lunar module model with four cantilever truss style landing gear is built by ADAMS and the simulations are focused on the influences on landing by the characteristics of buffers in primary and secondary struts of the landing gear. The conclusions can be used for the design of lunar lander.
A MATHEMATICAL PROCEDURE FOR PREDICTING THE TOUCHDOWN DYNAMICS OF A SOFT-LANDING VEHICLE
A mathematical procedure for predicting the touchdown dynamics of a soft-landing vehicle is presented. The vehicle is idealized as a pseudorigid structure to which a landing gear system is attached. The landing gear system is made up of telescoping struts which house shock-absorbing mechanisms and connect the vehicle structure with footpads that contact the landing surface. The forces acting on the idealized vehicle during landing are from the vehicle landing gear system, the reaction control system, the descent-stage rocket engine thrust, rocket-engine-nozzle-crushing loads, and grav- ity. Forces acting on footpads are due to forces from the landing gear struts and from the landing surface. gear system are approximated by assuming that the structure deforms linearly with the applied load. 1/6-scale lunar module model. The elastic properties of the vehicle structure and of the landing Correlation between analytical and experimental data is presented for a Conclusions from these data are presented.
Studies of touchdown stability for lunar landing vehicles
Touchdown stability tests for lunar landing vehicles - symmetrical & asymmetrical inelastic impacts