Vibration Analysis on the Deployable Eight-wheel Lunar Rover with the Torsion-bar and Rocker Structure

The random vibration from the lunar ground roughness inputs and the forced vibration from the deployed drive source work together on the eight-wheel lunar rover with the torsion-bar and rocker structure when it deploys.For the convenience of establishing a vibration model,the two coupled ground roughness inputs are transformed into one independent ground roughness input equivalently,according to the structural characteristics of the eight-wheel lunar rover with torsion-bar and rocker structure.And based on the transformation,the 11 DOF differential equations of the vibration system are established and solved with Fourier transformation and decoupling.The amplitude-frequency characteristic curve of the bodywork vibration,the amplitude-frequency characteristic curve of vibration acceleration and the relation curve between the root mean square of the suspension flexibility and damps when the stiffness is constant are drawn by Matlab.The various characteristics of the bodywork vibration response and the vibration acceleration in three orientations are analyzed.The logical range of damp value with fixed system stiffness and the theory gist for improving farther design are brought out.