Considering the nonlinear deformation of a patented Diameter-Variable Wheel of lunar rover in process ofchanging diameters, a FE(Finite Element) model which taking geometric stiffness into account was built throughFEMBS (the interface with Finite Element software-Ansys and Multibody System software-Simpack). Based oncontinuous impact theory, rigid-flexible coupling dynamics simulation of the Diameter-Variable Wheel with sixflexiblebodies was carried out by adding moved markers. Then two simulation models were set up respectively fordifferent ways of changing diameter, and the comparative results were given. These studies provide the basis forfatigue life analysis and load verification.
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