In order to design a high-performance coaxial planetary gear reducer with dual power output,the assembly model,kinematic and dynamic analysis model of reducer are established,the time-variable stiffness excitation,error excitation and impact excitation of the mesh gears are calculated by the finite element analysis program of 3-D dynamic contact problem.Then the motion simulation,modal analysis and dynamic response of the reducer are completed and the speed curves of parts,the inherent frequency of reducer ...