The rigid-flexible coupling system with a hub and concentrated mass is studied in this paper.Considering the second-order coupling\nof axial displacement which is caused by transverse deformation of the beam, the dynamic equations of the system are established\nusing the second Lagrange equation and the assumed mode method.The simulation results show that the concentrated mass mainly\nsuppresses the vibration and exhibits damping characteristics. When the nondimensional mass position parameter
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