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Torsional vibration analysis of Fastening structure based on finite element method

These Fastening structure with self-locking function mainly plays a role of fastening and connection, and widely used in transmission system of vehicle. Loosing failure of the fastening structure may be caused by the torsional vibration excitation brought by internal combustion engine, which has seriously effects on the safe operation and service life of vehicle transmission, and even leads to serious accidents. To understand this problem, a three-dimensional finite element model of the fastening structure is proposed to investigate effects of the pre-tightening force and the assembly clearance on the dynamic response of fastening structure, based on an explicit dynamic finite element method. The numerical results show that the axial displacement amplitude of the nut of the fastening structure increased gradually and the fastening structure has a slowly loosening trend, due to the action of the torsional vibration excitation, which can provide some suggestion to the fastening structure's reliability design.