Research on internal dynamic excitation and vibration response of eccentric fault gear system
An approach to calculate internal dynamic excitation of gear system with the eccentric fault is developed taking the urban rail transit with smaller radius of curve driving gear system in the mountainous area for example.Firstly,the gear geometry model with eccentric fault is established.The frictional excitation force of the gear pairs is calculated dividing the contact lines of helical gear pairs under eccentric fault into two sections taking the pitch point as the boundary.The influence rule of the gear pair eccentric fault on friction excitation is obtained.Then,a multi-degree-of-freedom lumped mass dynamic model of gear system with eccentric fault is established and the dynamic meshing force is obtained.Last,taking the dynamic meshing force as the internal dynamic excitation,the vibration characteristics of gear system are studied by means of modal superposition method.The comparison analysis of calculational and experimental results is carried out.The result shows that the simulation result is in good agreement with the experimental result.The frequency domain components of dynamic response with eccentric fault are more closely related to the test result.In fact,the study result would provide a theoretical basis for the early eccentric fault monitoring of the gear system.
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