| Popis: |
There have been many researches focusing on the vibration characteristics of gear faults, such as spalling, crack and broken, to improve the accuracy of fault diagnosis methods. However, the tooth profile errors caused by actual gear manufacture precision are usually neglected, which may have a direct influence on the gear vibration. In order to settle the problem of the underlying vibration mechanism with the combined effect of pitch error and spalling fault, this paper proposes a dynamic modeling method of gear pitch error coupling with spalling fault. The relationship between the gear precision grade and pitch error is investigated. The changes in both meshing stiffness phase and displacement excitation on the contact line caused by pitch error are analyzed, where the additional effect of spalling fault on stiffness excitation is also taken into consideration. Hence, the dynamic response and vibration characteristics of spur gear with coupling excitations of pitch error and spalling fault are obtained. The simulation results verified that vibration characteristics caused by the early spalling fault are easy to be affected by the pitch error, especially when the gear precision grade is low. |
