With the background of research on calculation of vibration and noise of gearbox by using statistical energy method
the application frequency threshold of statistical energy analysis is studied and a criterion of application frequency threshold of thick-walled structure category for gearbox is proposed.On the basis of research above
a method of defining application frequency threshold of statistical energy analysis for different complex structures and some suggestions of dividing subsystem for gearbox are proposed
a certain basis for using statistical energy analysis to calculate vibration and noise of gearbox accurately is provided.