Acoustic model of ceramic angular contact ball bearing based on multi-sound source method

This study focuses on the radiation noise of ceramic angular contact ball bearings for motorised spindles. The differential equations of the vibrations for each bearing component are established, and the characteristics of various sound sources are analysed. Then, a multi-sound source method for calculating the radiation noise of a ceramic angular contact ball bearing is developed. The accuracy and validity of the proposed method are verified through numerical calculations and a corresponding experiment. Subsequently, the frequency spectrum characteristics of the radiation noise of the bearing components are discussed in detail according to the multi-sound source method. The radiation noise of each bearing component varies nonlinearly with the rotation speed, and the variation is consistent with the total radiation noise of the bearing. The eigenfrequency noise of each component appears clearly in the noise frequency spectrum. The results show that the proposed method can well predict the radiation noise of a ceramic angular contact ball bearing and provide a theoretical reference for the study of silent ceramic angular contact ball bearings for motorised spindles.