This paper focuses on the distribution characteristics of the radiation noise for a full-ceramic angular contact ball bearing (FCACBB). A model for calculating the radiation noise of a FCACBB was established based on the bearing dynamic characteristics and sound radiation theory, and the effectiveness and accuracy of the method were verified by corresponding experiments. The variation of the radiation noise for a FCACBB with the rotational speed was analyzed. The directivity of the sound field in the circumferential direction was found. The variation trends of the radiation noise in the friction load zone and the impact load zone were discussed. The attenuation of the radiation noise in the radial direction and in the axial direction was investigated. The directivity angle and the degree of directivity of the sound field were explored at different radial and axial distances. The results show that the inhomogeneous contacts between the bearing components in the circumferential direction result in different degrees of friction and impact vibration at different locations, which makes the radiation noise of the FCACBB have a larger component in the radial direction than in the axial direction. The conclusions can provide a reference for predicting the radiation noise of FCACBBs and further optimizing the sound field.

本文着重于全陶瓷角接触球轴承（FCACBB）的辐射噪声分布特征。基于轴承动态特性和声辐射理论，建立了FCACBB辐射噪声的计算模型，并通过相应的实验验证了该方法的有效性和准确性。分析了FCACBB辐射噪声随转速的变化。发现了声场在圆周方向上的指向性。讨论了摩擦载荷区和冲击载荷区辐射噪声的变化趋势。研究了辐射噪声在径向和轴向上的衰减。研究了在不同径向和轴向距离下声场的指向角和指向性程度。结果表明，轴承组件之间在圆周方向上的不均匀接触导致在不同位置产生不同程度的摩擦和冲击振动，这使得FCACBB的辐射噪声在径向方向上具有比轴向方向更大的分量。结论可为预测FCACBBs的辐射噪声和进一步优化声场提供参考。这使得FCACBB的辐射噪声在径向方向上的分量大于在轴向方向上的分量。结论可为预测FCACBBs的辐射噪声和进一步优化声场提供参考。这使得FCACBB的辐射噪声在径向方向上的分量大于在轴向方向上的分量。结论可为预测FCACBBs的辐射噪声和进一步优化声场提供参考。