Calculation Method of Radiation Noise for Deep Groove Ball Bearing with Considering 3D Waviness of Raceways

Waviness of rolling bearing has great influence on the vibration and acoustic performances of bearings. This paper takes the deep groove ball bearing as the research subject. With the autocorrelation function, 3D random surface waviness is simulated. Through mechanical analysis, the calculation method for trajectory of inner ring and the center of each ball is established. Combined with the theory of acoustics, the noise generated by bearing can be calculated quantitatively. Through a specific example, the acoustic characteristics of inner ring and balls are studied. The research shows that noise generated by bearing varies in terms of different directions. The study of sound pressure signal and frequency spectrum shows that peaks of the sound pressure spectrum close to the frequency of ball passing frequency of inner ring and outer ring. The influences of different waviness amplitude on each noise source of bearing are studied. The result shows that the peak-to-peak and RMS values of sound pressure signal increase with the waviness amplitude.