Abstract：Considering elastohydrodynamic lubrication theory and time-varying contact stiffness as the basis, a method using position function instead of time-varying stiffness coefficient is developed in this paper. A dynamics calculation model for double row tapered roller bearing with raceway surface waviness is established and effects of wave numbers and amplitude of the waviness on the vibration characteristics of bearing are analyzed. Results show that the raceway surface waviness can cause the and its multiple frequency in spectrum of vibration displacement of bearing in radial direction. The peak value appears when wave numbers of the waviness are equal or integral multiple to the number of the rollers, while the bearing is in seriously vibration. Many coupling frequencies of and rotating frequency appear in spectrum of vibration displacement of bearing in radial direction when surface waviness occurs in inner ring raceway, meanwhile there is a definite mathematical relationship between wave numbers and frequencies of peak value. Compared to inner ring, amplitude of the waviness on outer ring has great influence on vibration displacement of bearing in radial direction, moreover the peak-to-peak mean value of vibration displacement increases with the increase of the amplitude with raceway surface waviness.
Key words: spectrum of vibration; double row tapered roller bearing; surface waviness
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