Nonlinear dynamic analysis of high speed bearings due to combined localized defects

Abstract

In this paper, the dynamic behavior of a high-speed rotating shaft under the combined localized defects on outer race, inner race and rolling element has been analyzed. An adaptive algorithm based on wavelet packet decomposition and Hilbert transform is used to extract the bearing fault characteristic component from the vibration signals. The reverse Biorthogonal wavelet 5.5 is considered as the most appropriate wavelet for decomposing the bearing vibration signal, on the basis of the maximum energy-to-Shannon entropy ratio criterion. The imperial trend suggested in diagnosing the combined localized defects of rolling bearing is based on experimental analysis at various rotor speeds. The results are presented in the form of envelope analysis, bifurcation diagrams and Poincaré maps that show the appearance nonlinearity in the dynamic response due to the rotor speed and the presence of combined localized defect. Significant peaks are reported at BPFO, BSF, FTF and modulation of BPFI with rotational frequency in envelope spectrum. Fundamental train frequency also shows noticeable excitation. A modified mathematical model shows good agreement with experimental results.

Dynamic Modeling and Vibration Response Simulation for High Speed Rolling Ball Bearings With Localized Surface Defects in Raceways

“…Patil [21] studied the effects of defect size and position on vibration amplitudes and spectral com ponents. Kankar and Pandya analyzed dynamic responses of high speed rotor-ball bearing systems due to raceway waviness [22] and combined localized defects [23], respectively. In order to investigate the interaction between bearing ring and housing, Feng [24] added another two translational DOFs to the 2-DOF model to describe the ring/housing contact.…”

“…In this model, only the two translational DOF of inner raceway in radial directions were included, and con tacts between balls and raceways were treated as nonlinear contact springs by using Hertzian theory. Many researchers investigated dynamic modeling of rolling bearings with localized defects based on the 2-DOF model [18][19][20][21][22][23][24][25][26][27]. Shao [18] investigated both the time-varying deflection excitation and the time-varying contact stiffness excitation produced by localized surface defects for cylindrical roller bearings.…”

Multi-body modelling of rolling element bearings and performance evaluation with localised damage

“…Patil et al [29] and Kulkarni and Sahasrabudhe [21] introduced defects as geometric changes in the races using circumferential half sinusoidal waves and cubic Hermite splines, respectively. Pandya et al [27] combined localised defects on the races and the REs and studied the dynamic response of a REB in those conditions.…”

Non-linear dynamic response analysis of cylindrical roller bearings due to rotational speed

“…Pandya et al. 29 used the wavelet packet decomposition and Hilbert transform to analyse the combined localized defects of a high-speed rotating shaft.…”