On the parametric excitation of rotors with rolling element bearings

Simulation of Rolling Element Bearings

Rolling bearings are high precision, low cost machine elements, used in all kinds of rotating machinery. Simulations of rolling bearings bring increased understanding of their dynamic behaviour, and shortens product development time. A rolling bearing simulation model called BEAST (BEAring Simulation Tool), has been developed by SKF. Due to the high demands on contact geometry description and c...

Electrostatic wear monitoring of rolling element bearings

Research and development work at the University of Southampton using an electrostatic condition monitoring system developed by Smiths Aerospace Information Systems has shown that electrostatic charge signals can be used to detect the onset of wear in lubricated tribo-contacts. Preliminary investigations have already demonstrated the viability of this system when tested on a laboratory-based pin...

Parametrically Excited Vibration in Rolling Element Bearings

A defect-free rolling element bearing has a varying stiffness. The variation of stiffness depends on number of rolling elements, their configuration and cage frequency. The time-varying characteristics of the stiffness results in a parametric excitation. This may lead to instability which is manifested as high vibration levels. An FEM simulation is performed to evaluate stiffness in each config...

Rotordynamic Stabilization of Rotors on Electrodynamic Bearings

Application Of Wavelet Transform For Fault Diagnosisof Rolling Element Bearings

The rolling element bearingsare most critical components in a machine. Condition monitoring and fault diagnostics of these bearings are of great concern in industries as most rotating machine failures are often linked to bearing failures. This paper presents a methodology for fault diagnosis of rolling element bearings based on discrete wavelet transform (DWT) and wavelet packet transform (WPT)...