Investigation of Vibration Characteristics of Ball Bearing Defects Using Dimensional Analysis

摘要

A systematic approach is proposed to investigate dynamic characteristics of a rotor-bearing system subjected to bearing looseness. The vibrations in rotating machines due to the unbalance in the rotating parts are studied. In this context, the mathematical model of rotor-bearing system for unbalance condition is developed using dimensional analysis. In order to diagnose the vibration characteristics of unbalanced rotor-bearing system, the experimental setup is designed and developed which is used to simulate the combined mechanical faults for different working conditions. The vibrations in rotating machines due to unbalance and clearance/looseness in the bearings for different loads and speeds are studied. The good correlation between the mathematical model and experimental results are presented. The results from the mathematical model can be effectively used to determine the influence of unbalance and clearance/looseness in the rotor-bearing system.