Study of effect of imbalance in rotor- bearing system due change in radius of gyration

Disk imbalance is a condition in which the center of mass of a rotating disk is not coincident with the center of rotation. Imbalance in a rotor system is unavoidable and it cannot be completely eliminated. Due to some reasons, such as porosity in casting, non-uniform density of material, manufacturing tolerances, and gain or loss of material during the operation, there is imbalance in rotors. In this study effect of radius of gyration of imbalanced mass on rotor-bearing vibration has been made. The imbalance increases with increase in inertia. A LabVIEW based SCXI system with accelerometer as a sensing element has been used in this study. Vibration signals collected from rotating machinery are often very complex which makes them very difficult to interpret in the time domain. Frequency spectrum analysis using Fourier transform and Continuous Wavelet transform has been made for detecting imbalance and its severity.