Polar and Orbit Plot Analysis for Unbalance Identification in A Rotating System

Abstract

This paper presents a detailed analysis of polar and orbit plots considering a non-faulty shaft and one with an unbalanced mass attached to it. Polar Plot analysis was done in order to determine the amplitude of vibration and the phase difference between faulty and non-faulty case. Also the orbit plot analysis provides a clear image of the two different cases, in which the area under the ellipse can be considered as the measure of the unbalance.