Monitoring the Dynamic Behavior in Polar Domain for an Easier Diagnostic of Rotating Machinery

The observation of the measurements in the polar domain can lead to an easier interpretation of the dynamic behavior, where the steady state and the transient behaviors could be directly distinguished. This transformation is simple and widely used in robotic. Numerical and experimental investigations are performed and presented in this paper. Experiments were performed on a test bench dedicated to the assessment of the aerodynamic behavior of a compressor impeller. The impeller is mounted at the free end of a rotor supported by two tilting pad bearings. Besides the unbalance excitations, the impeller is subject to low frequency aerodynamic perturbations. The results obtained show the effectiveness of this methodology for an easier monitoring and for the control of rotating machinery.