Operational modal analysis applied to centrifugal compressors

Abstract

Given the predictive uncertainties associated with rotor stability, more and more end-users are requiring stability verification tests to validate the rotordynamic models to reduce the risk of rotor instability issues during operation, as well as the risk of critical speeds with low damping inside the operational speed range at full or partial load conditions. The present work examines Operational Modal Analysis methods applied to centrifugal compressors, as an alternative to the methods applied to conventional stability tests. Five OMA methods will be evaluated through its application to models of different complexity, examining the influence of sampling rate, acquisition time span, signal to noise ratio, signal processing and identification model parameters in the modal analysis.Também disponível on-line.