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DINAME2019
DINAME2019
Experimental Fault Detection in Rotating Machines Based on the Modal State Observer Approach
Submission Author:
Leandro Leão , MG
Co-Authors:
Aldemir Ap Cavalini Jr, Tobias Morais, Gilberto Pechoto de Melo, Valder Steffen Jr
Presenter: Leandro Leão
doi://10.26678/ABCM.DINAME2019.DIN2019-0197
Abstract
In this paper, a fault detection methodology based on the so-called modal state observer is applied for detecting transversal cracks in a horizontal rotating shaft. The Luenberger state observer is formulated in the modal domain to estimate the rotor vibration responses described in the modal domain. Consequently, the most affected vibration modes due to the crack existence can be determined. The kernel density estimator is applied to quantify the influence of a crack over the dynamic behavior of the rotor. The time domain vibration responses measured directly on the rotating machine are used for comparison purposes. An experimental investigation is presented by considering both breathing and open cracks. The breathing behavior of the crack is simulated according to the Mayes model. The additional flexibility introduced in the shaft by the crack is determined by using the linear fracture mechanics theory. The obtained results demonstrated that the methodology conveyed represents a good alternative technique to detect faults in rotating machines.
Keywords
rotating machinery, Fault Detection, transversal cracks, Luenberger state observer, modal state observer
