Modal analysis of a piezo based axisymmetric rotational vibration absorber

Zhao, Guoying and Jacobs, William and Depraetere, Bruno and Alujević, Neven and Pinte, Gregory and Sas, Paul (2013) Modal analysis of a piezo based axisymmetric rotational vibration absorber. = Modal analysis of a piezo based axisymmetric rotational vibration absorber. In: 5th International Operational Modal Analysis Conference, IOMAC 2013, 13.-15. 05. 2013., Guimaraes, Portugal.

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Abstract

To control shaft vibrations on rotating machinery, an axisymmetric rotational piezo based inertia shaker has been developed. The advantage of this device is that it can be installed directly on the shaft as an add-on device in parallel to the functional bearings. By connecting a shunt circuit with variable inductance to the piezo-actuator, it is possible to modify its effective elastic stiffness induced by the piezoelectric effect. As a consequence, the resonance frequencies of the inertia shaker can be adjusted to track frequency changes of the disturbance. To verify this theoretical prediction, a Finite element (FE) model of the inertia shaker is developed, in which the effect of the shunt circuit is simulated by varying the value of the Young’s modulus of the piezo element. This axisymmetric inertia shaker has been tested on an experimental test bed consisting of a rotating shaft and a supporting frame, where an electrodynamic shaker is used to apply the disturbance force. The experimental validation has been carried out by means of a classical modal analysis. In a first set of experiments, an extensive measurement of the whole test bed is performed, from which the most important modes of the whole test bed have been identified. As a result, the control efficiency of the inertia shaker is better understood. In a second set of experiments the working principle of the inertia shaker with a shunt circuit is then verified, experimentally confirming that the inertia shaker behaves as a lightly damped tunable vibration absorber.

Item Type: Conference or Workshop Item (Lecture)
Keywords (Croatian): Modal Analysis; Vibration Absorbers; Piezoelectric actuators; Rotation Machinery; Vibration Control
Subjects: TECHNICAL SCIENCE > Shipbuilding
TECHNICAL SCIENCE > Electrical Engineering
TECHNICAL SCIENCE > Mechanical Engineering
Divisions: 600 Department of Naval Engineering and Marine Technology > 620 Chair of Marine Structures Design
Indexed in Web of Science: No
Indexed in Current Contents: No
Citations SCOPUS: 2 (15.12.2017.)
Date Deposited: 21 Mar 2017 13:49
Last Modified: 15 Dec 2017 13:11
URI: http://repozitorij.fsb.hr/id/eprint/7605

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