Naslov
Modal analysis of a piezo based axisymmetric rotational vibration absorber

Autori
Zhao, Guoying ; Jacobs, William ; Depraetere, Bruno ; Alujević, Neven ; Pinte, Gregory ; Sas, Paul

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of 5th IOMAC International operational modal analysis conference. / - , 2013, 120-129

Skup
5th International Operational Modal Analysis Conference, IOMAC 2013

Mjesto i datum
Guimarães, Portugal, 13.05.2013. - 15.05.2013

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Modal Analysis; Vibration Absorbers; Piezoelectric actuators; Rotation Machinery; Vibration Control

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Brodogradnja, Elektrotehnika, Strojarstvo

Napomena
Paper No.229

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