Tuneable Vibration Absorber using Acceleration and Displacement Feedback

Alujević, Neven and Tomac, Ivan and Gardonio, Paolo (2012) Tuneable Vibration Absorber using Acceleration and Displacement Feedback. = Tuneable Vibration Absorber using Acceleration and Displacement Feedback. Journal of sound and vibration, 331 (12). pp. 2713-2728. ISSN 0022-460X. Vrsta rada: ["eprint_fieldopt_article_type_article" not defined]. Kvartili JCR: Q1 (2012). Točan broj autora: 3.

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Official URL: https://doi.org/10.1016/j.jsv.2012.01.012

Abstract

This study is concerned with the analysis and design of a tuneable vibration absorber, which is composed by a flexible beam with a clamping block in the middle and two masses symmetrically mounted at the two ends. The free length of the beam is used to accommodate piezoelectric strain actuators. The two masses at the ends are equipped with inertial accelerometers. This arrangement is used to generate two independent acceleration feedback control loops that produce virtual mass effects, which shift the absorbing frequency of the device. Another arrangement is also studied where the two accelerometer outputs are time-integrated twice in order to implement displacement feedback loops that change the beam stiffness to shift the characteristic frequency of the device. The two feedback approaches are first analysed theoretically, using a mobility-impedance model, and then experimentally on a prototype absorber unit. The stability of the feedback loops is studied using the Nyquist criterion in order to estimate the limits on the tuneable range of frequencies which are set by the maximum stable feedback gains. The study indicates that the stability margins for the acceleration feedback loops substantially depend on the application of an appropriate low-pass filter. In contrast the implementation of displacement feedback gives better stability margins.

Item Type: Article (["eprint_fieldopt_article_type_article" not defined])
Keywords (Croatian): active vibration control; tuneable vibration absorber; acceleration feedback; displacement feedback
Subjects: TECHNICAL SCIENCE > Electrical Engineering
TECHNICAL SCIENCE > Mechanical Engineering
TECHNICAL SCIENCE > Aviation, rocket and space technology
Divisions: 600 Department of Naval Engineering and Marine Technology > 620 Chair of Marine Structures Design
Indexed in Web of Science: Yes
Indexed in Current Contents: Yes
Quartiles: Q1 (2012)
Date Deposited: 20 Mar 2017 12:46
Last Modified: 15 Dec 2017 12:48
URI: http://repozitorij.fsb.hr/id/eprint/7588

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