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Analysis and design of smart structures to control vibration and noise

Analyse und Konstruktion intelligenter Strukturen zur Regelung von Schwingungen und Geräuschen
 
: Gabbert, U.; Lefevre, J.; Nestorovic, T.; Ringwelski, S.

American Society of Mechanical Engineers -ASME-, Design Engineering Division; American Society of Mechanical Engineers -ASME-, Computers and Information in Engineering Division -CIE-:
Proceedings of the ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference 2007. Vol. 1: 21st Biennial Conference on Mechanical Vibration and Noise. Part A : Presented at 2007 ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, September 4 - 7, 2007, Las Vegas, Nevada, USA
New York/NY.: ASME, 2008
ISBN: 0-7918-4802-7
ISBN: 978-0-7918-4802-9
pp.49-56
American Society of Mechanical Engineers (International Design Engineering Technical Conferences) <2007, Las Vegas/Nev.>
Computers and Information in Engineering Conference (CIE) <27, 2007, Las Vegas/Nev.>
Biennial Conference on Mechanical Vibration and Noise (VIB) <21, 2007, Las Vegas/Nev.>
English
Conference Paper
Fraunhofer IFF ()
theoretische Untersuchung; Schwingungsdämpfung; Simulationsmodellbildung; Finite-Elemente-Methode (FEM); Freiheitsgrad; Eigenwertanalyse; intelligenter Werkstoff

Abstract
In this paper, the theoretical paper background of a general element simulation tool for the design of actively controlled thin lightweight structures to reduce vibration and noise radiating is presented. Besides the passive structure, the FE (finite element) model includes active piezoelectric elements, the acoustic fluid, the vibro-acoustic coupling, and the controller influence. Piezoelectric layered shell type finite elements have been extended to include the vibro-acoustic coupling with three-dimensional acoustic finite elements and infinite elements for the far field. Because of the large number of degrees of freedom of the FE model, a modal truncation technique based on a complex eigenvalue analysis is performed in the FE software COSAR and the reduced model is transformed into the state space form. Based on a data interface the state matrices are transferred to Matlab/Simulink, where an appropriate controller can be designed and tested. The developed procedure is applied to a smart plate structure and the noise reduction after switching on the controller is presented. To study the uncontrolled and controlled behaviour of piezoelectric smart vibro-acoustic systems an experimental set-up was developed. The experimental set-up includes an elastic aluminium plate attached with piezoelectric patches and a wooden box representing an acoustic cavity with different boundary conditions. The comparison of the numerical results with the measured data shows that modal truncated finite element models can be applied to analyse the uncontrolled as well as the controlled behaviour of piezoelectric smart vibro-acoustic systems. The developed approaches were also applied to industrial problems, such as a magnetic resonance tomography device and parts of a car, where further investigations are under progress.
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: http://publica.fraunhofer.de/documents/N-82808.html