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Type: Artigo de evento
Title: Active Control Of The Structural Intensity In Beams Using A Frequency Domain Adaptive Method
Author: Pereira Allan K.A.
Moreira Fernando J.O.
Arruda Jose Roberto F.
Abstract: This paper exposes an active control method consisting of minimizing the active part of the structural intensity aiming at reducing the overall vibration level in beams. The basic idea behind this strategy is that the control forces dissipate the input power due to the perturbing forces, thus preventing the structure from having to vibrate in order to dissipate the incoming energy. A frequency-domain adaptive structural intensity control method (ASIC) is used. The method is investigated using a simple example consisting of an aluminum beam which is fitted at one end with a quasi-anechoic termination (sand box) and has the other end free. Both numerically simulated and experimental results are presented. The numerical simulation uses a state-space model which was identified using experimental data. Results are compared with those obtained using the measured vibration directly and using the instantaneous wave amplitude as error signals in time-domain LMS control schemes. In the preliminary experimental results, the ASIC method and the method that controls the wave amplitudes out performed each other at different frequencies. At frequencies where the power-flow based methods performed well, their performance was equivalent to that of the direct control of vibrations. The relative advantages and disadvantages of the different control methods are discussed.
Editor: AIAA, Reston, VA, United States
Rights: fechado
Identifier DOI: 
Date Issue: 1998
Appears in Collections:Unicamp - Artigos e Outros Documentos

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