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Finite element modelling approach in active structural acoustic control

Universiteit Twente Uitgeverij
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  • Computer Science
  • Design
  • Musicology
  • Physics


paper_mechatronics02.dvi FINITE ELEMENT MODELLING APPROACH IN ACTIVE STRUCTURAL ACOUSTIC CONTROL Marco Oude Nijhuis† and Andre de Boer† †University of Twente, Faculty of Mechanical Engineering P.O. Box 217, 7500 AE Enschede, The Netherlands email: [email protected] 1 Introduction Over the past decades, active control methods have become valuable tools besides pas- sive methods for attenuating the sound radiation of structures. The goal of a control system is to cancel the response generated by a disturbance or primary source by in- troducing one or several secondary controlled source(s). In active noise control (ANC) the secondary sources are speakers. This approach has some successful applications but in general its effect is only local, i.e. the exists only a small ”quiet zone”. A more promising method for global control which was first introduced by Fuller (Fuller, 1990) is active structural acoustic control (ASAC). In this method actuators are directly at- tached to the structure, and a reduction of the radiated sound is achieved by changing the vibrational behaviour of the structure. Furthermore, often a control system is used with sensors that measure vibrations instead of acoustic pressure. Piezoelectric mate- rials are often used in ASAC as actuator or sensor, mainly because they can be bonded directly to the structure, not requiring a back support. Since the introduction of ASAC in the early nineties part of the research carried out worldwide has focused on modelling of structural-acoustic systems. With such models, the performance of several control algorithms can be determined already in the design process of a certain product. Furthermore, models are essential if one wants to deter- mine optimal sensor and actuator locations. A structural-acoustic model describes the interaction between the vibration of a structure and the corresponding sound field. In many cases it is allowed use uncoupled models, i.e. it is assumed that the sound field does not influence th

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