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Accession Number:
ADP011130
Title:
Active Structural Acoustic Control as an Approach to Acoustic Optimization of Lightweight Structures
Descriptive Note:
Corporate Author:
OTTO VON GUERICKE UNIV MAGDEBURG (GERMANY) DEPT OF ADAPTRONICS
Report Date:
2001-06-01
Pagination or Media Count:
8.0
Abstract:
Conventional approaches to optimizing the acoustic behavior of lightweight structures have mainly been restricted to the concept of Active Noise ControlANC. This concept is aimed to attenuating primary noise sources with secondary controlled noise sources by taking advantage of destructive interference. However it is also possible to actively control the vibrating structure using piezoceramic actuators to alter very intensively sound-radiating operating deflection shapes. This approach is referred to as Active Structural Acoustic Control ASAC. The applicability of this concept to real systems is demonstrated by means of a simple model with experimental measurement systems employed in the lower frequency range. This study focuses on the utilization of a modern measurement technology i.e. the Spatial Transformation of Sound FieldsSTSF which facilitates the determination of important parameters of the vibro-acoustic system at a time. The radiation efficiency is of major importance to the evaluation of the acoustic system behavior. As the lower frequency range is considered the dynamic system behavior is determined by means of the Experimental Modal Analysis EMA. The results of this study show the radiation efficiency of the unregulated and of the actively controlled system.
Distribution Statement:
APPROVED FOR PUBLIC RELEASE
