Abstract
This paper describes research utilizing structural acoustics in novel ways to cancel the transmission of sound and vibration through multielement flexible barriers. Configurations analyzed include panels with different thickness and elastic modulus in different regions and layered structures connected by an elastic suspension. The purpose of the research is to demonstrate that flexibility and controlled resonant behavior can be used to block sound transmission even when structural damping is very low. Strategies are considered to alter vibrating surface wavenumber spectra to reduce coupling between the structure and the acoustic field. Another approach that can be employed is the utilization of structural wave cutoff with multielement multipath (MEMP) structures. Finally, multiple differentially tuned subsidiary elements acting as resonators can be used to greatly reduce the structural response. Examples of acoustic transmission loss through panel barriers using different strategies are presented, and the potential advantages and possible shortcomings of various approaches are evaluated. Possible configurations for layered sound reduction materials are proposed. The work has particular application to the reduction of vehicle interior noise and addresses the need for good acoustic performance of the lighter weight flexible structures that will be used in the future.
Published Version
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