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Holistic Acoustic Absorber Design: From Modeling and Simulation to Laboratory Testing and Practical Realization

In developing a new acoustic absorber, a number of practical design challenges are experienced. Complex mathematical models for many acoustic absorbing methods have previously been developed, however there is very little accessible data describing how those models perform in a practical implementation of the design. This project describes a holistic approach to the development of a novel slotted film sound absorber and presents the results at each design iteration. Initially a number of mathematical models are considered, in order to optimize the design geometry for a maximum sound absorbing effect. Second, the modeled designs are laboratory tested with an impedance tube system. Finally, the practical acoustic absorber design, including framing and mounting methods, is finalized and tested in an ISO accredited reverberation chamber. The results of the modeling, impedance tube testing, and the room testing are all considered. It is seen that the simulation and impedance tube results match very closely, whereas the practical implementation performance is lower in terms of acoustic absorption. This research therefore presents a valuable case study for acoustic absorber designers in helping to better predict the final performance of their designs.

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Permalink: http://www.aes.org/e-lib/browse.cfm?elib=17481

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