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Abstract

As noise is highly responsible for the psychological and physiological ills to workers, the noise control for enclosed manufacturing system with sound absorber becomes obligatory; besides, considering the maintenance and operation in a room, the minimal thickness of sound absorber is certainly requested, according. To meet these issues, the compromising design target, ratio of sound absorption coefficient to thickness of acoustic panel, is thus proposed and applied as a researched objective, accordingly. In this paper, the simulated annealing (SA) is utilized in the shape optimization of the double-layer sound absorption system. The paper tackles not only the theoretical derivation in a double-layer sound absorption system, but also, the presentation of the SA searching techniques. By pre-running the optimal searches of sound absorption coefficient of a single-layer absorber at the specified frequency of 350 Hz, the reliability in SA was verified. Before optimization, the accuracy of mathematic model on a single-layer sound absorber has been confirmed to be in good agreement by the experimental data. Thereafter, the exemplified case of double-layer absorber in seeking for the optimal objective function, ratio of sound absorption coefficient to thickness of acoustic panel, at the targeted 400 Hz is thus applied in the following SA optimization. The economical and compact design of sound absorber proposed in this study surely provides a quick and optimal approach to maximize the acoustic performance at fixed total thickness and given flow resistivities of acoustic fibers by adjusting the airspace, acoustic fiber, perforated design of front plate on the perforated double-layer absorbers.

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