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Absorptive Material Arrangement Method for Global Interior Noise Control in Wide Frequency Range

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A simple method is proposed to arrange absorptive material for global interior noise reduction in wide frequency range. When an enclosure’s typical dimensions are of the order of several wavelengths or less, and sources and enclosure are geometrically complex, it is not easy to select the means that guide us to effectively control its noise by attaching absorptive materials on its walls. The proposed method, however, will lead the designer to better understand which treatments are most effective and how a better design can be achieved. The beauty of proposed method is that one can easily find absorptive material arrangement for global noise reduction needless to calculate sound field by using perturbation method or boundary element method. This means that one can effectively find the absorbent’s arrangement because this method needs only eigenstructures (eigenvalue and eigenfunction) of an enclosure.

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