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Inverse estimation of the non-acoustical parameters of loose granular absorbers by Simulated Annealing

机译：模拟退火法反演松散颗粒状吸收体的非声学参数

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Absorbing materials are fundamental for the acoustic design of buildings. They are used for increasing the insulation from either outdoor or neighbour noise and for raising the acoustic comfort of dwellings. If environmental and health issues are not of concern, conventional sound absorbers, namely synthetic foams and fibrous materials, offer an excellent acoustical performance at a moderate cost. However, the current trend towards eco-efficient products encourages the enhanced use of natural fibre and loose granular recycled materials. Whatever the material type, a model is required to reliably predict its acoustical performance. The microstructural Champoux-Stinson model has demonstrated to provide consistent acoustical predictions once five non-acoustical parameters are given. Instead of measuring these non-acoustical parameters, which is a rather sophisticated and time consuming procedure, an inverse method, based on Simulated Annealing, is proposed in this paper to estimate them from a single and simple measurement of the absorption coefficient. Experimental results on two samples of loose aquarium gravel validate the proposed inverse method. (C) 2015 Elsevier Ltd. All rights reserved.
机译：吸收材料是建筑物声学设计的基础。它们用于增加与室外或邻居的噪音之间的隔离度，并提高住宅的声音舒适度。如果不考虑环境和健康问题，则传统的吸声器，即合成泡沫和纤维材料，将以适中的成本提供出色的声学性能。但是，当前趋向于生态高效产品的趋势鼓励更多地使用天然纤维和疏松的颗粒状再生材料。无论哪种材料类型，都需要一个模型来可靠地预测其声学性能。一旦给出了五个非声学参数，微结构的Champoux-Stinson模型已证明可以提供一致的声学预测。代替测量这些非声学参数（这是一个相当复杂且耗时的过程），本文提出了一种基于模拟退火的逆方法，以通过对吸收系数的一次简单测量来估算它们。在两个松散的水族馆砾石样品上的实验结果验证了所提出的反演方法。 （C）2015 Elsevier Ltd.保留所有权利。

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