Fractal Y-shaped Diffusers on Top of Acoustic Barriers for Traffic Noise Mitigation

IF 1.7 4区 物理与天体物理
Domingo Pardo-Quiles, Ignacio Rodríguez-Rodríguez, José-Víctor Rodríguez
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引用次数: 0

Abstract

The fundamental objective of acoustic barriers is to preserve the inhabitants of nearby areas from the high noise generated by road traffic. It is possible to significantly improve the performance of conventional acoustic barriers by attaching small acoustic diffusers on their upper part (caps) that do not imply an appreciable height increase of the barrier, thereby adhering to any height regulation or restriction. This work deepens and yields findings in the study of the acoustic performance of barriers with diffusers of different shapes, number and arrangement through the calculation of their insertion losses (IL). In this research, a design of four Y-shaped diffusing elements arranged according to the well-known fractal pattern called Cantor set is presented and validated through two types of traffic noise sources (‘Car’ and ‘Ambulance’), one listener and a wide frequency band up to 10 kHz. The results demonstrate that the proposed diffuser provides a significant increase in acoustic losses compared to the results obtained in previous works without raising the height of the barrier. To the best of the authors’ knowledge, there are no diffuser structures like the one presented here that have been installed or even proposed/analysed.

Abstract Image

交通噪声消声屏障顶部的分形y形扩散器
隔音屏障的基本目的是保护附近地区的居民免受道路交通产生的高噪音。可以通过在其上部(帽)附加小的声学扩散器来显着改善常规声学屏障的性能,这些扩散器并不意味着屏障的明显高度增加,从而坚持任何高度调节或限制。本研究通过计算不同形状、数量和排列的扩散器的插入损失(IL),加深了对具有不同形状、数量和排列的扩散器的声学性能的研究,并产生了一些发现。在本研究中,提出了一种根据著名的分形模式(称为Cantor集)排列的四个y形扩散元件的设计,并通过两种类型的交通噪声源(“Car”和“Ambulance”),一个听众和高达10 kHz的宽频段进行了验证。结果表明,在不提高屏障高度的情况下,与以前的研究结果相比,所提出的扩散器显著增加了声损失。据作者所知,没有像这里展示的那样的扩散器结构已经安装或甚至建议/分析过。
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来源期刊
Acoustics Australia
Acoustics Australia ACOUSTICS-
自引率
5.90%
发文量
24
期刊介绍: Acoustics Australia, the journal of the Australian Acoustical Society, has been publishing high quality research and technical papers in all areas of acoustics since commencement in 1972. The target audience for the journal includes both researchers and practitioners. It aims to publish papers and technical notes that are relevant to current acoustics and of interest to members of the Society. These include but are not limited to: Architectural and Building Acoustics, Environmental Noise, Underwater Acoustics, Engineering Noise and Vibration Control, Occupational Noise Management, Hearing, Musical Acoustics.
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