WWT Division, CSIR-National Environmental Engineering Research Institute, Nehru Marg, Nagpur, 440020, Maharashtra, India.
Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India.
Environ Sci Pollut Res Int. 2022 Jan;29(2):1729-1745. doi: 10.1007/s11356-021-16944-2. Epub 2021 Oct 27.
The acoustical properties of a barrier are highly dependent on the physical properties of the material and the internal structure of the material. The acoustical material can curtail the quality of sound or enhance the dispersion, depending on the application being considered. The efficient acoustic performance of noise barriers possessing different shapes and materials including waste materials is reviewed for field implementation to achieve the low-cost sustainable noise barrier application in the Indian context. The review analysis of research papers demonstrates that the acoustic performance of barriers is dependent on different shapes, materials, and textures as well as onsite geometry. Based on the review study, T-shaped barriers with a soft top surface are found to be efficient at noise attenuation. For transparent barriers, perceived loudness and noise annoyance are assessed lower than that for opaque barriers and utilization of waste materials viz. plastic, rubber, bottom coal ash, etc. gives high noise attenuation along with low-cost efficiency. Noise pollution levels are high from prescribed noise limits in most of the Indian metropolitan cities. The Indian government is working on mitigation strategies of noise pollution as well as abiding laws regarding noise standards for the zone (residential, industrial, commercial, and silences) wise. In contrast, some communities which are adjacent to roads are suffering from high noise levels in the ambience. Therefore, it requires a coherent strategy for long-term measures intended at minimizing exposure of noise hence providing much more comfort to live, work, and shop near high-traffic roads. Noise barriers are highly beneficial in mitigating the emitted noise from the traffic.
屏障的声学特性高度依赖于材料的物理特性和材料的内部结构。声学材料可以根据所考虑的应用来控制声音的质量或增强分散性。本文综述了不同形状和材料（包括废料）的噪声屏障的高效声学性能，以实现低成本可持续的噪声屏障在印度环境中的现场应用。对研究论文的回顾分析表明，屏障的声学性能取决于不同的形状、材料和质地以及现场几何形状。基于综述研究，发现具有柔软顶表面的 T 形屏障在衰减噪声方面非常有效。对于透明屏障，感知到的响度和噪声烦恼被评估为低于不透明屏障，并且利用废料（如塑料、橡胶、底煤灰等）可实现高噪声衰减和低成本效率。在大多数印度大都市城市，规定的噪声限值都存在较高的噪声污染水平。印度政府正在制定噪声污染缓解策略以及遵守有关区域（住宅、工业、商业和安静区）噪声标准的法律。相比之下，一些毗邻道路的社区在环境中遭受着较高的噪声水平。因此，需要制定一项长期措施的协调战略，旨在最大限度地减少噪音暴露，从而为在交通繁忙的道路附近生活、工作和购物提供更大的舒适度。噪声屏障在减轻交通发出的噪声方面非常有益。
