Alves Juliana A, Silva Ligia T, Remoaldo Paula C
Lab2PT - Landscape, Heritage and Territory Laboratory. CTAC - Centre for Territory, Environment and Construction, Portugal.
CTAC - Centre for Territory, Environment and Construction, Portugal.
Noise Health. 2018 Jul-Aug;20(95):131-145. doi: 10.4103/nah.NAH_64_17.
The aim of this article is to assess the impacts of low frequency noise, emitted by high-voltage lines and power poles, on the perception of discomfort, comparing two different groups of inhabitants (exposed and unexposed groups) in two areas in the Northwest of Portugal. It proposes a new oriented methodology to assess discomfort due to the low frequency noise.
Two predominantly urban areas were used to test the methodology: an "exposed" area with a high presence of the source under study and an "unexposed" area without records of power transmission lines. The research developed included measuring sound levels (in frequency bands from 10 to 160 Hz) with the help of a sound level meter in the two selected urban areas.
The real sound coming from the source was recorded and reproduced in an audiometric testing booth to determine the hearing threshold and discomfort of the volunteers. Using the criteria curve developed by DEFRA (Department for Environment, Food & Rural Affairs/University of Salford) in 2011, the results reveal that the sound levels recorded for the "exposed" group were higher than that for the "unexposed" group. The first recording showed an average of 68.9 dB and the second 64.6 dB, resulting in a significant difference of 4.3 dB between the two groups. After an attempt to isolate the source, the difference was 5.6 dB. Regarding the adapted audiometric tests, the real sound was used, which was collected 5 m between the receiver and the source.
These results provide support that at this distance the noise was considered annoying.
本文旨在评估高压线路和电线杆发出的低频噪声对不适感的影响，比较葡萄牙西北部两个地区的两组不同居民（暴露组和未暴露组）。本文提出了一种新的定向方法来评估低频噪声引起的不适感。
使用两个主要为城市的区域来测试该方法：一个是“暴露”区域，有大量研究中的噪声源；另一个是“未暴露”区域，没有输电线路记录。所开展的研究包括在两个选定的城市区域借助声级计测量声级（在10至160赫兹频段）。
在听力测试 booth 中记录并重现了来自噪声源的真实声音，以确定志愿者的听力阈值和不适感。使用英国环境、食品和农村事务部/索尔福德大学（DEFRA）在2011年制定的标准曲线，结果显示“暴露”组记录的声级高于“未暴露”组。第一次记录的平均值为68.9分贝，第二次为64.6分贝，两组之间存在4.3分贝的显著差异。在尝试隔离噪声源后，差异为5.6分贝。关于适应性听力测试，使用的是在接收器和噪声源之间5米处收集的真实声音。
这些结果支持在这个距离噪声被认为是烦人的。
