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一、前言 阜新市某塑料管厂位于市内居民稠密区,其SJ—65型塑料拔管机昼夜操作给附近居民造成严重的噪声危害。 治理前,在工厂马路对面距拔管机最近的民房窗前1米处进行测试,噪声级白天60分贝(A),夜间51分贝(A),倍频程频谱曲线如图1所示。 测试表明,居民(测点处)环境噪声已超过了我国城市环境噪声标准规定的“一类居民混合区”(以下简称“一类区”)的允许噪声标准(标准规定白天55分贝(A),夜间56分贝(A))。噪声频谱曲线也可看出白天和夜间测试结果分别超过了国际标准组织(ISO)噪声评价曲线N-50及N-40。
I. Introduction Fuxin City, a plastic pipe factory located in the densely populated areas of the city, its SJ-65-type plastic pipe pulling machine day and night operations to nearby residents caused serious noise damage. Before the treatment, the factory road opposite the pipe pulling machine nearest to the window at 1 meters test house, the noise level during the day and 60 decibels (A) 51 decibels at night (A), octave spectral curve shown in Figure 1. The test shows that the environmental noise of residents (measuring point) has exceeded the permissible noise standard of “a type of residential mixed area” (hereinafter referred to as “a type of area”) stipulated in China’s urban environmental noise standard (the standard stipulates daytime 55dB (A) 56 dB at night (A)). The noise spectral curve also shows that the daytime and nighttime test results exceed the ISO noise evaluation curves N-50 and N-40, respectively.