论文部分内容阅读
由于铁路环境噪声是非正态分布特性,在对其等效声级测量时,除了使用积分声级计测量所得Leq结果可靠外,应用本文所介绍的计算法来测量铁路环境噪声的等效声级也是较精确的,而使用城市通用的环境噪声等效声级测量法—读数法来测量铁路环境噪声时除非选择测量时间具有代表性,否则所测结果误差较大,故用读数法要慎重。火车同城区汽车所产生的噪声有很大差异,汽车噪声发生的频度比火车要高得多,而一次火车通过的噪声比汽车的声级高,持续时间长。鉴于铁路噪声与交通噪声有这些差别,因此,我们认为用城市环境噪声测量方法。来测量火车环境噪声。是否合适是个值得探讨的问题。为了找出适合评价铁路噪声较好的等效声级(Leq)测量方法,除了用等效声级计测量外,我们将目前常用的声级计测量A声级后再求等效A声级的两种方法同时在铁路环境噪声评价中进行了比较。
Due to the non-normal distribution of railway environmental noise, the equivalent sound level of railway environment noise is measured by using the calculation method introduced in this paper except for the reliable Leq result measured by the integrated sound level meter when measuring its equivalent sound level. But also more accurate, and the use of the city’s common environmental noise equivalent sound level measurement method - reading method to measure the railway environment noise, unless the choice of measurement time representative, otherwise the measured results greater error, so the reading method should be cautious. There is a big difference between the noise generated by trains and cars in the same city. The frequency of car noise is much higher than that of trains. However, the noise passed by a train is higher than the car’s sound level for a long time. In view of these differences between railway noise and traffic noise, we consider urban noise measurement method. To measure the train environment noise. The suitability is a question worth exploring. In order to find out the equivalent sound level (Leq) measurement method which is suitable for evaluating the railway noise, besides measuring with the equivalent sound level meter, we measure the A sound level of the commonly used sound level meter and then obtain the equivalent A sound level The two methods are compared in the evaluation of railway environmental noise at the same time.