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二、以车间建筑作为声源的 声级求取 工厂的机械加工、冷作、锻压车间或动力站房等常配备有较强噪声的机器设备,这些强噪声透过厂房的外墙向外辐射,在噪声预评价工作中,往往也把这厂房建筑当作一个声源来对待,求取方法是先求得车间内的机器声级传播到车间内距离为r的某定点的声级,然后计算通过外墙的透射损失而得到厂房墙外的声级,再按声传播的原理,求取车间外距离为l的某受声点的声级,再分别求取各声源辐射到同一受声点的声级,将声级叠加即求得该受声点的综合声级。厂房内噪声的传播状况如图2.2所示。
Second, the sound level of the workshop building as the sound source to get the factory mechanical processing, cold work, forging shop or power station and other equipment often equipped with strong noise, the strong noise through the plant’s external wall radiation In the work of pre-assessment of noise, this plant building is often treated as a sound source. The method is to find the sound level at a certain point at a distance r in the workshop and then Calculate the sound transmission through the wall and get the sound level outside the plant wall, and then the principle of sound propagation, and get the sound level of a sound point by the distance l outside the workshop, and then separately for each sound source radiation to the same The sound level of the sound point, the sound level will be superimposed to obtain the sound level of the integrated sound level. The propagation of noise in the factory is shown in Figure 2.2.