论文部分内容阅读
目的在职业病危害预评价中,更准确地预测噪声强度。方法以某发动机扩建工程噪声预测为例,介绍噪声计算在职业病危害预评价中的应用。结果噪声叠加计算公式为LP=10 lg[10Lp1/10+10Lp2/10],当作用于某一点的2个声源声压级相等,其合成的总声压级比1个声源的声压级增加3 dB。点声源衰减计算公式为ΔL=10 log(1/4πr2),不同距离衰减量可根据文中点声源随距离的声衰减曲线查找。结论原有厂房内添加噪声源后的噪声强度可以通过噪声叠加计算公式预测,离噪声源有一定距离的噪声强度可以通过噪声衰减计算公式预测。噪声计算方法简便,结果可靠。
Objective To estimate the noise intensity more accurately in pre-evaluation of occupational hazards. Taking the prediction of engine expansion as an example, this paper introduces the application of noise calculation in pre-evaluation of occupational hazards. As a result, the noise superposition is calculated as LP = 10 lg [10Lp1 / 10 + 10Lp2 / 10]. When the sound pressure levels of the two sound sources acting on a certain point are equal, the total sound pressure level of the synthesized sound pressure is greater than the sound pressure of one sound source Increase by 3 dB. The point source attenuation calculation formula is ΔL = 10 log (1 / 4πr2). The attenuation of different distances can be found according to the acoustic attenuation curve of the distance from the mid-point sound source. Conclusion The noise intensity of original plant after adding noise source can be predicted by noise superposition formula. The noise intensity at a certain distance from noise source can be predicted by noise attenuation formula. The noise calculation method is simple and the result is reliable.