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一、汽车噪声特征城市交通包括各种型号,类型和大小的车辆,有电车、公共汽车、乘用车、大型载重车等等。各种车辆的相对比例,随时间,地点和道路类型的不同而不同。用定量的办法进行交通噪声评价时,比较方便可行的是,把所有车辆分为两大类;大型车辆(载重车,公共汽车等)和小型车辆(轿车,乘用车和轻型载重车等)。以这两种类型车辆噪声的特征来计算城市道路交通噪声级。 (一)大型车辆大型车辆的噪声可以认为是来自互相
First, the characteristics of car noise City traffic includes various types, types and sizes of vehicles, trams, buses, passenger cars, large trucks and so on. The relative proportions of various vehicles vary with time, location and type of road. When using quantitative methods to evaluate traffic noise, it is more convenient and feasible to divide all vehicles into two categories: large vehicles (trucks, buses, etc.) and small vehicles (cars, passenger cars and light trucks, etc.) . Calculate the urban road traffic noise level based on the characteristics of these two types of vehicle noise. (A) large vehicles Large vehicles can be considered noise from each other