一种交通噪声预测的新方法

介绍了一种交通噪声预测的新方法.该方法将车、受声点看成一线性系统,先求得单位声功率车辆在受声点处随时间变化的声压级平方,将其作为该系统的脉冲响应,然后将一定车流量的交通道路车流作为输入信号,卷积输入信号与脉冲响应,得到交通道路车流在受声点处一定时间段的声压级平方,从而得到该点的等效声压级等各个噪声参数.考虑了车辆类型和车道的影响,利用一交通道路的实测结果,与使用MATLAB软件得到的模拟结果比较表明:该方法预测的等效声级与实际测量结果相差在1 dB以内,且能预测累计分布声级等噪声评价参数.

New Concept for Traffic Noise Prediction

A new concept for traffic noise prediction is introduced. This concept considers vehicles and receiver as a linear time invariant. If the input signal is a car with unit sound power, the impulse response of this system are the receiver sound pressure squre of time. Convolution IR with a series of cars, the sound pressure of this road are achieved. Considering the ve- hicle types and road lane, the traffic noise is predicted by this concept with MATLAB. Comparing the simulation result with measuring data, this method can predict the equivalent continuous sound pressure level with error of less than 1 dBA, and this method can also predict the cumulative distribution of sound level.