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利用随车声强法对5条不同水泥混凝土路面噪声特征进行了测试,分析了露石水泥混凝土与刻槽水泥混凝土路面噪声水平的差异,得到了车辆以60km/h速度下测试路段的1/3倍频程频谱分布特征。结果表明:露石水泥混凝土路面比刻槽水泥混凝土路面噪声水平低4.1~8.2dB;而横向等间距刻槽水泥混凝土路面噪声要比纵向刻槽水泥混凝土路面高出0.8~4dB;随着槽间距的增大,横向刻槽水泥混凝土路面噪声逐渐增大,且呈线性增长;水泥混凝土路面/轮胎相互作用噪声频谱主要分布在200~3 150 Hz之间;随着1/3倍频程频率的增加,声压级会逐渐增大,增大到一定值时就会逐渐减小,最大声压级对应的频率一般在800~2 000 Hz之间;露石路面和纵向刻槽的频谱曲线没有出现噪声尖峰,而横向刻槽水泥混凝土路面存在明显的噪声尖峰。
The noise characteristics of five different cement concrete pavements were tested by using the car sound intensity method. The differences of the noise level between the cement concrete and the grooved cement concrete pavement were analyzed. The test results showed that when the vehicle was traveling at a speed of 60km / h, Spectral distribution of 3 octave band. The results show that the noise level of cement concrete pavement is 4.1 ~ 8.2dB lower than that of carved concrete pavement, while the noise of transversely-spaced groove cement concrete pavement is 0.8 ~ 4dB higher than that of vertical caulking concrete pavement. The noise of cement concrete pavement / tire interaction is mainly distributed in the range of 200-3 150 Hz. With the frequency of 1/3 octave band Increases, the sound pressure level will gradually increase, increases to a certain value will gradually reduce the maximum sound pressure level corresponding to the frequency is generally between 800 ~ 2 000 Hz; exposed surface of the stone and vertical groove spectrum curve Noise spikes appear, whereas horizontal notch concrete pavements have significant noise spikes.