论文部分内容阅读
为探明绿化带对公路交通噪声吸收消减的频谱特性,在西安市子午大道两处绿化带设置监测点,对交通噪声在不同倍频程中心频率下的衰减特征进行了测试研究。结果表明,在低频范围内,噪声能量的衰减量随倍频程中心频率增加呈逐渐上升趋势。在250 Hz中心频率处,绿化带A和B产生的A声级声衰减量可达17 dB和13.3dB。在中频段,由于植被支干的阻隔效应,交通噪声在4 kHz处出现最大衰减。在8~16 kHz的高频区域,两处绿化带所引起的噪声衰减量也均在10 dB以上,表明通过设置绿化带可有效控制公路交通噪声对两侧敏感点的影响。
In order to find out the spectral characteristics of the green belt's absorption and reduction of road traffic noise, monitoring points are set on two green belt in Xi'an meridian road, and the attenuation characteristics of traffic noise at different octave center frequencies are tested. The results show that in the low frequency range, the attenuation of noise energy increases gradually with the octave center frequency. At the 250 Hz center frequency, the A-level sound attenuation produced by the green belts A and B can reach 17 dB and 13.3 dB. In the mid-frequency band, traffic noise shows maximum attenuation at 4 kHz due to the blocking effect of vegetation. In the high frequency range of 8-16 kHz, the noise attenuation caused by two green belts is also above 10 dB, which shows that the impact of road traffic noise on the sensitive points on both sides can be effectively controlled by setting the green belt.