Study on the Characteristics of Sound Transmission Loss of V-type Noise Barriers for Reduction of Wind Load under Different Conditions

Abstract The characteristics of sound transmission loss of V-type noise barriers for reduction of wind load under the influence of multiple parameters is numerically investigated in this work. The results show that sound-absorbing materials and the heights of ventilation channels are the most important factors affecting sound insulation property of V-type noise barriers. The increase of the airflow resistivity of sound-absorbing materials will increase sound transmission loss in the high frequency band of noise barriers. When the airflow resistivity is increased from 1000Pa*s/m 2 to 15000 Pa*s/m 2 , weighted sound transmission loss is increased by 7dB. The weighted sound transmission loss is inversely proportional to the height of ventilation channels. The height of ventilation channels is reduced from 51mm to 6mm, and the weighted sound transmission loss is increased by 5.7dB.