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《Study on Influence of Sound Barrier Structure on Its Noise Reduction Performance with Numerical Simulation》
CHEN Ji-hao;JI Zhi-jiang;ZHANG Zhong-lun;WANG Jing;SUI Tong-bo
2010, 30 (1):
63-66.
DOI: 10.3969/j.issn.1006-1355.2010.01.063
The acoustic performances of Yshaped, multiwedgeshaped, and Tshaped structures of noise barrier are simulated by using acoustic softwareRAYNOISE. In the region of 30m height and 50m width behind the sound barrier, the simulation result of noise reduction effect is obtained. The result indicates that the multiwedgeshaped structure is the best for noise reduction. Its insertion loss can reach 14.5dB in the region of 2m height and 50m width behind the noise barrier. The noise barrier of the Tshaped structure has good acoustic performance in the region of lower height behind the noise barrier. The insertion loss of the Yshaped structure decreases slightly when the height of the measurement point increases. The influence of sound absorption material on noise reduction is studied. The result indicates that the distribution of sound absorptionmaterial has no influence on the noise reduction effect in the region just behind the barrier. The possible reason is that the reflection between the barrier and the vehicle is not considered in the simulation.
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