Noise Effect Analysis Between Inverted L-shaped And Drum-type Sound Barrier

With the rapid development of the national economy,the manufacturing industry of China, especially the automotive industry, has made great progress. To the end of last year, car ownership in China has reached 137 million, the country has a number of cars in 31 cities over one million, including Beijing, Tianjin, Chengdu, Shenzhen, Shanghai, Guangzhou, Suzhou, Hangzhou and other eight cities the number of cars more than 2 million, more than 5 million cars in Beijing. Traffic noise, industrial noise, urban construction noise and noise pollution issues become commercial activity factors seriously affect the quality of life of residents.This paper described the current situation and the hazards of noise pollution problem, and then discusses the evaluation and control methods by noise, traffic noise barrier is an effective way to control noise pollution. Following the presentation of the application and development of domestic and international road sound barrier.This paper discussed the theoretical basis of acoustic noise barrier, sound barrier made mainly blocking direct sound transmission of noise, reducing sound transmission and allow diffraction sound enough to weaken the sound attenuation three aspects of energy spread. While the acoustic barrier structure type and use the material to make a brief introduction.Then this paper scale model and a detailed description on similar principles, tell a similar theorem three theorems, noting a large scale model tests used in the production of life, pure research and traditional research plays an irreplaceable role. Lay the theoretical foundation for this paper tests.Finally, in a semi-anechoic chamber on an inverted L-and drum-type sound barrier for noise testing, analysis, spectral characteristics of the sound barrier insertion loss. By comparing different distances, high insertion loss measurement points in the inverted L-shaped and drum-type sound barrier curve to analyze the effect of different types of noise sound barrier.The tests use sound barrier scale model, in a semi-anechoic chamber experiment on the sound barrier, the external factors to a minimum. Test to ensure maximum reliability and authenticity of data. Sound barrier for the future conduct structural design and application reference.