Research on noise reduction performance and optimized design of noise barriers

• Main Author: 劉延
• Other Authors: 劉霈
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/73470725517321981486

碩士 === 逢甲大學 === 運輸科技與管理學系 === 102 === The rapid development of urban transportation construction produced an increase in transport capacity, and promoted the rapid development of the regional economy, but also caused some negative effects to the surrounding environment, including particularly serious noise problem. As the noise source and the receiver point could not be changed, the transmission of noise control is particularly important. The use of noise barrier is an effective measure to reduce the disturbance by road traffic noise. The main purpose of this study is to analysis the insulation performance of noise barriers with different structural parameters and different materials. Mainly divided into two aspects: one is establishing simulation model of several commonly used noise barriers structures, and analysis the sound propagation, sound field distribution characterristcs and insertion loss properties of different noise barrier structure types; the other part discusses the noise barrier optimization design of several commonly used materials. Setting noise barriers bring a better protection for the sound shadow field. The sound waves which pass the noise barrier produce obvious insertion loss by top diffraction. With the increasing of the height, the noise reduction effect is more and more obvious. With a 0.5 meters increase after 2 meters, the measured insertion loss increases the average 5dB(A). Each 0.5 meters increase lead the insertion loss to increase 3-5db (A). Noise barriers with a top structure have obviously better IL performance than that without any top structure, which is respectively 5 - 7 dB(A) more than 2 meters vertical noise barrier. For acoustical tile and glass cotton that two materials, the sound absorption coefficient is relatively high and each frequency band sound-absorbing are more, also have about 4dB (A) averaged more insertion loss over the other three kinds of materials