The 48 sections of sound barriers that have been built on expressways in Jiangsu Province are selected as the objects.Through the detection of insertion loss value of sound barriers and field investigation,the impact of sound barrier materials and damage degree on their noise reduction effect is studied,and suggestions on sound absorption and insulation materials for sound barriers in Jiangsu Province are put forward.The conclusions are as follows:the noise reduction effect of sound absorption materials can increase by about 2 dB on average,and the durability of noise reduction effect of non-metallic fillers in the sound absorption screen is not as good as that of metal fillers;The difference in sound insulation screens has a relatively small impact on the noise reduction effect of the sound barrier;The damage of the sound barrier has a significant impact on noise reduction,with the bursting of laminated safety glass causing a loss of approximately 1.2 dB in the noise reduction effect of the sound barrier.Looseness of the screen body can reduce the noise reduction effect of the sound barrier by more than 5 dB;Considering the overall cost and maintenance difficulty,it is recommended to use acrylic panels for the sound barrier insulation screen,and aluminum alloy panels for the sound absorption screen.
sound barriernoise reduction effectsound absorbing materialssound insulation screenJiangsu Province
万方数据
维普
