Study on Flow-noise According to Design of Noise Mitigation Device

In modern society, we are exposed to various noise environments. To avoid noise problems, various noise mitigation devices are designed and installed on noise generating facilities. A silencer and an acoustic louver are representative noise mitigation devices for the supply/exhaustion of equipment and the splitter inside the silencer and acoustic louver is designed at various lengths and shapes for the necessary performance. A test is conducted in six steps for various designs of the silencer and acoustic louver. As a result, there is a slight difference in each design but the flow noise is similar at the same step (velocity) as 35 ㏈(A) ~ 73 ㏈(A). This means that the flow-noise is proportional to the system flow velocity. In the case of the acoustic louver, higher flow noise is generated compared to the silencer even if theflow velocity in the duct is low.