A study on the difference in noise reduction between rear and side microphone on CPX measurement method through sound absorption frequency analysis

• DOI: 10.3397/in_2024_3419
• Publication Date: 2024-10-15T04:38:32Z
• Authors: Hyunjin KIM; Byungchae KIM; Seunghan RYU; Suwhan SUNG
• Keywords: Noise-canceling microphone

The road noise evaluation method in Korea is based on the 'noise vibration process test standard' by Ministry of Environment. In this method, felt at sound-receiving point measured as LAeq. Recently, order to clarify measurement standards for low-noise pavements, an international standard (ISO11819-2, CPX method) was first introduced Porous Pavement Guidelines Land, Infrastructure and Transport. According ISO, adopts side microphones mandatory, rear microphone optional. Due difference location level different, causing confusion method. Researchers have published several studies past that highly correlated with equivalent Korean standard. As a follow-up study above results, examines characteristics causes frequency spectrum case dense asphalt pavement porous derives results through analysis sound absorption coefficient determine contribute improving reliability institutional rationalization