The application discloses a
rail transit wall-attached sound-absorbing layer structure and a design method thereof. The sound-absorbing layer structure is composed of three
layers of curlable sound-absorbing materials, and is respectively a
noise capturing layer, an acoustic corridor layer and a low-frequency suppression layer along the radial direction of a tunnel. A plurality of regular hexagonal micro-
porous channel units are arranged in an array on the
noise capturing layer. The acoustic corridor layer is provided with staggered cavity corridor structures in an array, so that sound
waves are reflected multiple times to convert
sound energy into
internal energy. The low-frequency suppression layer is provided with arrayed
mass concentration units. Due to the difference in density between the arrayed
mass concentration units and the film, the vibration of the
system composed of the arrayed
mass concentration units and the film is opposite, so that the sound-absorbing performance of the whole material is improved. According to the psychoacoustic annoyance degree, the sound-absorbing layer structure can be optimized, so that the design of the sound-absorbing layer structure meets the comfort of drivers and passengers during
train driving, prevents work errors of
train staff due to hearing insensitivity, and guarantees
safe operation of the
train.