Study On The Effect Of Building Flanking Sound Transmission For Room Sound Insulation

The sound insulation performance of buildings is an important index of urban residence acoustic environment,it directly decides the residential sound environment quality. With the development of rapid urbanization in China, the acoustical environment of architecture is confronted with huge challenges, such as the rapid advance of urban traffic, traffic noise has become an important noise pollution that affect the normal life of urban residents; The increase of urban population caused building lot increasingly nervous, necessitating some building auxiliary facilities (refrigerating planttoom, pump house, transformer room, etc.) gradually into the building,which will make architecture interior acoustic environment complicated and deteriorated on account of the equipment vibration noise. Therefore, this article mainly analysis the sound insulation performance on the adjacent rooms and diagonal room and research the effect of flanking paths between two rooms,which explore main sound transmission path between rooms as well as the effective method to predict sound insulation and the measures to improve the sound insulation performance on the room.This article mainly uses statistical energy analysis to study the sound insulation performance of room.Firstly, the SEA models of adjacent room and diagonal room are established at the instance of the principle of statistical energy analysis,then concluding the sound transmission paths of rooms. Secondly, according to the wave equation and the boundary conditions of joints, which deduce transfer coefficients of T or cross joint and coupling loss factor between architecture construction units.Finally, each path of sound pressure level difference and the sound insulation between rooms can be calculated by the coupling loss factor between subsystems and internal loss factor subsystem on the SEA models.According to the result of the acoustic theory calculation, this paper mainly analyzes the sound transmission characteristics of each path as well as the effect of the direct path and flanking path on the sound insulation between rooms.It is shown that the adjacent room sound insulation quantity depends mainly on the first-order flanking sound transmission paths at low frequencies and on the direct sound transmission path at high frequencies.Meanwhile,for the diagonal room,its sound insulation quantity depend mainly on first-order flanking sound transmission paths and the part of the second-order flanking sound transmission paths,but the effect of paths is not the same in different frequencies. Finally, in contrast with different wall materials combination of the adjacent room and diagonal room sound insulation performance,this paper analysis different combinations of the room sound insulation properties and summarize sound insulation characteristics between two rooms along with the changes of materials. According to the analysis results indicate that as lightweight development of wall materials the adjacent room sound insulation quantity will increase at low frequencies and its sound insulation quantity relatively is poor at high frequencies, but as lightweight interior wall and heavy side walls, it will help to improve sound insulation quantity for the diagonal room.