Simulation And Study On Noise Reduction Technology Of Green Building Indoor Acoustic Environment

A good indoor acoustic environment is a requirement for the comfort of acoustic environment in green buildings.Nowadays,sound environment is becoming an important factor in the evaluation of building environment.In this paper,the indoor noise of residential buildings,industrial buildings and public buildings is measured and evaluated according to the evaluation system of green buildings.The single layer and laminated glass are measured and evaluated by the acoustic module of LMS Virtual Lab software.The space sound absorber and the impedance compound muffler are simulated and analyzed.Through engineering cases,the indoor noise control technology of sound insulation,sound absorption and silencing is studied.It provides a reference for the modification of green building evaluation system and the treatment of different types of indoor noise.It is found that the sound insulation of the single-layer bedroom window is 21.7 dB(A)when the windows are open and closed,and its sound insulation performance is not up to standard.Under the condition of window closing,the low frequency noise is the main factor,and the influence of outdoor noise source on indoor acoustic environment is more serious than that of indoor noise source,and the wide-band reverberation noise formed by the mixing of several noise sources in the factory building is more serious than that of indoor noise source.The reverberation time of 1000 Hz in the rest room is 2.23 s,and its reverberation time and noise value exceed the limit stipulated by the green building standard of our country.The noise has the characteristics of wide frequency range and low frequency.According to the characteristics of indoor acoustic environment in residential buildings,the simulation of laminated glass with LMS Virtual Lab software shows that in the band of500-1000 Hz,the sound insulation of laminated glass can be increased by 2-8dB(A).PVB sandwich glass,and the sound insulation of laminated glass is more active than that of monolayer glass.For the whole sound insulation,the sound insulation effect of glass thickness difference on both sides is more ideal.The spatial sound absorption can effectively eliminate the wide band noise of low frequency,middle frequency and high frequency,among which the sound absorption effect of middle and high frequency noise is more obvious.In the simulation of the impedance compound muffler,the performance of the muffler is the lowest when the frequency is 150 Hz.In the frequency band of 20Hz-500 Hz,the performance of the muffler is improved as a whole,especially in the frequency band above 200 Hz,especially in the 475 Hz.The muffler is the best in eliminating noise in low frequency band.According to the above acoustic measurement and simulation results,the application in practical engineering cases is as follows: in the civil residential sound insulation noise reduction,laminated glass can effectively improve the low frequency band sound insulation performance;in the industrial building sound absorption noise reduction,The space sound absorber can eliminate the wide band noise,and the noise absorption effect of the middle and high frequency is remarkable.In the noise reduction of public buildings,the impedance compound muffler can eliminate the fluid noise of the wide band pipe,and the noise silencing effect in the low frequency band is obvious.