Analysis And Design Of Sound-proof Windows

As a result of the development of prolificacy and progress of citilazation, it made the buildings near the airport, railroad, highway and industrial factory be immersed in the ocean of bored noise which was mainly made by city traffics, daily life and industrial factories. These buildings should be designed especially to lesson the noise incoming, to improve the ability of surrounding constructions to insulate sound transmission. It's show by former researches that the noise mainly transferred into the rooms through widows and doors, which are comparatively thin and weak to the wall. Based on this, this thesis analyses the sound-proof ability of windows.Firstly, the sound-proof performances of a single-glazing window is analyzed. The sound transmission mathematics analysis model of a single-glazing window is established by using the finite element method (FEM) theory, the sound-structure couple theory as well as vibration response and sound wave's incidence analysis to a single plate. The sound transmission loss versus the frequency is calculated by using the professional FEM software Ansys and the Vibration -Acoustics software Sysnoise. The results validate the correctness and practicability of the method.Secondly, based on the sound-proof performance analyses of the single-glazing window, this thesis analyses the sound-proof performances of the double-glazing windows. The effects of the double-glazing gap to sound transmission loss, including the quality of the gas in the gap and the distance of the gap, etc. are discussed. The effects of the structure properties of the window upon the of sound transmission loss are also studied.Finally, this thesis compares the analysis results of single-glazing window and double-glazing window, draws a conclusion of the parameters of the window which effect of sound transmission loss, deduces the effects of structure parameters to sound transmission loss of the window. Then, the optimization of the double-glazing window structure at the aim of maximum loss of sound transmission is carried out.