Sound insulation characteristics of small fixed windows in a laboratory and prediction with an existing theory

Acoustical science and technology

article

Marie Mimura¹  Yohei Tsukamoto³  Yoshihiro Tomikawa³  Takeshi Okuzono²  Kimihiro Sakagami² 

[1] Technology and Innovation Center;Environmental Acoustic Laboratory, Department of Architecture, Graduate School of Engineering, Kobe University;Central Research Laboratory, YKK AP Inc., YKK AP R&D Center

关键词: Reverberation room;    Sound insulation;    Sound transmission loss;    Window;   

DOI  :  10.1250/ast.43.276

学科分类：声学和超声波

来源: Acoustical Society of Japan

【 摘 要 】

Accurate prediction of the sound insulation performance of windows is an important topic because a window is an essential building component affecting the indoor sound environment of dwellings. Although some theories [1,2] have been used to predict the sound reduction index SRI of single plates, wave-based vibroacoustic numerical analysis [3] can be used for accurate assessment of airborne and structureborne sound propagation for windows of various types with a complex frame structure under appropriate numerical modeling. Nevertheless, even for fixed windows, which are the simplest window type, having a single glass and a simple frame structure, the predictive accuracy of numerical analyses has not been examined in detail because insufficient measured data are available for use as a reference for numerical analysis. Because window sizes are well known to affect SRI, verifying the predictive accuracy of numerical analyses for windows of various sizes used in actual dwellings is important. Although earlier studies [4–6] have indicated that the SRI of single plate decreases as size increases at a coincidence frequency fc, different tendencies have been reported below fc. Earlier studies on window size effect [7,8] also have indicated that SRI have small differences in size below fc, but have not studied above fc. However, we still need to clarify how the window size affects the sound insulation performance of fixed windows in detail with the discussions on the vibration characteristics and the energy loss factor of the vibrations in the window since they are highly associated with their sound insulation characteristics. These discussions on the fixed windows are not available in earlier works and will be helpful for understanding and modeling of sound insulation performance of fixed windows.

【 授权许可】

Unknown