Pilot study on numerical prediction of sound reduction index of double window system: Comparison of finite element prediction method with measurement

Acoustical science and technology

article

Marie Mimura¹  Takeshi Okuzono²  Kimihiro Sakagami² 

[1] Technology and Innovation Center;Environmental Acoustical Laboratory, Department of Architecture, Graduate School of Engineering, Kobe University

关键词: Sound insulation;    Sound reduction index;    Finite element method;    Double window;   

DOI  :  10.1250/ast.43.32

学科分类：声学和超声波

来源: Acoustical Society of Japan

【 摘 要 】

The development of windows with high sound insulation performance is essential for preventing the infiltration of traffic noise and the leakage of room noise. A numerical prediction is an effective means of reducing sound insulation testing and development costs to develop a quietness window. As a numerical prediction method for the sound reduction index, the finite element method (FEM) is useful in dealing with structure-acoustic problems. This study was conducted as a pilot study toward developing an accurate numerical model to predict the sound reduction index of a double window. We discussed the accuracy of an FEM model for predicting the diffuse incidence sound reduction index of double windows through a comparison with measured values for a simplified realistically scaled double window. The FE results were compared with measured ones for eight cases with and without a frame absorber. Results showed that the best match to measured values is obtained when using a frame absorber in all the perimeters inside the air cavity. Also, a better agreement is obtained at frequencies of 160–2,000 Hz in other cases. However, a marked discrepancy is found at frequencies above 2,000 Hz and below 160 Hz. Possible reasons for the discrepancies are also discussed.

【 授权许可】

Unknown