Citation

Sieck CF, Lau SK. J. Acoust. Soc. Am. 2011; 130(4): 2389.

Affiliation

Architectural Eng., Univ. of Nebraska-Lincoln, 203C PKI, 1110 S 67th St., Omaha, NE 68182-0681, cfsieck@gmail.com.

Copyright

(Copyright © 2011, American Institute of Physics)

DOI

10.1121/1.3654571

PMID

21973749

Abstract

Sound transmission loss through an exterior wall is limited by its weakest structure, generally a window, especially if it is open. Considering the acoustic modes within a window and a room are important because much of the acoustic energy from noise sources such as traffic and large wind turbines is in the low to middle frequency range. Previous models of open windows have either neglected the thickness of the window or the influence of room modes on the sound transmission. The present investigation considered a baffled rectangular aperture of finite thickness backed by a rigid walled cavity. An impedance/mobility approach was used to study the effect of the thickness of an open window on the insertion loss and sound pressure levels inside the cavity. The insertion loss study was confirmed using FEM modeling, and the difference in sound pressure levels was compared to experimental results. Increasing window thickness decreases the amount of sound transmitted at frequencies below the second order modes of the cavity for both window sizes under investigation. Using the impedance/mobility approach was effective in this study and allows the model to be easily extended.

Language: en