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Published on: August 21, 2018
A note on the sound transmission of a spherical sound wave through a double plate structure
Xiaofeng Wang1, Bilong Liu1, Hongbo Zhang1
1School of Mechanical & Automotive Engineering, Qingdao University of Technology, 777 Jialingjiang Road 266520, Qingdao, People's Republic of China wxf_qut@163.com, liubilong@qut.edu.cn, zhbcme1@163.com.
Abstract:
The sound transmission of a spherical wave through a double plate structure is theoretically and numerically analyzed. Unlike the plane wave incidence, it is demonstrated that the sound transmission loss due to the spherical sound wave incidence follows a law of 9 dB/oct for a double-layered infinite plate. For a double-layered finite plate, the sound transmission loss is lying in between 9 dB/oct and 18 dB/oct in most frequency ranges, and depends heavily on the size and position of the plate relative to the source.
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