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Sound transmission through lined, co...

Kim, Jeong-Woo.

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Sound transmission through lined, composite panel structures: Transversely isotropic poro-elastic model.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Sound transmission through lined, composite panel structures: Transversely isotropic poro-elastic model./
作者:	Kim, Jeong-Woo.
面頁冊數:	198 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-08, Section: B, page: 4447.
Contained By:	Dissertation Abstracts International66-08B.
標題:	Engineering, Mechanical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3185786
ISBN:	9780542276798

Sound transmission through lined, composite panel structures: Transversely isotropic poro-elastic model.
Kim, Jeong-Woo.

Sound transmission through lined, composite panel structures: Transversely isotropic poro-elastic model. - 198 p.

Source: Dissertation Abstracts International, Volume: 66-08, Section: B, page: 4447.

Thesis (Ph.D.)--Purdue University, 2005.

A joint experimental and analytical investigation of the sound transmission loss (STL) and two-dimensional free wave propagation in composite sandwich panels is presented here. An existing panel, a Nomex honeycomb sandwich panel, was studied in detail. For the purpose of understanding the typical behavior of sandwich panels, a composite structure comprising two aluminum sheets with a relatively soft, poro-elastic foam core was also constructed and studied. The cores of both panels were modeled using an anisotropic (transversely isotropic) poro-elastic material theory.

ISBN: 9780542276798Subjects--Topical Terms:

783786
Engineering, Mechanical.

Sound transmission through lined, composite panel structures: Transversely isotropic poro-elastic model.
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245 1 0 $a Sound transmission through lined, composite panel structures: Transversely isotropic poro-elastic model.
300 $a 198 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-08, Section: B, page: 4447.
500 $a Major Professor: J. Stuart Bolton.
502 $a Thesis (Ph.D.)--Purdue University, 2005.
520 $a A joint experimental and analytical investigation of the sound transmission loss (STL) and two-dimensional free wave propagation in composite sandwich panels is presented here. An existing panel, a Nomex honeycomb sandwich panel, was studied in detail. For the purpose of understanding the typical behavior of sandwich panels, a composite structure comprising two aluminum sheets with a relatively soft, poro-elastic foam core was also constructed and studied. The cores of both panels were modeled using an anisotropic (transversely isotropic) poro-elastic material theory.
520 $a Several estimation methods were used to obtain the material properties of the honeycomb core and the skin plates to be used in the numerical calculations. Appropriate values selected from among the estimates were used in the STL and free wave propagation models. The prediction model was then verified in two ways: first, the calculated wave speeds and STL of a single poro-elastic layer were numerically verified by comparison with the predictions of a previously developed isotropic model. Secondly, to physically validate the transversely isotropic model, the measured STL and the phase speeds of the sandwich panels were compared with their predicted values.
520 $a To analyze the actual treatment of a fuselage structure, multi-layered configurations, including a honeycomb panel and several layers such as air gaps, acoustic blankets and membrane partitions, were formulated. Then, to find the optimal solution for improving the sound barrier performance of an actual fuselage system, air layer depth and glass fiber lining effects were investigated by using these multi-layer models.
520 $a By using the free wave propagation model, the first anti-symmetric and symmetric modes of the sandwich panels were characterized to allow the identification of the coincidence frequencies of the sandwich panel. The behavior of the STL could then be clearly explained by comparison with the free wave propagation solutions. By performing a parameter study based both on the STL and free wave propagation speeds, the mass, stiffness and damping-controlled regions of the STL were identified. The structural factors that can be adjusted to improve STL performance were also identified.
590 $a School code: 0183.
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650 4 $a Physics, Acoustics. $3 1019086
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791 $a Ph.D.
792 $a 2005
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