کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
11031429 | 1645994 | 2019 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Enhancing the sound absorption performance of porous metals using tomography images
ترجمه فارسی عنوان
افزایش عملکرد جذب صدا از فلزات متخلخل با استفاده از تصاویر توموگرافی
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کلمات کلیدی
فلزات متخلخل، جذب صدا، تصاویر توموگرافی،
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی مکانیک
چکیده انگلیسی
Commercially available porous metals are known to provide useful sound absorption, but it may be possible to modify their structures to improve their acoustical properties. Images from high-resolution X-ray computer tomography have been used to make pore-level characterization of Inconel, Recemat and Porvair foams. Based on these characterisations, flow simulations have been used to deduce parameters that determine the acoustical properties according to the Johnson-Champoux-Allard (JCA) and Delany-Bazley-Miki (DBM) models. While the DBM model enables a good agreement with measured normal incidence absorption coefficients for glass fiber materials, the JCA model enables a better agreement with data for metallic foams. The predicted sound absorption spectra were observed to depend mainly on the permeability of the porous medium being better for structures with the smallest openings and extremely poor for those with larger connectivity. It is shown that dilating the skeletal frame i.e. increasing the width of the 'struts' in a metallic foam should lead to more efficient sound absorption. It is the hope that this approach would lend itself well to use in the design of enhanced soundproofing porous metals.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Acoustics - Volume 143, 1 January 2019, Pages 183-189
Journal: Applied Acoustics - Volume 143, 1 January 2019, Pages 183-189
نویسندگان
A.J. Otaru,