کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6753092 1430808 2018 20 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sound absorption of a porous material with a perforated facing at high sound pressure levels
ترجمه فارسی عنوان
جذب صدا مواد متخلخل با روکش سوراخ شده در سطوح بالای فشار صدا
کلمات کلیدی
جذب صدا، مواد متخلخل روکش سوراخدار سطح فشار بالای صدا،
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی
A semi-empirical model is proposed to predict the sound absorption of an acoustical unit consisting of a rigid-porous material layer with a perforated facing under the normal incidence at high sound pressure levels (SPLs) of pure tones. The nonlinearity of the perforated facing and the porous material, and the interference between them are considered in the model. The sound absorptive performance of the acoustical unit is tested at different incident SPLs and in three typical configurations: 1) when the perforated panel (PP) directly contacts with the porous layer, 2) when the PP is separated from the porous layer by an air gap and 3) when an air cavity is set between the porous material and the hard backing wall. The test results agree well with the corresponding theoretical predictions. Moreover, the results show that the interference effect is correlated to the width of the air gap between the PP and the porous layer, which alters not only the linear acoustic impedance but also the nonlinear acoustic impedance of the unit and hence its sound absorptive properties.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Sound and Vibration - Volume 425, 7 July 2018, Pages 1-20
نویسندگان
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