کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
560331 1451871 2014 16 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Indirect acoustic impedance eduction in presence of flow based on an analytical two-port formulation
ترجمه فارسی عنوان
ارزیابی امپدانس آکوستیک غیر مستقیم در حضور جریان بر اساس یک فرمول تحلیلی دو پورت
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر پردازش سیگنال
چکیده انگلیسی


• We present an analytical methodology for the grazing flow acoustic impedance eduction.
• The methodology is verified by comparison with acoustic finite element simulations.
• Experiments are performed and results are compared with reference results.
• It advantages by sample non-destructivity, easy rig construction and reduced number of microphones.

In order to assess the performance of advanced acoustic absorbing materials the acoustic impedance should be determined with high accuracy, especially, in presence of a grazing flow. This paper presents an analytical methodology for the grazing flow acoustic impedance eduction, based on a two-port representation of an acoustic system. This procedure is dedicated to the frequency range below the cut-on frequency of the transversal duct modes and its major appeal refers to a reduced number of microphones and the experimental rig simplicity. The methodology is verified by comparison with acoustic finite element simulations. Experiments are performed on two liner configurations and the educed impedance is compared with reference results obtained with a different approach at another test rig, and shows good agreement. A sensitivity analysis on the influence of the input parameters is carried out showing the influence of the rigid-/impedance wall transition effects, flow Mach number, number of microphones and microphone positioning accuracy.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Mechanical Systems and Signal Processing - Volume 48, Issues 1–2, 3 October 2014, Pages 388–403
نویسندگان
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