کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10132901 1645583 2019 16 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Passive constrained viscoelastic layers to improve the efficiency of truncated acoustic black holes in beams
ترجمه فارسی عنوان
لایه های ویسکولاستیک منعطف منفعل برای بهبود بهره وری سیاه چاله های صوتی کوتاه شده در پرتوها
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر پردازش سیگنال
چکیده انگلیسی
Power-law profiles at the edges of beams and plates have proved to be a very efficient way to attenuate vibrations. In an ideal scenario, for a profile with zero end thickness, the energy of flexural vibrations would never reflect from the boundaries, giving place to the Acoustic Black Hole (ABH) phenomenon. In practice, however, the edge must be truncated which results in a non-zero reflection coefficient. To partially mitigate this problem, a viscoelastic layer (VL) is typically placed at the tip of the ABH termination to compensate for the effects of truncation. Instead, in this work it will be shown that one can achieve better results by resorting to passive constrained viscoelastic layer (PCVL). The latter consists of a sandwich made of a viscoelastic layer (VL) plus a constrained layer (CL). An analytical model is developed to describe the performance of a truncated ABH beam with PCVL, where the displacement fields are expanded by means of Gaussian functions. The model is validated through finite element (FEM) simulations and experiments. It is observed that a truncated ABH beam with PCVL at the tip performs better than an ABH beam with an unconstrained VL, even if they add equal mass to the system.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Mechanical Systems and Signal Processing - Volume 118, 1 March 2019, Pages 461-476
نویسندگان
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