نوع مقاله : مقاله پژوهشی

نویسنده

استادیار، دانشکده مهندسی مکانیک، دانشگاه علم وصنعت ایران، تهران، ایران

10.22068/jstc.2019.90487.1459

چکیده

در مقاله ی حاضر، روش بسط تابع امواج به منظور مطالعه ی پدیده ی بازتابش امواج هارمونیک آکوستیکی از پوسته ی استوانه ای کامپوزیتی جداره ضخیم با ساختار تقویت شده با الیاف با چیدمان حلزونی و مستغرق در سیال ایده آل، استفاده می گردد. یک روش تقریبی مبتنی بر مدل لایه ای در قالب فرمولاسیون فضای حالت و با استافده از روش ماتریس انتقال، جهت حل رفتار الاستیک سه بعدی ناشی از بارگذاری آکوستیکی استفاده می گردد. با توجه به رفتار نامتقارن پدیده ی انتشار امواج بر روی لوله ی کامپوزیتی ناهمسانگرد مورد بررسی و با استفاده از تئوری بازتابش روزنانسی، میدان رزونانس بازتابشی سازه مستتر درون سیگنال های امواج بازتابش یافته (فشار آکوستیکی)، از میدان بازتابش پس زمینه تفکیک گردیده و مشخصه های روزنانسی ایزوله می گردد. سپس، مولفه های رزونانسی سازه بر اساس مود محیطی پایه، شماره ی زیر مود آن و جهت انتار موج پایه در دو جهت راست گرد یا چپ گرد حول محور اصلی سازه تفکیک می گردند. در نهایت، با هدف کنترل کیفی، ارزیابی کمی و شناسایی مشخصه های موادی سازه، آنالیز حساسیت بر روی فرکانس های رزونانسی سازه ی کامپوزیتی گرافایت/اپوکسی صورت می پذیرد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Acoustic scattering from helically wounded fiber reinforced composite cylindrical shells: Resonance isolation, identification and classification and bifurcation phenomenon

نویسنده [English]

  • Majid Rajabi

School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran

چکیده [English]

The method of wave function expansion is adopted to study the three dimensional scattering of a plane progressive harmonic acoustic wave incident upon an arbitrarily thick-walled helically filament-wound composite cylindrical shell submerged in and filled with compressible ideal fluids. An approximate laminate model in the context of the so-called state space formulation is employed for the construction of T-matrix solution to solve for the unknown modal scattering coefficients. Considering the nonaxisymmetric wave propagation phenomenon in anisotropic cylindrical components and following the resonance scattering theory (RST) which determines the resonance and background scattering fields, the stimulated resonance frequencies of the shell are isolated and classified due to their fundamental mode of excitation, overtone and style of propagation along the cylindrical axis (i.e., clockwise or anticlockwise propagation around the shell) and are identified as the helically circumnavigating waves. The solution is particularly used for the quantitative sensitivity analysis of excited resonance frequencies of an air-filled and water submerged Graphite/Epoxy cylindrical shell to the perturbation in the material’s elastic constants.

کلیدواژه‌ها [English]

  • Acoustic Non-destructive evaluation
  • Material Characterization
  • Fiber-Reinforced Composite material
  • Surface waves
  • Sensitivity analysis
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