بررسی عددی تأثیر خواص مکانیکی مواد دارای تطبیق امپدانس با محیط زیر آب بر ضریب جذب صوت با روش اجزای محدود

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی مکانیک، دانشگاه تفرش، تفرش، ایران

چکیده

در این مطالعه، پنج ماده که برای طراحی و ساخت جاذب‌های آکوستیکی مورد استفاده قرار می‌گیرند، مورد بررسی قرار گرفته‌اند. از روش اجزای محدود به کمک نرم‌افزار کامسول برای اندازه‌گیری ضریب جذب صوت زیر آب استفاده شده است. نحوه ایجاد شبیه‌سازی به صورت متقارن محوری برای کاهش حجم محاسبات، توضیح داده شده است؛ همچنین اعمال شرایط مرزی و تولید امواج آکوستیکی نیز مورد بررسی قرار گرفته است و تأثیر خواص مکانیکی مواد، از جمله مدول یانگ، چگالی و ضریب تلفات، بر ضریب جذب صوت زیر آب تحلیل شده است. نتایج نشان می‌دهد با بیشتر شدن مدول یانگ موادی همچون لاستیک بوتادین نیتریل که ذاتا مدول یانگ پایینی دارند؛ ضریب جذب صوت در محدوده فرکانسی 0.2 تا 10 کیلوهرتز به صورت چشمگیری نسبت به سایر مواد افزایش می‌یابد. مواد دارای ضریب تلفات بالا نسبت به سایر مواد ضریب جذب صوت را در فرکانس‌های زیر 1 کیلوهرتز افزایش می‌دهند. موادی همچون لاستیک استایرون بوتادین که چگالی نزدیک به چگالی آب را دارند، تطبیق امپدانس مناسبی با محیط زیر آب را دارند و ضریب جذب صوت در حد عالی در بازه فرکانسی 2 تا 10 کیلوهرتز را دارند که این امر به سایر خواص مواد هم وابسته است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Numerical investigation of the effect of mechanical properties of impedance-matched materials with the underwater environment on acoustic absorption using the finite element method.

نویسندگان [English]

  • Amir Hosein Moradi
  • Abolfazl Hasani Baferani
Department of Mechanical Engineering, Tafresh University, Tafresh, Iran
چکیده [English]

In this study, five materials used for the design and manufacture of acoustic absorbers have been investigated. The finite element method has been used with the help of COMSOL software to measure the underwater sound absorption coefficient. The method of creating an axisymmetric simulation to reduce the volume of calculations has been explained; the application of boundary conditions and the generation of acoustic waves have also been investigated, and the effect of the mechanical properties of the materials, including Young's modulus, density, and loss coefficient, on the underwater sound absorption coefficient has been analyzed. The results show that with the increase in the Young's modulus of materials such as nitrile butadiene rubber, which inherently has a low Young's modulus; the sound absorption coefficient in the frequency range of 0.2 to 10 kHz increases significantly compared to other materials. Materials with a high loss coefficient increase the sound absorption coefficient at frequencies below 1 kHz compared to other materials. Materials such as styrene-butadiene rubber, which has a density close to that of water, have a good impedance match with the underwater environment and have excellent sound absorption coefficients in the frequency range of 2 to 10 kHz, which also depends on other material properties.
 

کلیدواژه‌ها [English]

  • Underwater Sound Absorption
  • Young's Modulus
  • Density
  • Loss Coefficient
  • Impedance Matching

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نشریه مهندسی مکانیک امیرکبیر
دوره 57، شماره 1
1404
صفحه 43-68

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