دانش و فناوری هوافضا

دانش و فناوری هوافضا

مطالعه رفتار ترموآکوستیکی پوسته استوانه‌ای تابعی مدرج سرامیکی تقویت شده با نانولوله‌های کربنی در محیط حرارتی

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشجوی کارشناسی ارشد، مهندسی فناوری ماهواره، دانشگاه علم و صنعت ایران، تهران
2 دانشجوی دکتری، مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران
3 استاد، مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران
4 استادیار، مهندسی فضایی، دانشگاه علم و صنعت ایران، تهران
چکیده
در این مقاله رفتار ترموآکوستیک یک پوسته استوانه­ای تابعی مدرج تقویت شده با نانولوله­های کربنی در مجاورت یک گرادیان دمایی بررسی می­شود. سازه مورد نظر در مجاورت یک جریان خارجی قرار دارد و توسط یک موج صوتی مایل تحریک می­شود. پوسته از مواد سرامیکی ساخته شده و نانولوله­های کربنی به صورت درجه بندی شده در امتداد ضخامت آن توزیع شده­اند. همچنین خواص موثر مواد تشکیل دهنده به صورت وابسته به دما فرض شده­اند. برای استخراج معادلات دینامیکی حرکت پوسته، از اصل همیلتون و تئوری مرتبه سوم تغییر شکل های برشی استفاده می­شود. سپس با به کارگیری معادلات برهمکنش سیال و سازه، معادلات آکوستیکی پوسته تعیین می­گردند. در نهایت تاثیر پارامترهای موثر فیزیکی و محیطی بر انتقال صوت پوسته بررسی می­شوند. نتایج نشان می دهند که، تاثیر توزیع نانولوله­های کربنی بر انتقال صوت، در فرکانس­های بالا محسوس­تر است و افزایش دما به سبب کاهش سفتی سازه، باعث کاهش افت انتقال صوت می­گردد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Study of thermoacoustic behavior of functionally graded ceramic cylindrical shell reinforced with carbon nanotubes in thermal environment

نویسندگان English

Mohammad Bolhasani 1
Ali Tarkashvand 2
Kamran Daneshjou 3
Majid Bakhtiari 4
1 M.Sc.Student, School of Advanced Technologies, Iran University of Science & Technology, Tehran
2 PhD Student, Mechanical Engineering Department, Iran University of Science & Technology, Tehran
3 Professor, Mechanical Engineering Department, Iran University of Science & Technology, Tehran
4 Assistant Professor, School of Advanced Technologies, Iran University of Science & Technology, Tehran
چکیده English

In this paper, the thermoacoustic behavior of a functionally graded cylindrical shell reinforced with carbon nanotubes in the presence of a temperature gradient is investigated. The structure is submerged in an external flow and is excited by an oblique sound wave. The shell is made of ceramic material, and the carbon nanotubes are distributed in a graded form in the thickness direction. The effective properties of the constituents are also assumed to be temperature-dependent. Hamilton's principle and third-order shear deformation theory are used to derive the dynamic equations of shell motion. Then, using the interactions of fluid and structure, the acoustic equations of the shell are determined. Finally, the effect of physical and environmental parameters on the sound transmission of the shell is investigated. According to the results, the effect of carbon nanotube distribution on sound transmission is more significant at high frequencies, and increasing the temperature due to reducing the stiffness of the structure decreases the sound transmission loss.

کلیدواژه‌ها English

Thermoacoustic behavior
Ceramic matrix
Carbon nanotubes
Temperature gradient
third-order shear deformation theory
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