دانش و فناوری هوافضا

دانش و فناوری هوافضا

بررسی رفتار پراکندگی امواج صوتی پوسته استوانه‌ای ویسکوالاستیک تابعی با وجود تقویت‌کننده‌های حلقوی و محوری در مجاورت جریان مادون صوت

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشجوی کارشناسی ارشد، مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران.
2 دانشجوی دکتری، مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران.
3 دانشجوی کارشناسی ارشد، مهندسی هوافضا، دانشگاه علم و صنعت ایران، تهران.
4 استاد، مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران
چکیده
در این مقاله پراکندگی صوتی یک پوسته استوانه‌ای ویسکوالاستیک تابعی مدرج با طول بی‌نهایت، با وجود تقویت‌کننده‌های حلقوی و محوری در سطح بیرونی و تحریک شده توسط یک موج صوتی مایل، مورد بررسی قرار می‌گیرد. پوسته استوانه‌ای از مواد ویسکوالاستیک تابعی ساخته شده و خواص پوسته بر اساس رابطه توزیع توانی در جهت شعاع متغیر هستند. در ضمن تقویت‌کننده‌های حلقوی و محوری در سطح خارجی پوسته می‌باشند. از تئوری تغییر شکل برشی مرتبه اول مبتنی بر اصل همیلتون برای استخراج معادلات حرکت پوسته استفاده می‌شود. همچنین تقویت‌کننده‌های حلقوی و محوری بصورت منتجه‌های نیرو و ممان با پوسته کوپل شده‌اند. در ادامه با استفاده از معادلات برهم‌کنش سازه و سیال، معادلات ارتعاشات آکوستیکی و پراکندگی صوتی سازه بدست می‌آیند. در نهایت تاثیر پارامترهای هندسی، مکانیکی و فیزیکی سازه بر پراکندگی صوتی بررسی می‌شوند. نتایج نشان می‌دهند که تغییرات ضخامت، پهنا و فاصله تقویت‌کننده‌ها تاثیر بسیار زیادی بر پراکندگی صوت سازه دارند.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Investigation of acoustic wave scattering behavior of a functionally graded viscoelastic cylindrical shell with ring and stringer stiffeners in the presence of subsonic flow

نویسندگان English

Tohid Mardaneh 1
Ali Tarkashvand 2
Mahmood Raeiszadekooshkghazi 3
Kamran Daneshjou 4
1 M.Sc. Student, Mechanical Engineering Department, Iran University of Science & Technology, Tehran.
2 Ph. D student, School of Mechanical engineering, Iran University of Science and Technology, Tehran.
3 M.Sc. Student, Mechanical Engineering Department, Iran University of Science & Technology, Tehran.
4 Professor, Mechanical Engineering Department, Iran University of Science & Technology, Tehran
چکیده English

In this paper, the acoustic scattering of an infinitely long functionally graded viscoelastic cylinder, reinforced with ring and stringer stiffeners and excited by an oblique acoustic wave, is investigated. The cylinder is made of functionally graded viscoelastic material, and its properties vary along the radial direction according to a power law distribution. The ring and stringer stiffeners are located on the outer surface of the shell. First-order shear deformation theory based on Hamilton's principle is used to derive the shell’s motion equations. The ring and stringer stiffeners are coupled with the shell as force and moment resultants. Then, using structure–fluid interaction equations, the acoustic vibration equations of the structure are obtained. Finally, the effects of geometrical, mechanical, and physical parameters on acoustic scattering are investigated. The results show that changes in the thickness, width, and spacing of the stiffeners have a significant effect on the acoustic scattering of the structure.

کلیدواژه‌ها English

Vibroacoustic
acoustic scattering
functionally graded viscoelastic materials
stiffeners
first-order shear deformation theory
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