تحلیل دینامیکی پوسته‌های استوانه‌ای تقویت‌شده تحت فشار داخلی متحرک

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد- دانشکده مکانیک و فناوری های ساخت - دانشگاه صنعتی مالک اشتر - تهران - ایران

2 پژوهشکده مکانیک و فناوری های ساخت/مجتمع دانشگاهی مواد و فناوری های ساخت/دانشگاه صنعتی مالک اشتر/تهران

چکیده

پوسته‌های استوانه‌ای تقویت شده کاربرد فراوانی در بسیاری از شاخه‌های مهندسی از قبیل کشتی‌ها، زیردریایی و مخازن سوخت هواپیما  دارد. در اکثر این موارد پوسته تحت بارهای دینامیکی قرار می‌گیرد. یکی از بار‌های دینامیکی که می‌تواند به این پوسته‌ها وارد شود فشار داخلی متحرک می‌باشد. تحلیل پوسته استوانه‌ای تقویت شده تحت فشار داخلی متحرک در این پژوهش مورد مطالعه قرار گرفته است. معادلات حرکت بر اساس تئوری کلاسیک پوسته  با استفاده از روش همیلتون استخراج شده‌اند. شرایط مرزی پوسته دو سر ساده در نظر گرفته شده است. مؤلفه‌های جابه‌جایی با توجه به شرایط مرزی به‌صورت بسط سری فوریه دوگانه نوشته شده‌اند. برای بدست آوردن فرکانس طبیعی و پاسخ پوسته استوانه‌ای تحت بارگذاری متحرک داخلی معادلات حرکت با استفاده از روش توابع وزنی گالرکین حل شد‌ه‌اند. برای به‌دست‌آوردن فرکانس‌های طبیعی و پاسخ زمانی پوسته کدهایی به زبان فرترن نوشته شد‌ه‌اند و نتایج با پاسخ مراجع دیگر و پاسخ نرم افزار آباکوس مقایسه شده‌اند و در نهایت تأثیر پارامترهای هندسی بر فرکانس‌های طبیعی و پاسخ زمانی پوسته استوانه‌ای تقویت شده تحت فشار داخلی متحرک بررسی شده است و نتایج برای پوسته تقویت‌نشده و پوسته تقویت‌شده با تقویت‌کننده‌های مختلف مقایسه شده‌اند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Free and Forced Vibration Analysis of Stiffened Cylindrical Shells under Moving Internal Pressure

نویسندگان [English]

  • Reza Arab 1
  • Hosein Lexian 2
1 MSc student, Mechanical Engineering,- Malek Ashtar University of Technology (MUT), -Tehran,- Iran
2 Malek-e-Ashtar University of Technology/ Faculty of Materials & Manufacturing Processes
چکیده [English]

Cylindrical shells are used tremendously in many engineering fields such as ships, submarines, and fuel tanks in airplanes. In many cases, shells are exposed to dynamic loads. One of the dynamic loads in shells is internal moving pressure. Analysis of cylindrical stiffened shells under moving internal pressure are investigated in this research. Equations of motion are based on classic shell theory and derived from Hamilton’s method. Boundary conditions are assumed simply support. Displacement components are assumed Fourie double series based on boundary conditions. Equations of motions are solved by Galerkin weighted functions method for calculation of natural frequency and dynamic response of cylindrical shells under moving internal pressure. Codes in FORTRAN are used to derive the natural frequency and dynamic response of cylindrical shells. Results are compared with other references and Abaqus software. The effect of geometrical parameters on natural frequency and dynamic response of cylindrical shells under moving internal pressure are investigated finally and results for stiffened shells and unstiffened shells with different stiffeners are compared.

کلیدواژه‌ها [English]

  • Cylindrical Shells
  • Ring & stringer stiffeners
  • free vibration
  • Dynamic analysis
  • Moving internal pressure
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