تحلیل آیروالاستیک پانل‌های انحنادار تقویت‌شده با نانو صفحات گرافنی

نوع مقاله : گرایش دینامیک، ارتعاشات و کنترل

نویسندگان

1 دانشکده مهندسی مکانیک دانشگاه پدافند هوایی خاتم الانبیاء (ص)

2 دانشگاه مالک اشتر مجتمع هوافضا

3 دانشکده مهندسی مکانیک دانشگاه شهید باهنر کرمان

چکیده

در این مقاله، تحلیل ارتعاشات و پایداری پانل هدفمند ساندویچی چندلایه تقویت‌شده با نانوصفحات گرافن و محصورشده با لایه‌های پیزوالکتریک تحت‌تأثیر نیروی آیروالاستیک مطالعه شده است. پانل ساندویچی چندلایه دو جهت انحنادار از مواد متخلخل که با نانو صفحات گرافنی تقویت شده‌اند، در نظر گرفته می‌شود. نانوصفحات گرافن به صورت‌های یکنواخت و غیریکنواخت و همچنین سه نوع توزیع تخلخل هدفمند که به‌صورت لایه و پیوسته در راستای ضخامت تغییر می‌کند فرض شده است. این سازه‌ همواره تحت تأثیر جریان‌ خارجی سیال که با تئوری پیستون مدل‌سازی می‌شود در نظر گرفته شده است. برای استخراج معادلات حاکم بر حرکت به همراه شرایط مرزی از اصل توسعه یافته همیلتون با در نظر گرفتن تئوری‌ مرتبه بالا استفاده شده است. برای گسسته‌سازی معادلات با مشتقات جزئی به معادلات با مشتقات معمولی، از روش‌ گلرکین استفاده می‌شود. تأثیر مواد پیشرفته شامل الگوهای مختلف توزیع تخلخل، ضرایب تخلخل، توزیع یا پراکندگی نانو صفحات گرافن، مقدار کسر وزنی آن‌ها و همچنین، تأثیر ابعاد هندسی سازه‌ بر روی ارتعاشات و ناپایداری‌های دینامیکی سازه‌ها مطالعه می‌شوند.

کلیدواژه‌ها


عنوان مقاله [English]

Aeroelastic Analysis of Reinforced Curved Panels by Nano-Graphene Plates

نویسندگان [English]

  • Alireza Pourmoayed 1
  • karamat Malekzadeh fard 2
  • Reza Bahaadini 3
1 Mechanical Engineering Department, Khatamul-Anbiya Air Defense University, Tehran, Iran
2 malek ashtar university
3 Mechanical Engineering Department Shahid Bahonar University of Kerman
چکیده [English]

In this study, the vibration and stability analysis of functionally graded (FG) doubly curved panels reinforced with nano-graphene platelets (NGPLs) embedded by piezoelectric layers under the influence of aeroelastic force are investigated. Multilayer sandwich doubly curved panel makes of porous materials reinforced with nano-graphene platelets are considered. The NGPLs are assumed to be uniform and non-uniform distribution, as well as three types of targeted porosity distribution that change continuously along the thickness in each layer. This structure is always under influence of external fluid flow and modeled by the piston theory. Based on the higher-order shear deformation theory, the governing equations of motion of doubly curved panels reinforced with NGPL are obtained using extended Hamilton’s principle. Galerkin method is employed to transform the partial differential equations of motion into the ordinary equations. The effect of advanced materials including various patterns of porosity distribution, porosity coefficients, distribution or dispersion of nano graphene platelets, NGPL weight fraction, as well as the effect of structural geometric dimensions on vibrations and dynamic instabilities of structures are studied.

کلیدواژه‌ها [English]

  • Vibration and Stability
  • Sandwich Panel
  • Supersonic Fluid Flow
  • Piezoelectric Layers

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