نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار، مهندسی مکانیک، دانشگاه هوایی شهید ستاری، تهران، ایران

2 استادیار، مهندسی مکانیک، دانشگاه آزاد واحد تهران جنوب، تهران، ایران

چکیده

در این پژوهش رفتار ارتعاشی و فلاتر یک ورق کامپوزیتی چند لایه یک سر گیردار در حضور جرم گسترده بررسی شده است. به‌منظور استخراج فرکانس های طبیعی با انتخاب مودهای فرضی از روش ریلی ریتز استفاده شده است. در این روش انرژی کرنشی ورق محاسبه شده و اثر جرم گسترده اضافه شده به صورت انرژی جنبشی برای سیستم لحاظ شده است. پس از حل مسئله مقدار ویژه فرکانس‌های طبیعی و حل ارتعاشات اجباری با در نظر گرفتن اثر سیال بر روی صفحه با استفاده از تئوری پیستون، سرعت فلاتر برای ورق با و بدون جرم گسترده بدست آمده است. اثر گستردگی طول یک جرم مشخص بر رفتار ارتعاشی ورق بررسی شده است. علاوه بر این، افزایش چگالی جرم اضافه شده در یک موقعیت مشخص بر سرعت فلاتر نشان داده شده است. تاثیر فاصله قرارگیری جرم گسترده از انتهای گیردار ورق مورد مطالعه قرار گرفته و تغییرات فشار آیرودینامیکی بی بعد و فرکانس بی بعد فلاتر به‌دست آمده است. در انتها با فرض چندلایه با زاویه لایه چینی‌های متفاوت رفتار ارتعاش اجباری ورق بدست آمده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation of attached mass effect on flutter speed of cantilever composite plate in supersonic flow

نویسندگان [English]

  • nader vahdat azad 1
  • Abazar Vahdat Azad 2

1 1- School of Mechanical Engineering, Shahid Sattari University of Aeronautical Engineering, Tehran, Iran

2 School of Mechanical Engineering, Islamic Azad University, South Tehran Branch, Tehran, Iran

چکیده [English]

In this study the vibration behavior of a laminated composite cantilever plate with an attached strip mass was studied. In order to extract flutter speed, the Rayleigh-Ritz method was used by choosing selected shape functions. In this method, strain energy of the plate is calculated and the effect of attached mass is considered as kinetic energy for the system. After reaching an eigenvalue problem then natural frequencies, the force vibration of the plate is analyzed by piston method and flutter speed for each case study is obtained. The effect of the attached mass length is shown. Moreover results have shown that flutter speed was reduced continuously by increasing the mass density. Also by considering a specific laminate with different orientation of layers flutter speed is obtained. At the end attached mass offset from clamped edge is analyzed. In this paper effect of attachment mass, mass length and mass position on plate flutter frequency is analyzed. The results obtained through this study reveal that strip mass density, attached mass length, orientation of composite layers and attached mass position can change the system critical dynamic pressure significantly.

کلیدواژه‌ها [English]

  • Cantilever Composite plate
  • force vibration
  • Attached mass
  • Rayleigh-Ritz
  • flutter speed

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