مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

بررسی سرعت فلاتر و تاثیر لایه چینی بال کامپوزیتی با دو موتور متصل

نویسندگان
1 دانشجوی کارشناسی ارشد، سازه های هوایی، دانشگاه خواجه نصیرالدین طوسی، تهران
2 هیئت علمی/ دانشکده هوافضا دانشگاه صنعتی خواجه نصیرالدین طوسی
3 هیئت علمی دانشگاه تهران
4 دانشجوی دکتری، سازه های هوایی، دانشگاه خواجه نصیرالدین طوسی، تهران
چکیده
در این مقاله سرعت فلاتر بال کامپوزیتی با دو موتور متصل مورد بررسی قرار گرفته است. بال مورد نظر به صورت یک تیر یک سر گیردار و دارای دو درجه آزادی و همچنین به همراه دو نیروی پشران تعقیب کننده و جرم موتورها مدل سازی شده است. برای مدل سازی آیرودینامیک از تئوری واگنر استفاده شده و معادلات حاکم بر حرکت بال با استفاده از روابط لاگرانژ و با در نظر گرفتن مودهای فرضی بدست آمده است. سرعت فلاتر خطی نیز با استفاده از روش مقدار ویژه محاسبه شده است. برای صحت سنجی کار انجام شده ابتدا بال کامپوزیتی بدون موتور و سپس با در نظر گرفتن دو موتور با نتایج پیشین مقایسه شده است که همخوانی خوبی بین نتایج مشاهده گردیده است. بال کامپوزیتی هم بصورت تک لایه و هم بصورت چند لایه مورد تحلیل قرا گرفته و تاثیر پارامترهای مختلف از قبیل تغییر اندازه نیروی پیشران وجرم موتورها و همچنین موقعیت قرارگیری موتورها و افزایش تعداد لایه‌های کامپوزیت بررسی شده است و نتایج حاصل نشان می‌دهد با افزایش جرم و نیروی پیشران موتورها و همچنین با افزایش فاصله طولی موتور از ریشه بال، سرعت فلاتر کاهش می‌یابد و با نزدیک شدن موتورها به لبه حمله سرعت فلاتر افزایش یافته است.
کلیدواژه‌ها

عنوان مقاله English

The flutter speed and effect of laminate layers of composite wing carrying two powered engines

نویسندگان English

saied moharami 1
Saied Irani 2
Shahrokh Shams 3
MohammadReza Fallah 4
1 student of Aerospace Engineering, K. N . University of Technology, Tehran, Iran.
3 Department of new sciences and technologis
4 student of Aerospace Engineering, K. N . University of Technology, Tehran, Iran
چکیده English

In this article, the Flutter speed of a composite wing carrying two power engines is analyzed. The wing is modeled as a beam with two degrees of freedom, which is a cantilever, with two thrust as a follower force and mass of the engines. Wagner theory has been used for aerodynamic model and using the assumed mode, the wing dynamic equations of the motion has been achieved by Lagrange equations. Linear flutter speed according to the eigenvalues of the motion equations was calculated. In order to valid the results of present work, at first composite wing assumed without engines and then wing modeled with two engines that results are compared with published results and good agreement has been observed. Composite wing has been analyzed as one layer and also laminate layers, and effect of variables such as follower force, engines mass, position of engines and number of layers has been investigated and the results show that with increase in mass and force of engines and also with increases distance between engine and wing root, flutter speed decreases and with decrease distance between engines and leading edge, flutter speed increases.

کلیدواژه‌ها English

Instability
Flutter
Wing
Composite
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