مجله مهندسی مکانیک

مجله مهندسی مکانیک

رفتار دوشاخگی نانولوله های کربنی احاطه شده توسط بستر الاستیک در اثر بار هارمونیک متحرک

نوع مقاله : علمی پژوهشی

نویسندگان
1 کارشناسی ارشد، گروه مهندسی مکانیک، دانشکده فنی و مهندسی، دانشگاه یاسوج، یاسوج
2 استادیار، گروه مهندسی مکانیک، دانشکده فنی و مهندسی، دانشگاه یاسوج، یاسوج
چکیده
یکی از مهم ترین کاربردهای نانولوله های کربنی (CNTs)، انتقال نانوذرات در سیستم های دارورسان است. در این کاربردها، نانولوله ها در معرض بار متحرک قرار می گیرند که منجر به ارتعاشات غیرخطی نانولوله می شود. بنابراین هدف اصلی این مطالعه، تحلیل رفتار دوشاخگی CNTs در اثر بار هارمونیک متحرک است. مدل سازی سیستم با استفاده از تئوری تیر اویلر-برنولی غیرمحلی و فنر وینکلر انجام شده است. روش های گلرکین و رانج-کوتا به ترتیب برای گسسته سازی و حل معادله حرکت به کار رفته اند. اثرات دامنه، فرکانس و سرعت نیروی هارمونیک متحرک روی پاسخ دینامیک غیرخطی سیستم، توسط نمودارهای دوشاخگی، صفحه فاز، طیف توان، مقاطع پوانکاره و ماکزیمم نمای لیاپانوف بررسی شده است. نتایج حاکی از رفتارهای غیرخطی متنوعی از جمله حرکات پریودیک، زیرهارمونیک، شبه پریودیک و آشوبناک در پاسخ سیستم است. نتایج نشان داد که در فرکانس های تحریک بالا، پاسخ سیستم با افزایش دامنه نیروی تحریک در وضعیت زیرهارمونیک باقی می ماند. ضمن اینکه با افزایش فرکانس تحریک می توان وقوع اولین رفتار نامنظم سیستم را به تأخیر انداخت.
کلیدواژه‌ها

موضوعات


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دوره 33، شماره 6 - شماره پیاپی 159
بهمن و اسفند 1403
صفحه 46-57

  • تاریخ دریافت 03 شهریور 1403
  • تاریخ بازنگری 02 مهر 1403
  • تاریخ پذیرش 24 مهر 1403