بررسی تحقیقات انجام شده در زمینه طراحی سیستم دیسک و پره

نوع مقاله: مقاله علمی- ترویجی

نویسندگان

1 دانشگاه جیرفت

2 دانشگاه صنعتی اصفهان

چکیده

سیستم دیسک و پره نوعی سیستم دینامیکی قوی است که ارتعاشات زیادی را تحمل می‌کند. این سیستم در مجموعه‌های گوناگونی چون پمپ‌ها، فن‌ها، موتورهای جت و هواپیما، کشتی و توربین‌های گاز و بخار کاربردهای فراوانی دارد. در این مقاله تاریخچة مدلسازی، شبیه‌سازی و تحلیل ارتعاشات سیستم دیسک و پره با تأکید بر پیشرفت‌های انجام‌شده در دهة گذشته، که سبب پیش‌بینی بهتر و درک ماکزیمم پاسخ سیستم دیسک و پره نامیزان می‌شود، بررسی شده است. برای این منظور نخست دربارة ارتعاشات سیستم‌های میزان و نامیزان بحث و چندین مدل استفاده‌شده در مطالعات پیشین ذکر شده است. در ادامه، ماکزیمم ضرایب به‌دست آمده برای سیستم‌های نامیزان آورده‌شده و روش‌های کاهش ماکزیمم پاسخ بیان شده است. در نهایت مشکلات و محدودیت‌های طراحی این سیستم‌ها در صنعت بررسی شده است. نتایج حاصل حاکی است که پاسخ ارتعاشی سیستم به وجود نامیزانی حساس است و با تغییر اندک خصوصیات هر پره، ماکزیمم پاسخ به میزان قابل توجهی افزایش می‌یابد. همچنین استفاده از راهبرد نامیزانی عمدی، تغییر آرایش چیدمان پره‌ها، استفاده از پیزوالکتریک و دمپر اصطکاکی برای کاهش ماکزیمم پاسخ سیستم مناسب است. کارکرد در محیط با دمای بالا، تنش بالا و ارتعاش قسمت‌های گوناگون از عوامل مهم شکست پره‌های سیستم به‌شمار می‌رود که در طراحی این‌گونه سیستم‌ها باید مد نظر قرار گیرند.

کلیدواژه‌ها

موضوعات


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