علوم و فناوری کامپوزیت

علوم و فناوری کامپوزیت

بازطراحی،تحلیل مودال و تحلیل تنش تیر تقویتی داشبورد

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشیار، مهندسی مکانیک،دانشکدگان فنی،دانشگاه تهران.
2 کارشناسی ارشد، مهندسی مکانیک، دانشگاه تهران، تهران.
چکیده
در قلب داشبورد یک خودرو، یک ساختار پشتیبانی کننده با عنوان تیر تقویتی داشبورد برای تحمل بارها و پاسخ به نیروهای تصادف وجود دارد. تیر تقویتی داشبورد ستون اصلی داشبورد شناخته می-شود. چرا که عملکرد آن شامل ایمنی، پشتیبانی سازه‌ای از مجموعه داشبورد و برآورده کردن استانداردهای صدا، لرزش و سفتی می‌باشد. اگر فرکانس‌های طبیعی ساختار تیر تقویتی داشبورد با یکی از فرکانس‌های تحریک کننده آن همپوشانی داشته باشند، پدیده‌ای به نام تشدید رخ می‌دهد. با توجه به پایین بودن سفتی تیر تقویتی موجود، برای جلوگیری از این پدیده مخرب، پاسخ مودال مجموعه تیر تقویتی مورد مطالعه و اصلاح قرار گرفت. در این مقاله با تغییر جنس تیر تقویتی از فلزی به کامپوزیتی پایه پلیمری،تیر مورد طراحی مجدد قرار گرفت و عملکرد ارتعاشی و تحلیل تنش آن انجام شد. شبیه سازی‌ها نشان داد تغییر جنس تیر فلزی به کامپوزیت شیشه/ اپوکسی، کربن/ اپوکسی و چندلایه فلز/ الیاف/ اپوکسی باعث افزایش 18 درصدی فرکانس طبیعی می‌شود. به منظور جلوگیری از تشدید به مقدار بیشتری افزایش فرکانس طبیعی نیاز است لذا در کنار تغییر جنس به کامپوزیت، برای کاهش درجه آزادی تیر تعدادی تکیه‌گاه جهت اتصال تیر به بدنه خودرو، اضافه شد. اعمال هم زمان تغییر جنس و کاهش درجه آزادی افزایش 460 درصدی فرکانس طبیعی را در پی داشت. از آن‌جایی که افزایش بیش از حد فرکانس طبیعی منجر به بالا رفتن صلبیت سازه و در نتیجه تمرکز تنش خواهد شد، تحلیل عددی تنش صورت گرفت و در نهایت لایه چینی مناسب برای تیر تقویتی داشبورد پیشنهاد گردید.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Redesign, modal analysis and stress analysis of cross car beam

نویسندگان English

Majid Safarabadi 1
Mohsen Sedaghat 2
1 School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran.
2 School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran.
چکیده English

As components of the car's dashboard, there is a support structure which is called cross-car beam (CCB). This beam bears the loads and respond to crash forces. Cross-car beam is essential, because its functions include safety, structural support of the instrument panel and passing sound, vibration and harshness (NVH) standards. If the natural frequencies of the cross-car beam overlap with one of the excitement frequencies, a phenomenon known as resonance occurs. According to the low stiffness of the cross-car beam, the modal response of the cross-car beam should be studied and modified to avoid this destructive phenomenon. In this article, by changing the material of the cross-car beam from steel to polymer-based composite, the beam was redesigned and its vibration performance and stress analysis were performed. The simulations showed that changing the material of the metal beam to glass-epoxy composite, carbon-epoxy composite and fiber in metal laminate (FML) increased the natural frequency by 18%. In order to avoid resonance, more increasing is required for natural frequency amount. Therefore, several supports were added to connect beam to car body and reduce degree of freedom. Changing the material and increasing supports at the same time resulted 460% increasing for natural frequency. Because excessive increase of natural frequency will lead to increasing structure rigidity and as a result stress concentration, so numerical stress analysis was done and finally a suitable laminated composite was suggested for cross-car beam.

کلیدواژه‌ها English

Cross car beam
Resonance
Natural frequency
Fiber metal laminate
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