اثر تغییر گام بر فرکانس های یک ملخ گام متغیر بصورت تحلیلی، عددی و تجربی

الهامی, محمد رضا; نجفی, محمد رضا; پناهنده, اسداله

doi:10.30506/ijmep.2023.526512.1773

اثر تغییر گام بر فرکانس های یک ملخ گام متغیر بصورت تحلیلی، عددی و تجربی

نوع مقاله : مقاله علمی پژوهشی

نویسندگان

¹ دانشیار، گروه مهندسی مکانیک، دانشکده فنی و مهندسی، دانشگاه جامع امام حسین(علیه السلام)، تهران، ایران

² استادیار، گروه مهندسی مکانیک، دانشکده فنی و مهندسی، دانشگاه جامع امام حسین(علیه السلام)، تهران، ایران

³ کارشناسی ارشد، گروه مهندسی مکانیک، دانشکده فنی و مهندسی، دانشگاه جامع امام حسین(علیه السلام)، تهران، ایران

10.30506/ijmep.2023.526512.1773

چکیده

در این مقاله اثر تغییر گام بر فرکانس‌ های یک ملخ گام متغیر به‌ صورت تحلیلی، عددی و تجربی مورد بررسی قرار گرفته است. ابتدا معادلات ارتعاشات آزاد پره‌ی ملخ با استفاده از روش گالرکین استخراج شد. از اسکنر سه ‌بعدی برای به دست آوردن پروفیل پره و آزمایش تراست استاتیکی جهت تعیین شرایط بارگذاری ملخ استفاده شد. به ‌منظور آزمون مودال در حالت دورانی، شبیه‌ سازی آنالیزمودال به کمک نرم‌ افزار آباکوس انجام و نتایج با آزمون مودال تجربی در حالت استاتیکی صحت‌ سنجی شد. نتایج تجربی مانند روش تحلیلی نشان داد که با افزایش گام، فرکانس طبیعی در مودهای فرد کاهش و در مودهای زوج افزایش می ‌یابد. درنهایت نیز دیاگرام اسپک رسم گردید که هیچ‌ گونه مشکل رزونانسی در شرایط کاری پره ملخ وجود نداشت

کلیدواژه‌ها

موضوعات

دینامیک، ارتعاشات و کنترل

مراجع

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