تحقیقات موتور

تحقیقات موتور

تحلیل استاتیکی، خستگی و کمانش شاتون به روش المان محدود

نوع مقاله : مقاله پژوهشی

نویسندگان
گروه مهندسی مکانیک، دانشگاه ملی مهارت، تهران، ایران
چکیده
دسته سمبه‏ یکی از مهم‌ترین بخش‌‏های همبندی‌شده موتور است که انرژی را از سمبه‏ به میل‌‏لنگ منتقل می­‌کند و حرکت خطی و رفت و برگشتی سمبه‏ را به حرکت چرخشی میل‌‏لنگ تبدیل می‌­نماید. دسته سمبه‏ در شرایط بسیار پیچیده­‌ای کار می‌­کند و نه تنها به دلیل سازوکار دسته سمبه‏، بلکه به دلیل نیروهای لختی نیز تحت فشار قرار می­‌گیرد. رفتار آن تحت تأثیر پدیده خستگی ناشی از بارهای چرخه‏‌ای برگشت‏‌پذیر است. در این پژوهش تحلیل استاتیکی و خستگی و کمانش دسته سمبه‏ به روش اجزاء محدود و با استفاده از نرم‏‌افزار انسیس انجام شد. بدین منظور ابتدا ابعاد دسته سمبه‏ با دقت 0.1 میلی‌متر اندازه‌گیری و سپس در نرم‌‏افزار سالیدورکز طراحی شد و سپس برای تحلیل به نرم‏‌افزار انسیس منتقل گردید. با توجه به فشار مؤثر متوسط استوانه‏ برای تراکتور U650 (0.8 مگاپاسکال) و بازده مکانیکی موتور (0.7)، مقدار نیروی حداکثر 9500 نیوتن محاسبه شد. نتایج نشان داد حداکثر تنش کششی و فشاری برابر با 25.25 مگاپاسکال است که در نزدیکی سر کوچک دسته سمبه‏ رخ می‌دهد و تغییر طول کلی ناشی از تنش کششی 0.018 میلی‌متر به دست آمد. همچنین، تعداد چرخه‏‌های مجاز برابر با 108 و حداقل ضریب اطمینان 3.7 تعیین شد.
کلیدواژه‌ها

عنوان مقاله English

Static analysis, fatigue and buckling of connecting rod by finite element method

نویسندگان English

Bahman Rahmatinejad
Hossein Rahimi Asiabaraki
Farzin Azimpour Shishevan
Department of Mechanical Engineering, National University of Skills (NUS), Tehran, Iran
چکیده English

The connecting rod is one of the most important components of an assembled engine, transferring energy from the piston to the crankshaft and converting the linear and reciprocating motion of the piston into the rotational motion of the crankshaft. The connecting rod operates under very complex conditions and is subjected to stress not only due to its mechanism but also because of inertial forces. Its behavior is influenced by fatigue phenomena resulting from cyclic reversible loads. In this study, the static analysis, fatigue, and buckling of the connecting rod were performed using the finite element method and the ANSYS software. Initially, the dimensions of the connecting rod were measured with an accuracy of 0.1 millimeters and then modeled in SolidWorks before being transferred to ANSYS for analysis. Considering the average effective pressure of the cylinder for the U650 tractor (0.8 megapascals) and the mechanical efficiency of the engine (0.7), the maximum force was calculated to be 9500 newtons. The results indicated that the maximum tensile and compressive stress is 25.25 Mpa, occurring near the small end of the connecting rod, and the overall elongation due to tensile stress was calculated to be 0.018 millimeters. Additionally, the allowable number of cycles was determined to be 10^8, and the minimum safety factor was established at 3.7.

کلیدواژه‌ها English

Connecting Rod
Finite Element
Static Analysis
Fatigue
Buckling
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  • تاریخ دریافت 20 آبان 1403
  • تاریخ بازنگری 15 آذر 1403
  • تاریخ پذیرش 30 آذر 1403