Fatigue Analysis and Optimization of Crankshaft of V8 Diesel Engine

Document Type : Persian

Authors

1 Malekashtar University

2 MalekAshtar University

Abstract

The crankshaft is one of the most critically loaded components as it experiences cyclic loads in the form of bending and torsion during its service life. Its failure will cause serious damage to the engine so it’s important at the time of design to verify fatigue strength. More challenges in crankshaft design due to increasing vehicle payloads, lower weight requirement, higher efficiency and longer durability life. In this study a dynamic simulation was conducted on a crankshaft from a V8 diesel four stroke engine. Finite element analysis was performed to obtain and analysis the variation of the stress magnitude at every location of crankshaft especially at critical points. Results obtained from the aforementioned analysis were then used in optimization of the crankshaft. Also accumulated fatigue damage caused by the change in loading in different crankshaft speeds was determined. The goal of this study is designing crankshaft with suitable and optimum dimensions which can serve the longer durability life without any failures.

Keywords

Full Text

میل‌لنگ یکی از قسمت‌های موتور احتراق داخلی است که در طول عمر کاری خود تحت بار خمشی و پیچشی متناوب قرار می‌گیرد. شکست در میل‌لنگ باعث ایجاد خسارت جدی به موتور می‌شود، از این رو در زمان طراحی مهم است که استحکام خستگی آن بررسی شود. برای طراحی میل‌لنگ چالش‌های بسیاری از جمله بار مفید خودرو، وزن بهینه، بازده بیشتر و عمر دوام بیشتر مدنظر است. در این مقاله میل‌لنگ موتور دیزل هشت سیلندر خورجینی چهار زمانه به صورت دینامیکی شبیه‌سازی می‌شود و توزیع و تغییرات تنش در نقاط مختلف میل‌لنگ و به ویژه در نقاط بحرانی آن، با روش اجزاء محدود تحلیل می‌گردد. از نتایج به دست آمده از تحلیل برای بهینه‌سازی میل‌لنگ استفاده می‌شود. همچنین آسیب انباشته‌ی خستگی ناشی از تغییر در بارگذاری وارد بر میل‌لنگ در دورهای مختلف کارکرد آن بررسی می‌گردد. هدف این مقاله طراحی میل‌لنگی با ابعاد مناسب و بهینه است به گونه‌ای که عمر دوام آن بیشتر و بدون هیچ شکستی حفظ شود.

References

[1]                 Jian M., Yong-qi L., Rui-xiang L., Bin Z., 3-D Finite Element Analysis on 480 diesel crankshaft, Information Engineering and Computer Science (ICIECS), 25-26 December 2010, Wuhan, China.
[2]                 Yingkui G., Zhibo Z., Strength Analysis of Diesel Engine Crankshaft Based on PRO/E and ANSYS, Third International Conference on Measuring Technology and Mechatronics Automation, 6-7 January 2011, Shanghai, China.
[3]                 Varun B., Stress Analysis and Optimization of Crankshafts Subject to Static Loading, International Journal Of Engineering And Computer Science, vol. 3, 2014, pp. 5579-5587.
[4]                 Montazersadgh F. H., Fatemi A., Stress Analysis and Optimization of Crankshafts Subject to Dynamic Loading, American Iron and Steel Institute (AISI), The University of Toledo, 2007.
[5]                 Pandiyan K., Ashesh Tiwari, Crankshaft Design Methodology for Diesel Engines, International Journal of Innovative Research in Science, Engineering and Technology, vol. 4, 2015.
[6]                 Pulkrabek W., Engineering Fundamentals of the Internal Combustion Engine, University of Michigan, 2004.
[7]                 Verifying the average emission of pollutants in a congested urban area after a cold start (70/220/EEC), Appendix 1 of Annex III, Official Journal of the European Communities, 1970.
[8]                 Boardman B., Fatigue resistance of steels, Metals Handbook, ASM Handbook Committee, ASM International, 1990, 673-688.
[9]                 Stephens R. I, Fatemi A., Stephens R. R., and Fuchs H. O., Metal Fatigue in Engineering, John Wiley & Sons inc, 2000.
[10]             ANSYS Design Exploration Tutorial, November 2009.
Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering
Volume 9, Issue 4 - Serial Number 28
Winter 2017
Pages 619-630

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