Abstract




 
   

IJE TRANSACTIONS A: Basics Vol. 28, No. 4 (April 2015) 583-592   

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  MULTI-OBJECTIVE OPTIMIZATION OF HYBRID CARBON/GLASS FIBER REINFORCED EPOXY COMPOSITE AUTOMOTIVE DRIVE SHAFT
 
A. Khalkhali, E. Nikghalb and M. Norouzian
 
( Received: July 02, 2014 – Accepted: January 29, 2015 )
 
 

Abstract    In design and fabricate drive shafts with high value of fundamental natural frequency that represented high value of critical speed; using composite materials instead of typical metallic materials could provide longer length shafts with lighter weight. In this paper, multi-objective optimization (MOP) of a composite drive shaft is performed considering three conflicting objectives: fundamental natural frequency, critical buckling torque and weight of the shaft. Fiber orientation angle, ply thickness and stacking sequence are also considered as the design variables in this MOP. To solve this MOP, Modified Non-Dominated Sorting Genetic Algorithm (modified NSGA II) is employed. To calculate fundamental natural frequency and critical buckling torque, finite element model of a truck composite drive shaft has been carried out using commercial software ABAQUS/Standard. Finally optimum design points are obtained and from all non-dominated optimum design points, some trade-off points are picked using multi-criteria decision analysis methods and the points are discussed.

 

Keywords    Drive shaft, Composite tube, Multi-objective optimization, Finite element method, Modified NSGA II algorithm

 

چکیده    استفاده از مواد کامپوزیتی در طراحی و ساخت محورهای محرک سبب افزایش فرکانس طبیعی اولیه محور محرک و در نتیجه افزایش سرعت بحرانی آن شده و در مقایسه با مدل­های فلزی، محورهایی با طول بزرگتر و وزن کمتر ارائه می­کند. در این مقاله، بهینه­سازی چندهدفی یک محور محرک کامپوزیتی با در نظر گرفتن سه هدف ناسازگار مورد توجه قرار گرفت: فرکانس طبیعی اولیه، گشتاور کمانش بحرانی و وزن محور. زاویه جهت­گیری فیبرها، ضخامت هر لایه و ترتیب لایه­چینی، به عنوان متغیرهای طراحی در مسئله بهینه­سازی در نظر گرفته شدند. روش NSGA-II در فرآیند بهینه­سازی چند هدفی به کار گرفته شد. برای محاسیه فرکانس طبیعی اولیه و گشتاور کمانش بحرانی، مدل المان محدود محور محرک یک خودروی باری در نرم­افزار ABAQUS/Standard مورد استفاده قرار گرفته است. در نهایت نقاط طراحی بهینه استخراج شدند و از میان این نقاط طراحی غیر برتر، بعضی نقاط مصالحه شده به کمک روش­ تصمیم­گیری چند معیاری TOPSIS انتخاب شده و مورد بحث قرار گرفته­اند.

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