Abstract




 
   

IJE TRANSACTIONS A: Basics Vol. 31, No. 7 (July 2018) 1508-1516    Article in Press

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  AUV HULL GEOMETRY OPTIMIZATION USING A MULTI-OBJECTIVE ALGORITHM APPROACH
 
S. Abbasi, M. Zeinali and P. Nejadabbasi
 
( Received: November 11, 2017 – Accepted: February 23, 2018 )
 
 

Abstract    Abstarct In this paper, a new approach to optimize an Autonomous Underwater Vehicle (AUV) hull geometry is presented. Using this methode, the nose and tail of an underwater vehicle are designed, such that their length constraints due to the arrangement of different components in the AUV body are properly addressed. In the current study, an optimal design for the body profile of a torpedo-shaped AUV is conducted, and a multi-objective optimization scheme based on the optimization algorithm NSGA-II (Non-dominated Sorting Genetic Algorithm-II, as an evolutionary algorithm) is employed. In addition, predefined geometrical constraints are considered so that equipment with the specific dimensions can be placed inside the AUV space without any effect on the AUV volume and the wetted surface. By optimizing the parameters of the newly presented profile, in addition to maximizing the volume and minimizing the wetted surface area, more diversed shapes can be achieved than with the ‘Myring’ profile. A CFD analysis of the final optimal design indicates that with the help of the proposed profile, the hydrodynamic parameters for the AUV hull are improved effectively.

 

Keywords    Autonomous underwater vehicles, Hull shape design, multi-objective optimization

 

چکیده    چكيده: در مقاله حاضر یک روش جدید برای بهینه سازی هندسه بدنه یک وسیله زیرسطحی خودکنترل اراائه شده است. به کمک این روش دماغه و دم وسیله زیرسطحی به گونه ای طراحی می شود که قیود طولی ناشی از جانمایی اجزاء متفاوت در داخل بدنه مورد ملاحظه قرار گیرد. در پژوهش حاضر یک طراحی بهینه برای بدنه وسیله زیرسطحی اژدری شکل انجام شده است و روش بهینه سازی چند هدفه بر مبنای الگوریتم بهینه سازیNSGA-II به کار گرفته شده است. همچنین قیود هندسی تعیین شده به گونه ای درنظرگرفته شده اند که قطعات با ابعاد معین را بتوان در داخل بدنه وسیله زیرسطحی نصب کرد بدون آنکه تاثیری در حجم بدنه و یا سطح تر شده وسیله زیرسطحی خودکنترل داشته باشند. با بهینه کردن پارامترهای هندسی پروفیل جدید به کارگرفته شده، علاوه برماکزیمم کردن حجم بدنه می توان به سطح تر شده کمتری دست یافت. ضمن آنکه در مقایسه با پروفیل متداول مایربنگ می توان به تنوعی از شکل های بدنه در یک شرایط هندسی خاص دست یافت. شبیه سازی عددی جریان در طرح بهینه نهایی نشان می دهد که به کمک پروفیل به کارگرفته شده پارامترهای هیدرودینامیکی بدنه زیرسطحی خودکنترل به طور موثری بهبود می یابد.

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