مطالعه‌ای بر عملکرد بالستیکی ساختارهای تک‌لایه و چندلایه فلزی تحت ضربه پرتابه کروی صلب: بررسی تجربی و مدل‌سازی

نوع مقاله : مقاله مستقل

نویسندگان

1 دانشجوی کارشناسی ارشد، دانشکده مهندسی مکانیک، دانشگاه ایوان‌کی، ایوان‌کی، ایران

2 استادیار، دانشکده مهندسی مکانیک، دانشگاه ایوان‌کی، ایوان‌کی، ایران

3 دانشیار، دانشکده مهندسی مکانیک، دانشگاه گیلان، رشت، ایران

10.22044/jsfm.2020.9302.3101

چکیده

در مقاله حاضر، به بررسی تجربی و مدل‌سازی تغییر شکل پلاستیک ورق‌های تک‌لایه و چندلایه فلزی آلومینیومی، فولادی و یا ترکیبی از فولاد و آلومینیوم تحت ضربه پرتابه کروی صلب پرداخته‌شده است. برای انجام آزمون‌های تجربی، هشت نوع لایه‌بندی مختلف در نظر گرفته شد و نمونه‌ها در محدوده سرعت 42 تا 158 متر بر ثانیه تحت ضربه پرتابه قرار گرفتند. همچنین، مدل‌سازی این فرآیند با استفاده از سیستم استنتاج فازی-عصبی تطبیقی با بکار بردن الگوریتم ژنتیک در طراحی بهینه چند هدفی با تقسیم داده‌ها به دو بخش داده‌های آموزش و پیش‌بینی به‌کار برده شد. به منظور ارتقا عملکرد سیستم عصبی- فازی، از الگوریتم ژنتیک در طراحی بهینه پارامترهای توابع عضویت گوسی در بخش ورودی و روش تجزیه مقادیر ویژه برای محاسبه بردار ضرایب خطی در بخش نتایج استفاده شد. روند طراحی بهینه و مدل‌سازی با در نظر گرفتن تعداد 3 تابع عضویت برای هریک از 3 داده آزمایشگاهی ورودی انجام شد. سنجش دقت مدل پیشنهادی با استفاده از ضریب تعیین و میانگین مجذور مربعات خطای داده‌های آموزشی و پیش‌بینی مورد ارزیابی قرارگرفت.

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