مدل‌سازی ریاضی دو‌سطحی با تولید‌کنندگان مختلف و وسایل حمل‌و‌نقل چندگانه در زنجیره تأمین

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار، دانشگاه شهید بهشتی.

2 دانشجوی دکتری، دانشگاه آزاد تهران جنوب.

چکیده

امروزه در صنایع بازارهای جهانی نمی‌توان بدون توجه به رقبا حرکت و پیشرفت کرد؛ زیرا همه آن‌ها بخشی از یک زنجیره تأمین هستند و موفقیت یا شکست هر عضو از این زنجیره بر سایر اعضای زنجیره تأثیرگذار است؛ بنابراین در این پژوهش، مسئله زنجیره تأمین دوسطحی با چندین محصول و یک تولیدکننده و همچنین یک توزیع­کننده و چندین مشتری بررسی شد. در قسمت اول زنجیره از یک نوع وسیله نقلیه و در قسمت دوم زنجیره از دو نوع وسیله نقلیه استفاده می‌شود. مدل ریاضی پیشنهادی برای این پژوهش، یک مدل ریاضی یکپارچه برنامه­ریزی مختلط از نوع عدد صحیح است. در این مدل کمینه‌کردن هزینه­ها موردتوجه قرار گرفته است که این هزینه‌ها شامل هزینه حمل‌ونقل، هزینه نگهداری موجودی و هزینه جریمه کمبود است. مورد مطالعه در پژوهش حاضر، ارسال رول‌های تولیدشده از «شرکت فولاد مبارکه اصفهان» به «شرکت سازه‌گستر سایپا (S.G.S)» و از آنجا به «قطعه‌سازان خودرو» است. این مسئله با روش الگوریتم فراابتکاری رقابت استعماری در 20 سایز مختلف حل و نتایج آن در اندازه کوچک بانرم‌افزار GAMSمقایسه شد.

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