مدل طراحی شبکه حمل‌ونقل ترکیبی تحت شرایط عدم قطعیت (موردمطالعه: حمل‌ونقل سیمان در کشور ایران)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، دانشگاه علم و صنعت ایران.

2 دانشیار، دانشگاه علم و صنعت ایران.

چکیده

امروزه با جهانی‌شدن زنجیره‌های تأمین، استفاده از سیستم‌های حمل‌ونقل کارآمد برای توزیع کالاها می‌تواند تأثیر زیادی بر کاهش هزینه‌های لجستیکی و افزایش رضایت­مندی مشتریان بگذارد. در این راستا مراکز لجستیک بار علاوه بر اینکه زیرساخت‌های موردنیاز برای انتقال جریان بار از جاده به شبکه ریلی را فراهم می‌کنند، نقش بسزایی در کاهش هزینه‌های کل حمل‌ونقل با استفاده از اقتصاد در مقیاس و ایجاد ارزش‌افزوده برای کالاهای خام دارند. ازاین‌رو در این پژوهش با توجه به عدم قطعیت موجود در تقاضاها و هزینه های حمل‌ونقل، یک مدل ریاضی استوار برای طراحی شبکه حمل‌ونقل ترکیبی بار با استفاده از دو روش حمل‌ونقل ریل و جاده در سطح ملّی ارائه شده است. در مدل احتمالی مبتنی بر سناریوی ارائه‌شده، دو هدف موردتوجه قرار گرفته است؛ هدف نخست بر حداقل­کردن هزینه‌ها و هدف دوم از دیدگاه کاهش ریسک تصمیم‌گیری بر حداقل­کردن حداکثر تأسف سناریوهای محتمل در چارچوب برنامه‌ریزی استوار متمرکز است. در ادامه، برای نمایش اعتبار مدل ارائه شده و کارایی آن، حمل‌ونقل ترکیبی سیمان در ایران مورد بررسی قرار گرفته است. خروجی‌ها نشان می‌دهد که توسعه تعدادی از ایستگاه‌های راه‌آهن در کشور و انتقال حجم قابل‌توجهی از سیمان حمل­شده از جاده به شبکه ریلی، موجب کاهش قیمت این محصول استراتژیک می‌شود.

کلیدواژه‌ها


عنوان مقاله [English]

Multimodal Transportation Network Design Model under Uncertainty Conditions (Case Study: Cement Transportation in Iran)

نویسندگان [English]

  • Minoo Farazmand 1
  • Mir Saman Pishvaee 2
1 M.Sc. Student, Iran University of Science & Technology.
2 Associate Professor, Iran University of Science & Technology.
چکیده [English]

Today, with supply chain globalization, the use of efficient transportation systems to distribute goods have a significant impact on reducing logistics costs and increasing customer satisfaction. In this regard, logistics centers in addition to providing the necessary infrastructure for the flow of freight from the road to the rail network, play a significant role in Reduce total transportation costs and create surplus value for raw materials; Therefore, in this research, due to uncertainties in demand and transportation costs, a robust mathematical model is presented for designing a multimodal rail - road freight transportation network at the national level. In the scenario-based stochastic model, two objectives have been considered. The first objectives focuses on minimizing costs, and the second objective focuses on reducing risk-taking decisions to minimize the maximum relative regret of possible scenarios within the framework of robust mathematical programming. In order to demonstrate the validity of the model and its efficiency, the cement multimodal transportation in Iran has been investigated. Outputs show that the development of a number of railway stations and transfer of a significant amount of Cement shipped by road to the rail network will reduce the price of this strategic product.

کلیدواژه‌ها [English]

  • Multimodal Transportation Network Design
  • Multimodal Terminals Location
  • Scenario-Based Two-Stage Stochastic Programming
  • Minimizing Maximum Relative Regret
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