A simheuristic algorithm for the capacitated location routing problem with stochastic demands

Carlos L. Quintero-Araujo, Daniel Guimarans, Àngel A. Juan

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The capacitated location routing problem (CLRP) integrates a facility location problem with a multi-depot vehicle routing problem. We consider the CLRP with stochastic demands, whose specific values are only revealed upon reaching each customer. The main goal is to minimise the expected costs of: (i) opening facilities, (ii) using a fleet of vehicles, (iii) executing a routing plan, and (iv) applying corrective actions. The latter are required whenever a route failure occurs due to unexpected high demands. We propose a simheuristic algorithm hybridizing simulation with an iterated local search metaheuristic, aimed at: (i) proposing a safety-stock policy to diminish the likelihood of route failure; and, (ii) estimating the expected cost and the reliability of each “elite” solution. We assess our approach on classical CLRP benchmarks, which are later extended to consider demand uncertainty. Finally, we also discuss the effects of the safety-stock policy on costs and reliability.
Original languageEnglish
Pages (from-to)1-18
Number of pages18
JournalJournal of Simulation
DOIs
Publication statusPublished - 30 Oct 2019

Keywords

  • Location routing problem
  • stochastic demands
  • simheuristics
  • iterated local search
  • biased randomisation

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