## Abstract

We introduce a novel, node flow based mathematical model

for the fixed-time version of a central problem in the liner shipping industry called the Liner Shipping Fleet Repositioning Problem (LSFRP). We call this version of the problem the Inflexible Visitation LSFRP (IVLSFRP).

During repositioning, vessels are moved between routes in a liner

shipping network. Shipping lines wish to reposition vessels as cheaply as possible without disrupting the cargo flows of the network. The LSFRP is characterized by chains of interacting activities with a multi-commodity flow over paths defined by the activities chosen. We introduce two versions of a node flow based model that exploit the fixed activity times

of the IVLSFRP’s graph to handle cargo demands on the nodes of the graph, instead of the arcs, significantly reducing the number of variables.

Using this model in CPLEX, we are able to solve 12 previously unsolved IVLSFRP instances to optimality. Additionally, we improve the solution time on every instance in the IVLSFRP dataset, sometimes by several orders of magnitude.

for the fixed-time version of a central problem in the liner shipping industry called the Liner Shipping Fleet Repositioning Problem (LSFRP). We call this version of the problem the Inflexible Visitation LSFRP (IVLSFRP).

During repositioning, vessels are moved between routes in a liner

shipping network. Shipping lines wish to reposition vessels as cheaply as possible without disrupting the cargo flows of the network. The LSFRP is characterized by chains of interacting activities with a multi-commodity flow over paths defined by the activities chosen. We introduce two versions of a node flow based model that exploit the fixed activity times

of the IVLSFRP’s graph to handle cargo demands on the nodes of the graph, instead of the arcs, significantly reducing the number of variables.

Using this model in CPLEX, we are able to solve 12 previously unsolved IVLSFRP instances to optimality. Additionally, we improve the solution time on every instance in the IVLSFRP dataset, sometimes by several orders of magnitude.

Originalsprog | Engelsk |
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Bogserie | Lecture Notes in Computer Science |

Vol/bind | 8197 |

Sider (fra-til) | 18-34 |

Antal sider | 17 |

ISSN | 0302-9743 |

DOI | |

Status | Udgivet - 2013 |

Begivenhed | 4th International Conference on Computational Logistics - Copenhagen, Danmark Varighed: 25 sep. 2013 → 27 sep. 2013 http://iwi.econ.uni-hamburg.de/iccl2013/ |

### Konference

Konference | 4th International Conference on Computational Logistics |
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Land/Område | Danmark |

By | Copenhagen |

Periode | 25/09/2013 → 27/09/2013 |

Internetadresse |