TITLE

The Traveling Salesman Problem with Pickups, Deliveries, and Handling Costs

AUTHOR(S)
Battarra, Maria; Erdoğan, Güneş; Laporte, Gilbert; Vigo, Daniele
PUB. DATE
August 2010
SOURCE
Transportation Science;Aug2010, Vol. 44 Issue 3, p383
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
This paper introduces a new variant of the one-to-many-to-one single vehicle pickup and delivery problems (SVPDP) that incorporates the handling cost incurred when rearranging the load at the customer locations. The simultaneous optimization of routing and handling costs is difficult, and the resulting loading patterns are hard to implement in practice. However, this option makes economical sense in contexts where the routing cost dominates the handling cost. We have proposed some simplified policies applicable to such contexts. The first is a two-phase heuristic in which the tour having minimum routing cost is initially determined by optimally solving an SVPDP, and the optimal handling policy is then determined for that tour. In addition, branch-and-cut algorithms based on integer linear programming formulations are proposed, in which routing and handling decisions are simultaneously optimized, but the handling decisions are restricted to three simplified policies. The formulations are strengthened by means of problem specific valid inequalities. The proposed methods have been extensively tested on instances involving up to 25 customers and hundreds of items. Our results show the impact of the handling aspect on the customer sequencing and indicate that the simplified handling policies favorably compare with the optimal one.
ACCESSION #
53833042

 

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