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An exact method for the double TSP with multiple stacks
Author(s) -
Lusby Richard M.,
Larsen Jesper,
Ehrgott Matthias,
Ryan David
Publication year - 2010
Publication title -
international transactions in operational research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.032
H-Index - 52
eISSN - 1475-3995
pISSN - 0969-6016
DOI - 10.1111/j.1475-3995.2009.00748.x
Subject(s) - pallet , pickup , travelling salesman problem , computer science , container (type theory) , mathematical optimization , set (abstract data type) , matching (statistics) , mathematics , artificial intelligence , engineering , mechanical engineering , statistics , image (mathematics) , programming language
The double travelling salesman problem (TSP) with multiple stacks (DTSPMS) is a pickup and delivery problem in which all pickups must be completed before any deliveries can be made. The problem originates from a real‐life application where a 40‐foot container (configured as 11 rows of three columns) is used to transport 33 pallets from a set of pickup customers to a set of delivery customers. The pickups and deliveries are performed in two separate trips, where each trip starts and ends at a depot and visits a number of customers. The aim of the problem is to produce a packing plan for the pallets that minimizes the total transportation cost given that the container cannot be repacked at any stage. In this paper we present an exact solution method based on matching k ‐best tours to each of the separate pickup and delivery TSPs. The approach is shown to outperform the only known previous exact method for this problem in that solutions can be obtained faster and previously unsolved instances containing as many as 18 customers can now be solved to optimality.