Discussion Papers, Department of Finance and Management Science, Norwegian School of Economics (NHH)
No 2007/14:
A hybrid method based on linear programming and tabu search for routing of logging trucks
Patrik Flisberg ()
, Bertil Lidén ()
and Mikael Rönnqvist ()
Abstract: In this paper, we consider an operational routing problem
to decide the daily routes of logging trucks in forestry. The industrial
problem is difficult and includes aspects such as pickup and delivery with
split pickups, multiple products, time windows, several time periods,
multiple depots, driver changes and a heterogeneous truck fleet. In
addition, the problem size is large and the solution time limited. We
describe a two-phase solution approach which transforms the problem into a
vehicle routing problem with time windows. In the first phase, we solve an
LP problem in order to find a destination of flow from supply points to
demand points. Based on this solution, we create transport nodes each of
which defines the origin(s) and destination for a full truckload. In phase
two, we make use of a standard tabu search method to combine these
transport nodes, which can be considered to be customers in vehicle routing
problems, into actual routes. The standard tabu search method is extended
to consider some new features. The solution approach is implemented as part
of a newly developed decision support system and we report on tests made on
a set of industrial cases from major forest companies in Sweden.
Keywords: Forestry; Routing; Tabu search; Linear Programming; OR in Practice; (follow links to similar papers)
JEL-Codes: C44; C60; Q23; (follow links to similar papers)
33 pages, March 27, 2007
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