Online-Optimization of Multi-Elevator Transport Systems with Reoptimization Algorithms based on Set-Partitioning Models
Please always quote using this URN: urn:nbn:de:0297-zib-8373
- We develop and experimentally compare policies for the control of a system of $k$ elevators with capacity one in a transport environment with $\ell$ floors, an idealized version of a pallet elevator system in a large distribution center of the Herlitz PBS AG in Falkensee. Each elevator in the idealized system has an individual waiting queue of infinite capacity. On each floor, requests arrive over time in global waiting queues of infinite capacity. The goal is to find a policy that, without any knowledge about future requests, assigns an elevator to each req uest and a schedule to each elevator so that certain expected cost functions (e.g., the average or the maximal flow times) are minimized. We show that a reoptimization policy for minimizing average sq uared waiting times can be implemented to run in real-time ($1\,s$) using dynamic column generation. Moreover, in discrete event simulations with Poisson input it outperforms other commonly used polic ies like multi-server variants of greedy and nearest neighbor.
Author: | Philipp Friese, Jörg Rambau |
---|---|
Document Type: | ZIB-Report |
Tag: | elevator group control; online; policy; real-time; reoptimization; simulation |
MSC-Classification: | 90-XX OPERATIONS RESEARCH, MATHEMATICAL PROGRAMMING / 90Bxx Operations research and management science / 90B06 Transportation, logistics |
Date of first Publication: | 2005/01/05 |
Series (Serial Number): | ZIB-Report (05-03) |
ZIB-Reportnumber: | 05-03 |
Published in: | Appeared in: Discrete Applied Mathematics 154 (2006) 1908-1931 |