Investigating the performance of SPSA in simulation-optimization approaches to transportation problems

While optimization models play a key role in transportation analysis, the objective function to be optimized, however, cannot be defined analytically. It is therefore necessary to resort to non-differentiable optimization methods that usually pivot on evaluating the objective function. Special cases...

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Bibliographic Details
Main Authors: Ros-Roca, Xavier, Montero Mercadé, Lídia, Schneck, Arne, Barceló Bugeda, Jaime
Format: Publication
Language:English
Published: Elsevier 01.01.2018
Subjects:
15 Linear and multilinear algebra; matrix theory
93 Systems Theory; Control
93C Control systems, guided systems
Classificació AMS
dynamic OD matrix estimation
Dynamic User Equilibrium
Investigació operativa
Matemàtiques i estadística
Matrices
Matrius (Àlgebra)
Optimització
sensitivity analysis
SPSA
System theory
Àlgebra
Àrees temàtiques de la UPC
ISSN:2352-1457
Online Access:Get full text
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Description
Summary:While optimization models play a key role in transportation analysis, the objective function to be optimized, however, cannot be defined analytically. It is therefore necessary to resort to non-differentiable optimization methods that usually pivot on evaluating the objective function. Special cases of particular interest are those in Dynamic OD Estimation, which cannot evaluate the objective function analytically and thus the formulation falls in the computational framework of Simulation-Optimization. SPSA is not limited to the inputs from conventional traffic counts and can be easily extended to account for the measurements of traffic variables supplied by emerging sensors exploiting Information and Communication Technologies (ICT). Numerical experiments have been conducted, and the results have been analyzed from two different perspectives: performance and solution quality. This allows understanding the behavior of the SPSA algorithm and new variants, which altogether contribute to the aim of adding ICT measures in the future. Their sensitivity to the initial values, the effect of bounding the variables and scaling techniques are analyzed. This paper will report on the results of the numerical experiments, their analyses, conclusions and further research. Peer Reviewed
ISSN:2352-1457
DOI:10.1016/j.trpro.2018.11.017