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Optimal Parameter Tuning for Multiclass Support Vector Machines in Machinery Health State Estimation
Author(s) -
Kimotho James Kuria,
Sextro Walter
Publication year - 2014
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201410388
Subject(s) - particle swarm optimization , support vector machine , reliability (semiconductor) , computer science , differential evolution , limit (mathematics) , mathematical optimization , data mining , machine learning , artificial intelligence , mathematics , power (physics) , mathematical analysis , physics , quantum mechanics
The increasing demand for high reliability, safety and availability of technical systems calls for innovative maintenance strategies. The use of prognostic health management (PHM) approach where maintenance action is taken based on current and future health state of a component or system is rapidly gaining popularity in the maintenance industry. Multiclass support vector machines (MC‐SVM) has been identified as a promising algorithm in PHM applications due to its high classification accuracy. However, it requires parameter tuning for each application, with the objective of minimizing the classification error. This is a single objective optimization problem which requires the use of optimization algorithms that are capable of exhaustively searching for the global optimum parameters. This work proposes the use of hybrid differential evolution (DE) and particle swarm optimization (PSO) in optimally tuning the MC‐SVM parameters. DE identifies the search limit of the parameters while PSO finds the global optimum within the search limit. The feasibility of the approach is verified using bearing run‐to‐failure data and the results show that the proposed method significantly increases health state classification accuracy. (© 2014 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)