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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 2    April 2002

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Identification of ARMAX based on
genetic algorithm
HE Shang-hong(贺尚红)1,2, LI Xu-yu(李旭宇)2, ZHONG Jue(钟  掘)2

1.Department of Mechanical and Electronic Engineering,
Changsha Communications University, Changsha 410076, China;
2.College of Mechanical and Electronic Engineering,
Central South University, Changsha 410083, China

Abstract:On the basis of genetic algorithm, an intelligent search approach to determination of parameters of ARMAX(Autor Regressive Moving Average model with external in put) processes was proposed. By representing the system wit h pole and zero pairs and repairing illegal chromosomes, the search space is limited to stable schemes. In calculation of objective function the “shifted data window” was designed, so that every inputoutput pair is used to guide the evolution and the “Data Saturation” is avoided. To prevent premature convergence, the adaptive fitness function was introduced, the conventional crossover and mutation operator was modified and the “catastrophic mutation” which is based on Metropolis mechanism was adopted. So the performance of convergence to the global optimum is improved. The validity and efficiency of proposed algorithm were illustrated by simulated results.

 

Key words: system identification; genetic algorithm; ARMAX process; optimum

ISSN 1672-7029
CN 43-1423/U

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