Journal of the Korea Institute of Information and Communication Engineering (한국정보통신학회논문지)

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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Identification of Linear Model of Tandem Cold Mill Using N4SID Algorithm

N4SID 알고리즘을 이용한 연속 냉간 압연기의 선형모델 규명

  • 엄상오 (양산대학 환경안전과) ;
  • 황이철 (동의대 기계 산업시스템공학부) ;
  • 김윤식 (한국해양대학교 전기시스템공학과) ;
  • 김종윤 (한국해양대학교 기관공학과) ;
  • 박영산 (한국해양대학교 기관공학과)
  • Published : 1999.12.01
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Abstract

This paper identifies a linear time-invariant mathematical model of each stand of a five-stand tandem cold mill to design a robust $H_\infty$ thickness controller by applying input and output data sets to N4SID (Numerical algorithms for Subspace State Space System Identification) method. The input-output data sets describe interstand interference in the process of tandem cold rolling and are obtained from a nonlinear simulator of the tandem cold mill. In result, it is shown that the identified model well approximates the nonlinear model than a Taylor linearized model. Furthermore, uncertainties including roll eccentricity and incoming strip variation are quantitatively analyzed from the plot of maximum singular values.

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