Transfer Function Parameter Identification by Modified Relay Feedback

Summary, in English

This paper proposes a transfer function parameter identification method, applicable to SISO systems of any order. Parameter identification is posed as a (non-convex) squared output error minimization problem, numerically solved utilizing Newton-Raphson iteration with back tracking line search. Focus lies on computing the cost function gradient and Hessian with respect to the parameter vector and on finding a feasible start point. The method is demonstrated for FOTD model identification. A modified relay non-linearity is utilized in order to obtain most input signal energy at a predefined phase, without a priori system information. The identification method is evaluated on a batch of common process industry processes. Finally, conclusions and suggestions on future work are provided.

• Författare: Kristian Soltesz; Tore Hägglund; Karl Johan Åström
• Avdelning/ar: Institutionen för reglerteknik; ELLIIT: the Linköping-Lund initiative on IT and mobile communication
• Publiceringsår: 2010
• Språk: Engelska
• Sidor: 2164-2169
• Publikation/Tidskrift/Serie: 2010 American Control Conference
• Fulltext: - 909 kB; Download statistics
• Länkar: http://dx.doi.org/10.1109/ACC.2010.5531322
• Dokumenttyp: Konferensbidrag
• Ämne: Control Engineering
• Nyckelord: relay; identification; parametric; transfer function; state space; FOTD
• Conference name: American Control Conference, 2010
• Conference date: 2010-06-30 - 2010-07-02
• Conference place: Baltimore, MD, United States
• Status: Published
• Projekt: Automatic Tuning; PICLU
• Forskningsgrupp: LCCC
• ISBN/ISSN/Övrigt: ISSN: 0743-1619; ISBN: 978-1-4244-7426-4