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Journal of applied research and technology

versão On-line ISSN 2448-6736versão impressa ISSN 1665-6423

J. appl. res. technol vol.5 no.1 Ciudad de México Abr. 2007


Tracking unmodelled signals of nonlinear systems via robust sliding mode observer: application to reacting systems


R. Aguilar-López1,2 G. Soto-Cortés1, M.I. Nería-González2 & R. Escarela-Pérez1


1Departamento de Energía, Universidad Autónoma Metropolitana-Azcapotzalco, Av. San Pablo No. 180, Reynosa-Tamaulipas, 02200; Azcapotzalco, México, D.F. MEXICO E-mail.- , Fax.- + (52) 5394 7378.

2Departamento de Biotecnología y Bioingeniería. CINVESTAV-IPN.



The problem of the on-line estimation of the reaction heat in a continuous stirred tank reactor from temperature measurements is addressed in this paper. The proposed uncertainty observer is based on differential algebraic techniques, such that the algebraic observability condition of the uncertainty from noisy temperature measurements is easily verified and the observer structure is very simple, which lead to feasible implementation. The observer proposed is robust against noisy measurements and sustained disturbances. The good performance of the observer is shown by means of numerical simulations.

Keywords: uncertainty observer, noisy measurements, sustained disturbances, robustness.





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