Approximate and Simplified Models

Papadourakis, Antonis; Rijnsdorp, J.E.

doi:10.1007/978-1-4757-0277-4_4

Cited by 1 publication

(2 citation statements)

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“…Recycling systems enable the matter and energy to be recovered in an industrial process. For instance, a typical plant configuration is formed by a reactor/separator process, where reactants are recycled back to the reactor [1], [2], [3].…”

Section: Introductionmentioning

confidence: 99%

“…Model approximation has been proposed to remove the exponential terms from the transfer function denominator of a delayed system, such as the method of moments [12], and Pade-Taylor approximations [13], [14], [15]. Other techniques, such as the seasonal time-series model [11], have been proposed to obtain an approximate model to represent recycle systems.…”

Section: Introductionmentioning

confidence: 99%

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Observer scheme for linear recycling systems with time delays

Rubio

Cuellar

Velasco-Villa

et al. 2011

Proceedings of the 2011 American Control Conference

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In this paper a new control methodology is proposed for unstable linear time-delay systems with recycle. For this kind of systems time delays are present in the forward and backward paths increasing control difficulty. The strategy is based on the observation that if some internal system signals were known then it would be possible to remove the backward dynamics. In this way, a controller feedback could be designed by considering only the dynamics of the forward loop. To carry out this strategy an asymptotic observer is proposed to estimate the internal signals needed. Necessary and sufficient conditions to assure convergence of the proposed observerpredictor are given. An overall procedure for the proposed methodology is provided and numerical simulations to illustrate its performance are presented.

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Section: Introductionmentioning

confidence: 99%