CPL - Chalmers Publication Library
| Utbildning | Forskning | Styrkeområden | Om Chalmers | In English In English Ej inloggad.

Closed loop model reduction applied to a tank reactor process

Veronica Olesen (Institutionen för signaler och system, Reglerteknik) ; Claes Breitholtz (Institutionen för signaler och system, Reglerteknik) ; Torsten Wik (Institutionen för signaler och system, Reglerteknik)
Chemical Engineering Science (0009-2509). Vol. 63 (2008), 3, p. 674-684.
[Artikel, refereegranskad vetenskaplig]

The subject of this article is the direct assessment of model simplification from a feedback control perspective. Normally, dynamic systems are simplified dimensionally and structurally from an open loop perspective. In spite of the intentions, the resulting models still often tend to be unnecessary complex for controller design and synthesis. Here, a four step method is proposed that incorporates a feedback controller, and makes use of the closed loop sensitivity functions to indicate significant impact on the closed loop behaviour from a performed model simplification. The method is applied to a first order reaction in an ideally stirred tank reactor with a cooling system. For this system a general and detailed model is derived. The model includes temperature dependent parameters such as specific heat capacities and densities. This reference model is locally unstable in most operating points, making open loop simplification impractical. The proposed closed loop simplification method makes it possible to evaluate which approximations of the system that can be justified.

Nyckelord: Mathematical modelling; Model reduction; Process control; Chemical reactors; Ideally stirred tank reactor; Sensitivity function


Länken angiven är till In Press versionen



Denna post skapades 2008-01-09. Senast ändrad 2016-07-19.
CPL Pubid: 64984

 

Läs direkt!


Länk till annan sajt (kan kräva inloggning)


Institutioner (Chalmers)

Institutionen för signaler och system, Reglerteknik

Ämnesområden

Kemiteknik
Kemiska processer

Chalmers infrastruktur