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Control and optimization of pipes conveying fluid
KTH, Tidigare Institutioner                               , Flygteknik.
1998 (engelsk)Licentiatavhandling, med artikler (Annet vitenskapelig)
sted, utgiver, år, opplag, sider
Stockholm: KTH , 1998. , s. 21
Serie
Report. Department of Aeronautics ; 98:1
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-784OAI: oai:DiVA.org:kth-784DiVA, id: diva2:14763
Presentation
(engelsk)
Merknad
QC 20100429Tilgjengelig fra: 2000-09-26 Laget: 2000-09-26 Sist oppdatert: 2010-04-29bibliografisk kontrollert
Delarbeid
1. Active nozzle control and integrated design optimization of a beam subject to fluid-dynamic forces.
Åpne denne publikasjonen i ny fane eller vindu >>Active nozzle control and integrated design optimization of a beam subject to fluid-dynamic forces.
1999 (engelsk)Inngår i: Journal of Fluids and Structures, ISSN 0889-9746, E-ISSN 1095-8622, Vol. 13, nr 2, s. 269-287Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Active nozzle control is used to improve the stability of a beam subject to forces induced by fluid flow through attached pipes. The control system has a significant effect on the structural stability, making both flutter and divergence type of instabilities possible. The stability analysis is carried out using a state-variable approach based on a finite element formulation of the structural dynamics. The simultaneous design of the control system and the beam shape minimizing structural mass is performed using numerical optimization. The inclusion of the control system in the optimization gives a considerable reduction of the structural mass but results in an optimal design which is very sensitive to imperfections. Using a simple model of the control system uncertainties, a more robust design is obtained by solving a modified optimization problem. Throughout the study, the theoretical findings are verified by experiments.

HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-12426 (URN)10.1006/jfls.1998.0196 (DOI)000079725500006 ()2-s2.0-0002406616 (Scopus ID)
Merknad
QC 20100421Tilgjengelig fra: 2010-04-21 Laget: 2010-04-21 Sist oppdatert: 2020-03-10bibliografisk kontrollert
2. On the optimal design of pipes conveying fluid.
Åpne denne publikasjonen i ny fane eller vindu >>On the optimal design of pipes conveying fluid.
1998 (engelsk)Inngår i: Journal of Fluids and Structures, ISSN 0889-9746, E-ISSN 1095-8622, Vol. 12, nr 3, s. 353-365Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The stability and optimal design of a beam subject to forces induced by fluid flow through attached pipes is investigated. The structure is assumed to have the same dynamics as a fluid-conveying pipe, and the dynamic stability is analysed using a finite element formulation of the linear equation of motion. The optimal design problem of minimizing the structural mass at fixed critical flow speed is solved. The numerical results are compared to experiments with satisfactory agreement, provided that the lower bounds of the beam dimensions are properly chosen. The influence of structural damping on the critical flow speed is significant, and is found to be strongly design-dependent.

Identifikatorer
urn:nbn:se:kth:diva-12425 (URN)10.1006/jfls.1997.0135 (DOI)2-s2.0-0000814737 (Scopus ID)
Merknad
QC 20100421Tilgjengelig fra: 2010-04-21 Laget: 2010-04-21 Sist oppdatert: 2020-03-10bibliografisk kontrollert

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