Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Control and optimization of pipes conveying fluid
KTH, Superseded Departments, Aeronautical Engineering.
1998 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH , 1998. , 21 p.
Series
Report. Department of Aeronautics, 98:1
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-784OAI: oai:DiVA.org:kth-784DiVA: diva2:14763
Presentation
(English)
Note
QC 20100429Available from: 2000-09-26 Created: 2000-09-26 Last updated: 2010-04-29Bibliographically approved
List of papers
1. Active nozzle control and integrated design optimization of a beam subject to fluid-dynamic forces.
Open this publication in new window or tab >>Active nozzle control and integrated design optimization of a beam subject to fluid-dynamic forces.
1999 (English)In: Journal of Fluids and Structures, ISSN 0889-9746, E-ISSN 1095-8622, Vol. 13, no 2, 269-287 p.Article in journal (Refereed) 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.

National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-12426 (URN)10.1006/jfls.1998.0196 (DOI)000079725500006 ()
Note
QC 20100421Available from: 2010-04-21 Created: 2010-04-21 Last updated: 2017-12-12Bibliographically approved
2. On the optimal design of pipes conveying fluid.
Open this publication in new window or tab >>On the optimal design of pipes conveying fluid.
1998 (English)In: Journal of Fluids and Structures, ISSN 0889-9746, E-ISSN 1095-8622, Vol. 12, no 3, 353-365 p.Article in journal (Refereed) 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.

Identifiers
urn:nbn:se:kth:diva-12425 (URN)10.1006/jfls.1997.0135 (DOI)
Note
QC 20100421Available from: 2010-04-21 Created: 2010-04-21 Last updated: 2017-12-12Bibliographically approved

Open Access in DiVA

No full text

Search in DiVA

By author/editor
Borglund, Dan
By organisation
Aeronautical Engineering
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 120 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf