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Evaluation of time varying stresses in a Howden fan
Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
2015 (English)Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

In this work, the time varying stresses in a Howden axial flow fan are obtained by finite element analyses. Dynamic substructuring is used to obtain accurate values of the stresses in the threads of the blade shaft, the component which connects the blade with the hub.

Three different global models are used to compare the influence of neglecting the fan shaft and the stiffness influence of the centrifugal force.

The relative displacements, which are obtained from the global models, have been used as boundary condition in the detailed models. The detailed models are used to obtain the Von Mises stresses in the root of the threads of the blade shaft. Finally the results of the three global models are compared with experimental measured data provided by Howden.

The experimental data results in the highest Von Mises stresses. The model with the fan shaft and the stiffness influence of the centrifugal force gives values for the Von Mises stresses which are approximately twenty percent lower. The model without the fan shaft results in the lowest stresses which are approximately forty percent lower than the stresses obtained using the measured data.

Place, publisher, year, edition, pages
2015. , 50 p.
Keyword [en]
Finite element analyses, Dynamic substructuring, Axial flow fan, Blade, Rotor dynamics, Centrifugal force
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:lnu:diva-43752OAI: oai:DiVA.org:lnu-43752DiVA: diva2:818015
Subject / course
Mechanical Engineering
Educational program
Mechanical Engineering, Master Programme, 60 credits
Supervisors
Examiners
Available from: 2015-06-09 Created: 2015-06-08 Last updated: 2015-06-09Bibliographically approved

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CiteExportLink to record
Permanent link

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