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Modelling and analysis of a high-speed turbine impeller concerning mistuning

  • As-manufactured impellers behave significantly different from nominal impellers. There are no identical blades due to geometric and material deviations. In this paper three model updating procedures are discussed with the objective to achieve realistic models of as-manufactured impellers. The techniques are applied to radial inflow turbine wheel of an exhaust gas turbocharger. The first approach creates a model through optical measurement and mesh morphing. The second approach is based on a contactless measurement of blade individual vibration responses. An iterative update process gains the corresponding mistuning pattern and thus the associated model. Third, a model is found by an optimisation, that identified a mistuning pattern, that fits modal characteristics, which are evaluated during experimental modal analysis at vacuum. In-depth analyses of these models are realised to determine advantages and drawbacks of the procedures.

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Metadaten
Author: Robby Weber, Arnold Kühhorn, Christoph Rocky Heinrich
DOI:https://doi.org/10.1051/matecconf/201821118002
Title of the source (English):The 14th International Conference of machinery (VETOMAC XIV), Lissabon, 10-13 September 2018
Document Type:Conference publication peer-reviewed
Language:English
Year of publication:2018
Number of pages:6
Series ; volume number:MATEC Web of Conferences ; 211
Article number:18002
Faculty/Chair:Fakultät 3 Maschinenbau, Elektro- und Energiesysteme / FG Strukturmechanik und Fahrzeugschwingungen
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