A Finite Element Based Least Square Fit for the Assessment of Integral and Non-Integral Vibrations With Blade Tip Timing

  • This paper aims at improving the robustness and accuracy of the least square fit technique utilized in blade tip timing (BTT) measurements of blade vibrations by proposing two modifications. The first proposal is to replace the lines of the original least square problem by differences of consecutive lines. Thereby, the static deflection as well as the circumferential blade positioning error cancels out and the robustness is improved by removing these uncertainties inherently. The second proposal is to replace the fit of piecewise constant vibration amplitudes within the chosen block length by a linear or cubic spline in the frequency (integral) or time (non-integral) regime. This does not only suppress overshoots due to distorted acceleration or deceleration manoeuvres but also allows for a ”coarser analysis grid” (i.e. larger block length) without loosing amplitude accuracy. Thereby it smooths out random errors more efficiently and increases the orthogonality of the relevant EO or vibration frequency to unwanted signal components.

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Metadaten
Author: Felix Figaschewsky, Arnold Kühhorn, Thomas Giersch
URL:http://isromac-isimet.univ-lille1.fr/index.php?rubrique=abstract17_&num=2
Title of the source (English):Proceedings of ISROMAC 2017, Maui, Hawaii, December 16-21, 2017
Document Type:Conference Proceeding
Language:English
Year of publication:2017
Tag:Blade Tip Timing; Blade Vibration; Non-Intrusive Measurements
Number of pages:9
Faculty/Chair:Fakultät 3 Maschinenbau, Elektro- und Energiesysteme / FG Strukturmechanik und Fahrzeugschwingungen
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