The focus of the paper is the analysis of mistuning, which are small deviations of the blade properties, e.g., due to manufacturing tolerances. The resonant amplitudes of turbine blades are very sensitive to these deviations which can lead to significantly increased vibratory response of some blades with the increased risk of high cycle fatigue. The main part of the paper discusses about the methods that can be used to find blade patterns which are insensitive to energy localization. The sensitivity of the forced response against harmonic mistuning, which is a harmonic alignment of the blades respective to the mistuning factors of the single blades, is examined. A previously developed reduced order model (ROM) is used to efficiently conduct Monte Carlo simulations (MCSs). Especially the influence of the variance of the harmonically mistuned blade patterns is discussed. On the basis of this analysis, rules are developed to suppress the energy localization. The rules are mainly focused on the alignment of the blades around the bladed disk. The approach also takes advantage of the special properties of harmonic mistuning patterns. An assignment of the blades to insensitive harmonic mistuning patterns with a specific variance and number of periods is used to reduce the maximum of the amplification factor of the forced response. A similar approach uses intentional mistuning patterns with different blade types which are aligned harmonically and are insensitive to an additional stochastic mistuning. In case of specific combinations of the dependent parameters, especially the variance of the mistuning factors and the number of periods, the energy localization can be reduced considerably.
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September 2016
Research-Article
A Method to Reduce the Energy Localization in Mistuned Bladed Disks by Application-Specific Blade Pattern Arrangement
Andreas Hohl,
Andreas Hohl
Institute for Dynamics and Vibration Research,
Gottfried Wilhelm Leibniz Universität Hannover,
Hannover 30167, Germany
e-mail: [email protected]
Gottfried Wilhelm Leibniz Universität Hannover,
Hannover 30167, Germany
e-mail: [email protected]
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Jörg Wallaschek
Jörg Wallaschek
Institute for Dynamics and Vibration Research,
Gottfried Wilhelm Leibniz Universität Hannover,
Hannover 30167, Germany
Gottfried Wilhelm Leibniz Universität Hannover,
Hannover 30167, Germany
Search for other works by this author on:
Andreas Hohl
Institute for Dynamics and Vibration Research,
Gottfried Wilhelm Leibniz Universität Hannover,
Hannover 30167, Germany
e-mail: [email protected]
Gottfried Wilhelm Leibniz Universität Hannover,
Hannover 30167, Germany
e-mail: [email protected]
Jörg Wallaschek
Institute for Dynamics and Vibration Research,
Gottfried Wilhelm Leibniz Universität Hannover,
Hannover 30167, Germany
Gottfried Wilhelm Leibniz Universität Hannover,
Hannover 30167, Germany
1Corresponding author.
2Present address: Baker Hughes Drilling Services, Celle 29221, Germany.
Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received November 27, 2015; final manuscript received January 15, 2016; published online March 22, 2016. Editor: David Wisler.
J. Eng. Gas Turbines Power. Sep 2016, 138(9): 092502 (10 pages)
Published Online: March 22, 2016
Article history
Received:
November 27, 2015
Revised:
January 15, 2016
Citation
Hohl, A., and Wallaschek, J. (March 22, 2016). "A Method to Reduce the Energy Localization in Mistuned Bladed Disks by Application-Specific Blade Pattern Arrangement." ASME. J. Eng. Gas Turbines Power. September 2016; 138(9): 092502. https://doi.org/10.1115/1.4032739
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