Turbine wheel reduced modal model for self-excited vibration suppression by inter-blade dry-friction damping

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F23%3A00580638" target="_blank" >RIV/61388998:_____/23:00580638 - isvavai.cz</a>
Result on the web
<a href="https://journals.pan.pl/dlibra/publication/148250/edition/129597/content" target="_blank" >https://journals.pan.pl/dlibra/publication/148250/edition/129597/content</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.24425/bpasts.2023.148250" target="_blank" >10.24425/bpasts.2023.148250</a>

Result language
angličtina
Original language name
Turbine wheel reduced modal model for self-excited vibration suppression by inter-blade dry-friction damping
Original language description
A new approach to calculations based on the modal synthesis method is proposed for the evaluation of structural and dry-friction damping effects on self-excited vibrations due to aeroelastic instability in bladed turbine wheels. The method described herein is used to study dry-friction damping of self-excited vibration of an industrial turbine wheel with 66 blades. For evaluating damping effects, the blade couplings are applied to this particular turbine wheel. Therefore, neighbouring blades are interconnected by rigid arms that are fixed on one side to one blade and are in frictional contact on their free side with the other blade. Due to relatively normal motions in contacts, the prescribed contact forces vary over time. The aerodynamic excitation arises from the spatially periodical flow of steam through the stator blade cascade. In this paper, we attempt to model flow-induced instabilities with the Van der Pol model linked to relative motion between neighbouring blades. The proposed modal synthesis method as ROM is a computationally efficient solution allowing substantial parametrization. The effect of the angles of contact surfaces on the wheel dynamics and on the level of the self-excitation suppression will be discussed herein.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20302 - Applied mechanics

Project
<a href="/en/project/GA20-26779S" target="_blank" >GA20-26779S: Study of dynamic stall flutter instabilities and their consequences in turbomachinery application by mathematical, numerical and experimental methods</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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