Modal Synthesis Method for Inter-Blade Dry-Friction Surface Angle Design of Turbine Wheel for Vibration Suppression

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F22%3A00564708" target="_blank" >RIV/61388998:_____/22:00564708 - isvavai.cz</a>

Result on the web

<a href="https://asmedigitalcollection.asme.org/IDETC-CIE/proceedings-abstract/IDETC-CIE2022/86311/V010T10A022/1150693" target="_blank" >https://asmedigitalcollection.asme.org/IDETC-CIE/proceedings-abstract/IDETC-CIE2022/86311/V010T10A022/1150693</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1115/DETC2022-88382" target="_blank" >10.1115/DETC2022-88382</a>

Result language

angličtina

Original language name

Modal Synthesis Method for Inter-Blade Dry-Friction Surface Angle Design of Turbine Wheel for Vibration Suppression

Original language description

New calculation approach based on modal synthesis method is proposed for evaluation of structural and dry-friction damping effect on self-excited vibrations due to aero-elastic instability in the bladed turbine wheels. The aerodynamic excitation arises from the spatially periodical flow of steam through the stator blade cascade. The self-excited aero-elastic forces of blades are described by Van der Pol model. The proposed method as reduced order method (ROM) simplified approach is computationally efficient solution allowing to estimate effect of many important blade cascade parameters of such a complex non-linear mechanical system. The paper is aimed at the narrow frequency range of nozzle excitation and on the case when a slip motion is prevailing in the contacts. The method is applied herein to an industrial turbine wheel design with 66 blades. For evaluation of damping effect, the tie-boss and shroud couplings are applied. Therefore, neighboring blades are interconnected by rigid arms that are on one side fixed to one blade and are in friction contact on their free side with the other blade. Static normal contact forces are prescribed in contact point pairs at the initial state. Due to relative normal motions in contacts, the prescribed contact forces vary in time. Friction forces in contacts are driven by the modified Coulomb friction law. The effect of the angles of inter-blade contact surfaces on the wheel dynamics and on level of friction damping is discussed.

Czech name

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Czech description

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Type

D - Article in proceedings

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

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Proceedings of the ASME Design Engineering Technical Conference

ISBN

978-079188631-1

ISSN

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e-ISSN

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Number of pages

3

Pages from-to

V010T10A022

Publisher name

American Society of Mechanical Engineers (ASME)

Place of publication

New York

Event location

St. Louis, Missour

Event date

Aug 14, 2022

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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