Nonlinear vibration analysis of steam turbine rotating wheel equipped with the LSB48 blades

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23520%2F15%3A43932373" target="_blank" >RIV/49777513:23520/15:43932373 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/49777513:23640/15:43932373

Výsledek na webu

<a href="http://dx.doi.org/10.6567/IFToMM.14TH.WC.OS4.007" target="_blank" >http://dx.doi.org/10.6567/IFToMM.14TH.WC.OS4.007</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.6567/IFToMM.14TH.WC.OS4.007" target="_blank" >10.6567/IFToMM.14TH.WC.OS4.007</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Nonlinear vibration analysis of steam turbine rotating wheel equipped with the LSB48 blades

Popis výsledku v původním jazyce

Currently, long blades of rotating wheels of steam turbines’ low-pressure stages comprise integral structural contact elements. The contact elements reinforce the bladed disk, which leads to re-tuning its natural frequencies. But they also act as friction dampers in the case of higher vibrations caused by undesirable excitation sources. The development of the long steam turbine blades is closely related to the computer modelling of the above-mentioned vibrations. In this work, two cases of excitation of nonlinear vibrations of the bladed disk equipped with the LSB48 blades are investigated: (i) travelling-wave excitation with two nodal diameters and (ii) the excitation by earthquake forces in horizontal direction of the rotation axis. The cyclic symmetry properties of the bladed disk are used for the calculations. Contact areas between blades are modelled using coupling elements implementing dry Coulomb friction. Finally, the accuracy of the mathematical model and the concept of the contact stiffness are discussed.

Název v anglickém jazyce

Nonlinear vibration analysis of steam turbine rotating wheel equipped with the LSB48 blades

Popis výsledku anglicky

Currently, long blades of rotating wheels of steam turbines’ low-pressure stages comprise integral structural contact elements. The contact elements reinforce the bladed disk, which leads to re-tuning its natural frequencies. But they also act as friction dampers in the case of higher vibrations caused by undesirable excitation sources. The development of the long steam turbine blades is closely related to the computer modelling of the above-mentioned vibrations. In this work, two cases of excitation of nonlinear vibrations of the bladed disk equipped with the LSB48 blades are investigated: (i) travelling-wave excitation with two nodal diameters and (ii) the excitation by earthquake forces in horizontal direction of the rotation axis. The cyclic symmetry properties of the bladed disk are used for the calculations. Contact areas between blades are modelled using coupling elements implementing dry Coulomb friction. Finally, the accuracy of the mathematical model and the concept of the contact stiffness are discussed.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20301 - Mechanical engineering

Projekt

<a href="/cs/project/TE01020068" target="_blank" >TE01020068: Centrum výzkumu a experimentálního vývoje spolehlivé energetiky</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2015

Kód důvěrnosti údajů

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

Název statě ve sborníku

The 14th IFToMM World Congress, Taipei, Taiwan, October 25-30, 2015

ISBN

978-986-04-6098-8

ISSN

—

e-ISSN

neuvedeno

Počet stran výsledku

8

Strana od-do

—

Název nakladatele

International Federation for the Promotion of Mechanism and Machine Science

Místo vydání

Taipei

Místo konání akce

Taipei, Taiwan

Datum konání akce

25. 10. 2015

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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