Contact stiffnesses and nonlinear vibration analysis of bladed disks with friction contacts between adjacent blades

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23640%2F16%3A43930883" target="_blank" >RIV/49777513:23640/16:43930883 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Contact stiffnesses and nonlinear vibration analysis of bladed disks with friction contacts between adjacent blades

Popis výsledku v původním jazyce

This work is focused on the computation of vibrations for the last stage bladed disks of steam turbines. The blades with two integral structural contact (ISC) couplings are considered. The cyclic symmetry properties of bladed disks and the method of modal transformation utilising frequency response function matrices are used to reduce the number of degrees of freedom. Two problems are of the first rate importance here: (i) to obtain reliable results, the so-called "contact stiffnesses" of the interface contact elements must be set correctly to compensate for the omitted higher modes, (ii) to answer the question whether it is well-founded to call the ISC couplings "friction dampers". To do so, three exemplary cases of LSB vibrations are studied: (i) vibrations excited by harmonic travelling wave of two nodal diameters, (ii) activation of a "sleeping" resonance regime by shaft torque excitation, (iii) vibrations of blades excited by harmonic travelling wave of eight nodal diameters.

Název v anglickém jazyce

Contact stiffnesses and nonlinear vibration analysis of bladed disks with friction contacts between adjacent blades

Popis výsledku anglicky

This work is focused on the computation of vibrations for the last stage bladed disks of steam turbines. The blades with two integral structural contact (ISC) couplings are considered. The cyclic symmetry properties of bladed disks and the method of modal transformation utilising frequency response function matrices are used to reduce the number of degrees of freedom. Two problems are of the first rate importance here: (i) to obtain reliable results, the so-called "contact stiffnesses" of the interface contact elements must be set correctly to compensate for the omitted higher modes, (ii) to answer the question whether it is well-founded to call the ISC couplings "friction dampers". To do so, three exemplary cases of LSB vibrations are studied: (i) vibrations excited by harmonic travelling wave of two nodal diameters, (ii) activation of a "sleeping" resonance regime by shaft torque excitation, (iii) vibrations of blades excited by harmonic travelling wave of eight nodal diameters.

Druh

D - Stať ve sborníku

CEP obor

JR - Ostatní strojírenství

OECD FORD obor

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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

2016

Kód důvěrnosti údajů

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

Název statě ve sborníku

The 4th Joint International Conference on Multibody System Dynamics

ISBN

978-0-9682827-9-3

ISSN

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e-ISSN

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Počet stran výsledku

12

Strana od-do

1-12

Název nakladatele

McGill University, University of Waterloo

Místo vydání

Montreal

Místo konání akce

Montreál

Datum konání akce

29. 5. 2016

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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