About: Influence of delayed excitation on vibrations of turbine blades couple

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	In the presented paper, the computational model of the turbine blade couple is investigated with the main attention to the influence two harmonic excitation forces, having the same frequency and amplitude but with moderate delay in time. Time delay between the exciting harmonic forces depends on the revolutions of bladed disk, on number of blades on rotating disk and on number of stator blades. The reduction of resonance vibrations realized by means of dry friction between the shroud blade-heads increases roughly proportional to the difference of stator and rotor blade-numbers and also to the magnitude of dry friction force. From the analysis of blade couple with direct contact it was proved that the increase of friction forces causes decrease of resonance peaks, but the influence of elastic micro-deformations in the contact surfaces (modeled e.g. by the modified Coulomb dry friction law) is rather small. Analysis of blade couple with friction element show that the lower number of stator blades has negligible influences on the amplitudes of both blades, but decreases amplitudes of friction element oscillations. Similarly the increase of friction forces causes decrease of resonance peaks, but increase of friction element amplitudes. In the presented paper, the computational model of the turbine blade couple is investigated with the main attention to the influence two harmonic excitation forces, having the same frequency and amplitude but with moderate delay in time. Time delay between the exciting harmonic forces depends on the revolutions of bladed disk, on number of blades on rotating disk and on number of stator blades. The reduction of resonance vibrations realized by means of dry friction between the shroud blade-heads increases roughly proportional to the difference of stator and rotor blade-numbers and also to the magnitude of dry friction force. From the analysis of blade couple with direct contact it was proved that the increase of friction forces causes decrease of resonance peaks, but the influence of elastic micro-deformations in the contact surfaces (modeled e.g. by the modified Coulomb dry friction law) is rather small. Analysis of blade couple with friction element show that the lower number of stator blades has negligible influences on the amplitudes of both blades, but decreases amplitudes of friction element oscillations. Similarly the increase of friction forces causes decrease of resonance peaks, but increase of friction element amplitudes. (en)
Title	Influence of delayed excitation on vibrations of turbine blades couple Influence of delayed excitation on vibrations of turbine blades couple (en)
skos:prefLabel	Influence of delayed excitation on vibrations of turbine blades couple Influence of delayed excitation on vibrations of turbine blades couple (en)
skos:notation	RIV/61388998:_____/13:00394620!RIV14-GA0-61388998
http://linked.open...avai/predkladatel	Ústav termomechaniky AV ČR, v.v.i.
http://linked.open...avai/riv/aktivita	I P
http://linked.open...avai/riv/aktivity	I, P(GA101/09/1166)
http://linked.open...iv/cisloPeriodika	1
http://linked.open...vai/riv/dodaniDat	2014
http://linked.open...aciTvurceVysledku	Pešek, Luděk Půst, Ladislav
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav termomechaniky AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	79723
http://linked.open...ai/riv/idVysledku	RIV/61388998:_____/13:00394620
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	time delay; phase delay; blades couple; amplitude reduction; dry friction (en)
http://linked.open.../riv/klicoveSlovo	amplitude reduction dry friction blades couple phase delay time delay
http://linked.open...odStatuVydavatele	CZ - Česká republika
http://linked.open...ontrolniKodProRIV	[D05F9A710F37]
http://linked.open...i/riv/nazevZdroje	Applied and Computational Mechanics
http://linked.open...in/vavai/riv/obor	BI
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	2 (xsd:int)
http://linked.open...vavai/riv/projekt	Research of dynamic behaviour and optimalization of complex rotating systems with non-linear couplings and high damping materials
http://linked.open...UplatneniVysledku	2013
http://linked.open...v/svazekPeriodika	7
http://linked.open...iv/tvurceVysledku	Pešek, Luděk Půst, Ladislav
issn	1802-680X
number of pages	14 (xsd:int)

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