Title: Influence of delayed excitation on vibrations of turbine blades couple
Authors: Půst, Ladislav
Pešek, Luděk
Citation: Applied and Computational Mechanics. 2013, vol. 7, no. 1, p. 39-52.
Issue Date: 2013
Publisher: University of West Bohemia
Document type: článek
URI: http://www.kme.zcu.cz/acm/index.php/acm/article/view/198/211
ISSN: 2336-1182 (Online)
1802-680X (Print)
Keywords: redukce amplitudy;suchá frikce;výpočetní model;vibrace;lopatky turbíny
Keywords in different language: amplitude reduction;dry friction;computational model;vibrations;turbine blades
Abstract: 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 the number of blades on a rotating disk and on the 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 a blade couple with a friction element shows that the lower number of stator blades has negligible influence on the amplitudes of both blades, but decreases amplitudes of the friction element oscillations. Similarly the increase of friction forces causes a decrease of resonance peaks, but an increase of friction element amplitudes.
Rights: © 2013 University of West Bohemia. All rights reserved.
Appears in Collections:Volume 7, number 1 (2013)
Volume 7, number 1 (2013)

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