Title: Non-linear vibration of planar case of three-blade bundle with dry friction contacts
Authors: Šnábl, P.
Pešek, L.
Půst, L.
Citation: Computational mechanics 2018: book of extended abstracts: 34th conference with international participation, p. 107-108.
Issue Date: 2018
Publisher: Západočeská univerzita v Plzni
Document type: konferenční příspěvek
URI: http://hdl.handle.net/11025/30831
ISBN: 978-80-261-0819-1
Keywords: suchá frikce;lopatky turbíny;nelineární vibrace;numerická simulace
Keywords in different language: dry friction;turbine blades;non-linear vibration;numerical simulation
Abstract in different language: Using dry friction couplings (so called tie-bosses) between the blades in turbine rotors can be used to suppress dangerous resonant vibrations of turbine blades and it has been studied on our institute on various models. Experimental setup of three-blade bundle was built along with bladed wheel. The first set-up of the bundle was with blades turned 45 degrees to the disc plane. In that case the deformation of the blades causes turning of the ends of tie-bosses and edge contact together with multi-directional slip occurs. The experimental set-up was simplified herein so that the blades are parallel to the disc plane and in-line slip occurs. Although single electromagnet was used to excite the system, the first mode of vibration with no slip in tie-bosses just occurred. In case of bladed wheel, all blades have coupling through tie-bosses with neighbouring blades which stiffen them and raise their eigenfrequency. In our case, a mistuning by reducing mass of side blades caused similar behaviour. Steel to steel contact pair was used for the first tests.
Rights: Copyright © 2018 University of West Bohemia, Plzeň, Czech Republic
Appears in Collections:Computational mechanics 2018
Computational mechanics 2018

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