Original title: Running excitation of blades bunches
Authors: Půst, Ladislav ; Pešek, Luděk
Document type: Papers
Conference/Event: DYMAMESI 2014, Praha (CZ), 2014-11-25 / 2014-11-26
Year: 2014
Language: eng
Abstract: Application of additional damping elements or friction connection into blades’ shroud very effectively restricts undesirable vibrations of turbine blades vibrations. The previous investigation of dynamic properties of five-blades-model connected either by a rubber element, by direct Coulomb friction contact or by modified Coulomb friction contact showed very positive results. However, only one type of excitation force vector with one harmonic force acting on the first mass has been used in these studies. Proposed paper will be oriented on the response of the same fiveblades- bunch provided again by means of the same types of dry friction damping connections, but excited by running harmonic force. This type of excitation corresponds better to the real excitation in the steam or gas turbine. Influence of friction forces type, running velocity (depends on ratio of stator and rotor blades numbers), amplitudes of excitation forces, etc. will be analysed and presented.
Keywords: damping; delayed harmonic excitation; dry friction; five-blades-bunch
Host item entry: DYMAMESI 2014 : Dynamics of machines and mechanical systems with interactions, ISBN 978-80-87012-54-3

Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0241596

Permalink: http://www.nusl.cz/ntk/nusl-180329


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Research > Institutes ASCR > Institute of Thermomechanics
Conference materials > Papers