Running excitation of blades bunches

0437086 - ÚT 2015 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Půst, Ladislav - Pešek, Luděk
Running excitation of blades bunches.
DYMAMESI 2014 : Dynamics of machines and mechanical systems with interactions. Praha: Institute of Thermomechanics AS CR, 2014 - (Zolotarev, I.; Pešek, L.), s. 45-52. ISBN 978-80-87012-54-3.
[DYMAMESI 2014. Praha (CZ), 25.11.2014-26.11.2014]
Institucionální podpora: RVO:61388998
Klíčová slova: damping * dry friction * five-blades-bunch * delayed harmonic excitation
Kód oboru RIV: BI - Akustika a kmity

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.
Trvalý link: http://hdl.handle.net/11104/0241596