Non-linear Vibration of Planar Case of Three-blade Bundle with Dry Friction Contacts

0584551 - ÚT 2024 CZ eng C - Konferenční příspěvek (zahraniční konf.)
Šnábl, Pavel - Pešek, Luděk - Půst, Ladislav
Non-linear Vibration of Planar Case of Three-blade Bundle with Dry Friction Contacts.
Computational Mechanics 2018 - Book of extended abstracts. Plzeň: University of West Bohemia, Plzeň, 2018 - (Adámek, V.; Jonášová, A.), s. 107-108. ISBN 978-80-261-0819-1.
[Computational Mechanics 2018 /34./. Srní (CZ), 31.10.2018-02.11.2018]
Grant CEP: GA ČR GA16-04546S
Institucionální podpora: RVO:61388998
Klíčová slova: dry friction * turbine blades * non-linear vibration * numerical simulation
Obor OECD: Applied mechanics
https://dspace5.zcu.cz/handle/11025/30831

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.
Trvalý link: https://hdl.handle.net/11104/0352511