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Original title:
Non-linear Vibration of Planar Case of Three-blade Bundle with Dry Friction Contacts
Authors: Šnábl, Pavel ; Pešek, Luděk ; Půst, Ladislav
Document type: Papers
Conference/Event: Computational Mechanics 2018 /34./, Srní (CZ), 20181031
Year: 2018
Language: eng
Abstract: 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.
Keywords: dry friction; non-linear vibration; numerical simulation; turbine blades
Project no.: GA16-04546S (CEP)
Funding provider: GA ČR
Host item entry: Computational Mechanics 2018 - Book of extended abstracts, ISBN 978-80-261-0819-1
Note: Související webová stránka: https://dspace5.zcu.cz/handle/11025/30831
Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: https://hdl.handle.net/11104/0352511
Permalink: http://www.nusl.cz/ntk/nusl-613905
The record appears in these collections:
Research > Institutes ASCR > Institute of Thermomechanics
Conference materials > Papers
Authors: Šnábl, Pavel ; Pešek, Luděk ; Půst, Ladislav
Document type: Papers
Conference/Event: Computational Mechanics 2018 /34./, Srní (CZ), 20181031
Year: 2018
Language: eng
Abstract: 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.
Keywords: dry friction; non-linear vibration; numerical simulation; turbine blades
Project no.: GA16-04546S (CEP)
Funding provider: GA ČR
Host item entry: Computational Mechanics 2018 - Book of extended abstracts, ISBN 978-80-261-0819-1
Note: Související webová stránka: https://dspace5.zcu.cz/handle/11025/30831
Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: https://hdl.handle.net/11104/0352511
Permalink: http://www.nusl.cz/ntk/nusl-613905
The record appears in these collections:
Research > Institutes ASCR > Institute of Thermomechanics
Conference materials > Papers
Record created 2024-04-15, last modified 2024-04-15