Multipoint electromagnetic excitation for experimental investigation of rotating bladed wheel dynamics

0546975 - ÚT 2022 RIV PL eng C - Konferenční příspěvek (zahraniční konf.)
Pešek, Luděk - Šnábl, Pavel - Půst, Ladislav - Bula, Vítězslav - Cibulka, Jan
Multipoint electromagnetic excitation for experimental investigation of rotating bladed wheel dynamics.
27th International Congress on Sound and Vibration: ICSV27. Gliwice, Poland: Silesian University Press, 2021 - (Carletti, E.; Crocker, M.; Pawelczyk, M.; Tuma, J.), č. článku 176. ISBN 978-83-7880-799-5. ISSN 2329-3675.
[ICSV27- International Congress on Sound and Vibration /27./. Virtual, Online (CZ), 11.07.2021-16.07.2021]
Grant CEP: GA ČR(CZ) GA20-26779S
Institucionální podpora: RVO:61388998
Klíčová slova: rotational tests * bladed wheels * travelling waves * electromagnets * dynamics
Obor OECD: Applied mechanics
https://www.icsv27.org/

Modern turbine bladed wheels are designed for higher operating temperatures and flow rates. How-ever, the trend of producing ever-longer and ever-thinner blades leads to lower dynamic stiffness. Therefore, dynamic stiffness and structural damping must be increased by additional structural ele-ments, e.g. tie-bosses, shroud connections. Such a complex mechanical structures with dry friction contacts require very precise experimental investigation under rotation. However, verification of their dynamics needs also sufficient force capacity of contactless excitation to exceed the adhesion forces in contacts. Therefore we have dealt with a development of multipoint electromagnetic exci-tation systems in our rotary laboratory. We use two strategies of excitation. The strategy A is based on the affinity of excitation forces to the travelling waves when analytical solution serves for design of the optimal space distribution and time dependences of the multipoint electromagnetic excitation. As to the placement of electromagnets and phase shift of the excitation harmonic signals, it is de-pendent on number of nodal diameters. At the strategy B, the electromagnetic pulses are synchro-nized with wheel revolutions and with dynamic responses of selected blades measured by the strain-gauge system. It requires accurate synchronization of the electromagnets with wheel revolutions and with a dynamic response of the selected blade.
Trvalý link: http://hdl.handle.net/11104/0327260