Design of test excitation of travelling waves of rotating bladed wheel with multipoint electromagnetic excitation

0364697 - ÚT 2012 RIV DE eng C - Conference Paper (international conference)
Pešek, Luděk - Vaněk, František - Veselý, Jan - Bula, Vítězslav - Cibulka, Jan
Design of test excitation of travelling waves of rotating bladed wheel with multipoint electromagnetic excitation.
Neunte internationale Tagung Schwingungen in Rotierenden Maschinen - SIRM 2011. Darmstadt: Technische Universität Darmstadt, 2011, s. 1-11. ISBN 978-3-9814163-0-5.
[SIRM 2011 - International Conference on Vibrations in Rotating Machines /9./. Darmstadt (DE), 21.02.2011-23.02.2011]
R&D Projects: GA ČR GA101/09/1166
Institutional research plan: CEZ:AV0Z20760514
Keywords : bladed wheel * multipoint excitation * travelling waves * electromagnetic
Subject RIV: BI - Acoustics

The analytical expressions for description of travelling waves in rotating blade wheels are presented in the contribution. Based on the affinity of excitation forces to the travelling waves, the expressions served for design of the optimal distribution and time dependences of the multipoint electromagnetic excitation. Both axissymmetric case of the wheel characterized by multiple eigenvalues and the wheel with imperfection causing the split of this multiplicity were considered. Demonstration of travelling wave awakening is shown on the simple numerical example. The theoretical findings are verified experimentally on the case of free supported ring in non-rotating state and test blade disc under rotation, too.
Permanent Link: http://hdl.handle.net/11104/0200109