Blades Forced Vibration Under Aero-Elastic Excitation Modeled by Van der Pol

0482040 - ÚT 2018 RIV SG eng J - Journal Article
Půst, Ladislav - Pešek, Luděk
Blades Forced Vibration Under Aero-Elastic Excitation Modeled by Van der Pol.
International Journal of Bifurcation and Chaos. Roč. 27, č. 11 (2017), č. článku 1750166. ISSN 0218-1274. E-ISSN 1793-6551
R&D Projects: GA ČR GA16-04546S
Institutional support: RVO:61388998
Keywords : ade vibration * aero-elastic force * self-excitation * van der Pol
OECD category: Applied mechanics
Impact factor: 1.501, year: 2017

This paper employs a new analytical approach to model the influence of aerodynamic excitation
on the dynamics of a bladed cascade at the flutter state. The flutter is an aero-elastic phenomenon
that is linked to the interaction of the flow and the traveling deformation wave in the cascade
when only the damping of the cascade changes. As a case study the dynamic properties of the
five-blade-bunch excited by the running harmonic external forces and aerodynamic self-excited
forces are investigated. This blade-bunch is linked in the shroud by means of the viscous-elastic
damping elements. The external running excitation depends on the ratio of stator and rotor blade
numbers and corresponds to the real type of excitation in the steam turbine. The aerodynamic
self-excited forces are modeled by two types of Van der Pol nonlinear models. The influence of the
interaction of both types of self-excitation with the external running excitation is investigated
on the response curves.
Permanent Link: http://hdl.handle.net/11104/0278080