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SISTEMA INTEGRAL DE INFORMACIÓN ACADÉMICA - PÚBLICO
Título del libro: Proceedings Of The Asme Turbo Expo Título del capítulo: EFFECTIVENESS TESTING OF AN INVERSE METHOD FOR BALANCING NONLINEAR ROTORDYNAMIC SYSTEMS
Modern aero-engine structures typically have at least two nested rotors
mounted within a flexible casing via squeeze-film damper (SFD) bearings.
The inaccessibility of the HP rotor under operational conditions
motivates the use of a non-invasive inverse problem procedure for
identifying the unbalance. Such an inverse problem requires prior
knowledge of the structure and measurements of the vibrations at the
casing. Recent work by the authors reported a non-invasive inverse
method for the balancing of rotordynamic systems with nonlinear
squeeze-film damper (SFD) bearings, which overcomes several limitations
of earlier works. However, it was not applied to a common practical
configuration wherein the HP rotor is mounted on the casing via just one
weak linear connection (retainer spring), with the other connections
being highly nonlinear SFDs. The analysis of the present paper considers
such a system. It explores the influence of the condition number and how
it is affected as the number of sensors and/or measurement speeds is
increased. The results show that increasing the number of measurement
speeds has a far more significant impact on the conditioning of the
problem than increasing the number of sensors. The balancing
effectiveness is reasonably good under practical noise level conditions,
but significantly lower than obtained for the previously considered
simpler configurations.
Entidades citadas de la UNAM:
Fuente:
ISBN: 9780791851135 Editorial: American Society of Mechanical Engineers (ASME)