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H. Ecker, A. Tondl:
"Suppression of self-excited vibrations in valve systems: active means";
Talk: Dynamics of Machines 2007, Prague; 2007-02-06 - 2007-02-07; in: "Proceedings Dynamics of Machines 2007", L. Pesek (ed.); Institute of Thermomechanics ASCR, Prague (2007), ISBN: 978-80-87012-03-1; 55 - 62.

The model of a valve system consisting of a basic system connected to a mass-spring subsystem is investigated. This subsystem represents the mechanism which controls the operation of the valve. The dynamic model is based on the assumption that the flow generated dynamic force acting on the valve is delayed with respect to the static force component. The phenomenon of parametric anti-resonance is used as a means to suppress self-excited valve vibrations. To connect the basic system to the mass-spring subsystem is important and necessary for the usage of parametric excitation as a means for vibration control. At least two vibration modes must exist (one of them must be stable) in order to apply parametric excitation successfully. The results of the numerical investigation of the system show that the parametric anti-resonance, resulting in vibration suppression, also occurs in systems where the source of self-excitation is not a negative linear damping element but introduced by an additional differential equation modelling the retardation of the dynamic force with respect to the static force component.

Self-excitation, parametric excitation, vibration suppression

Project Head Horst Ecker:
Schwingungsunterdrückung durch Parametererregung