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Active vibration control of nonlinear cantilever shaped blades in turbomachinery
The reduction of vibrations of turbomachinery blades performing natural and/or forced bending vibrations can be realized by various passive methods like the use of friction devices in order to increase structural damping, or by introducing a parametric excitation to suppress self-excited vibrations. Beside passive methods so-called active systems have been developed. In such systems the vibration level of a structure can be reduced by introducing feedback controlled excitation forces or moments. In this paper, a feedback controlled parametric excitation force is applied to a cantilever beam structure representing a simple model for a blade. Special attention is paid to the practical realisation of the excitation force in the beam structure, and therefore a combined actuator/sensor system is located within the beam clamping system. The numerical simulation results show that artificial damping can be introduced to the mechanical system. In this paper a feedback controlled parametric excitation force was applied to a tubular cantilever beam using a string located inside the beam, along with a sensor/actuator system. A simple model with three degrees of freedoms was carried out including nonlinear displacement terms up to cubic order. The applied feedback control law introduces a nonlinear damping term to the equation of motion for the beam bending displacement. Numerical results show the effectiveness of the chosen feedback control law. Further analytical and experimental work will be done to improve the control law and to validate the numerical results by experimental investigations.
Active vibration control of nonlinear cantilever shaped blades in turbomachinery
The reduction of vibrations of turbomachinery blades performing natural and/or forced bending vibrations can be realized by various passive methods like the use of friction devices in order to increase structural damping, or by introducing a parametric excitation to suppress self-excited vibrations. Beside passive methods so-called active systems have been developed. In such systems the vibration level of a structure can be reduced by introducing feedback controlled excitation forces or moments. In this paper, a feedback controlled parametric excitation force is applied to a cantilever beam structure representing a simple model for a blade. Special attention is paid to the practical realisation of the excitation force in the beam structure, and therefore a combined actuator/sensor system is located within the beam clamping system. The numerical simulation results show that artificial damping can be introduced to the mechanical system. In this paper a feedback controlled parametric excitation force was applied to a tubular cantilever beam using a string located inside the beam, along with a sensor/actuator system. A simple model with three degrees of freedoms was carried out including nonlinear displacement terms up to cubic order. The applied feedback control law introduces a nonlinear damping term to the equation of motion for the beam bending displacement. Numerical results show the effectiveness of the chosen feedback control law. Further analytical and experimental work will be done to improve the control law and to validate the numerical results by experimental investigations.
Active vibration control of nonlinear cantilever shaped blades in turbomachinery
Aktive Schwingungsregelung von nichtlinearen, kragträgerförmigen Schaufeln in Strömungsmaschinen
Pumhössel, Thomas (author) / Springer, Helmut (author)
2006
10 Seiten, 7 Bilder, 1 Tabelle, 8 Quellen
Conference paper
English
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