Active parametric vibration control of a smart beam

Various classical methods are available in industry to reduce the vibration level of bladings in turbomachinery. Most of the applied methods are passive in nature and try to increase structural damping by various friction devices. Within the last decade new concepts have been developed to combine beam structures with feedback control and thus produce artificial damping by special piezoelectric actuators applied to the beam structure. In this paper a basic study is carried out on how beam bending vibrations can be damped by feedback controlled parametric excitation forces acting in the direction of the beam axis. The results show that the concept of active parametric damping is very promising. Further simulation and experimental work, however, will be necessary to apply the basic parametric concept to bladings of turbomachinery.