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T. Pumhössel:
"Parametric control of blade vibrations in rotating machinery";
Talk: 4th International Symposium on Stability Control of Rotating Machinery (ISCORMA-4), Calgary, Canada; 2007-08-27 - 2007-08-31; in: "Proceedings of the 4th International Symposium on Stability Control of Rotating Machinery", Bently Pressurized Bearing Comp., (2007), Paper ID 501, 12 pages.

Parametric control is a useful method to reduce the vibrations of mechanical structures. For many applications
the blading of rotating machines can be modeled as cantilever beams. In this paper the stiffness
parameter of a cantilever beam structure representing a single blade model is subject of variation due to an
applied feedback controlled parametric excitation force. A string is used inside the beam combined with a
sensor/actuator system to apply this parametric force.
Based on [1] and [2] a nonlinear feedback control law using state-dependent amplification of the axial
velocity of the beam tip is developed to introduce artificial damping to the beam lateral motion, and to
achieve boundedness of the applied force. The latter property is of importance for practical applications.
Numerical simulations show that with the presented control law the artificial damping of the beam lateral
motion can be increased significantly compared to [2]

Parametric Control, Active Systems, Feedback Control, Blade Dynamics