Passively Shunted Piezoelectric Damping of Centrifugally -Loaded Plates

Res earchers at NASA Glenn Research Center have been investigating shunted piezoelectric circuits as potential damping treatment s fo r turbomachinery rotor blades. This effort seek s to determine the effects of centrifugal loading on passively -shunted piezoelect ric damped plates. Passive s hunt circuit parameters are optimized for the plate’s third bending mode . Tests are performed both non -spinning and in the Dynamic Spin Facility to verify the analysis, and to determine the effectiveness of the damping under cen trif ugal loading. Results show that a resistive shunt circuit will reduce resonant vibration for this configuration. However, a tuned shunt circuit will be required to achieve the desired damping level. The analysis and testing address several issues with passive shunt circuit implementation in a rotating system, including piezoelectric material integrity under centrifugal loading, shunt circuit implementation, and tip mode damping.

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