Piezoelectric-based vibration damping and control of turbomachinery bladed disks

A vibration reduction concept, resonance frequency detuning, is presented and considered for application to turbomachinery bladed disks (blisks). Using piezoelectric material under short- or open-circuit conditions to alter the blade natural frequency, the structure is detuned from a changing excitation frequency, thus avoiding resonance. This approach is applicable to all vibration modes that strain the piezoelectric material, and higher electromechanical coupling coefficients produce greater response reductions. High damping, high sweep rate, and high coupling coefficient minimize peak response levels. For low damping and low sweep rates, resonance frequency detuning has a higher relative impact. For a range of expected values, peak reductions of 50% are certainly achievable. Experiments show qualitative agreement with simulations.