Vibration Reduction of Mistuned Bladed Disks by Passive Piezoelectric Shunt Damping Techniques

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Vibration Reduction of Mistuned Bladed Disks by Passive Piezoelectric Shunt Damping Techniques

Zhou, B. / Thouverez, F. / Lenoir, D.

This paper presents a vibration control strategy based on the passive piezoelectric shunt damping technique for mistuned bladed disks. Resonant shunted piezoelectrics are attached onto the disk surface between adjacent blades to dissipate the mechanical energy. This strategy is of engineering interest because piezoelectric transducers are placed outside of the main stream in turbomachinery. This idea is developed based on a lumped-parameter bladed disk model. Both piezoelectric shunt damping and piezoelectric mistuning are introduced to minimize the blade mistuning effect. First, a tuning design is carried out to damp a specified mode for the tuned bladed disk. When blade mistuning is taken into account, a further vibration reduction is achieved by introducing an optimal piezoelectric mistuning pattern obtained by a genetic algorithm. In reality, the blade mistuning pattern is not constant in the long run. Because of various complexities, a perturbation of the blade mistuning pattern might result. In benefitting from the manageability and controllability of piezoelectric shunt circuits, an adaptive control strategy is developed to adjust the “optimal” piezoelectric mistuning pattern according to the perturbation. Numerical simulation reveals that good performance is achieved in terms of reducing the vibration of slowly time-variant, mistuned bladed disks.