Piezoelectric Tailoring with Enhanced Electromechanical Coupling for Concurrent Vibration Control of Mistuned Periodic Structures

摘要

The objective of this research is to advance the state of the art of vibration control of mistuned periodic structures utilizing the electromechanical coupling and damping characteristics of piezoelectric networking. in this investigation, an active coupling enhancement approach through negative capacitance has been developed to increase the piezolectric electromechanical coupling. Experiments were carried out to validate the delocalization concept of the piezoelectric network. it was verified that the vibration localization level in a mistuned periodic structure can be reduced by using the piezoelectric networking and further improved by the negative capacitance. The piezoelectric networking concept was further extended and investigated as an effective means for vibration suppression of mistuned bladed disks. An optimal network was analytically derived and the performance and robustness of the optimal network was analyzed numerically through Monte Carlo simulation. The analysis showed that the optimal network can effectively suppress vibration of bladed disk systems under multiple spatial harmonic excitations, and is effective for mistuned systems. The optimal network is also robust against variations in circuitry parameters. Experiments were performed to demonstrate the multiple spatial harmonic vibration suppression effect of the piezoelectric network on a coupled blade and disk system. The test results verified the analytical predictions and showed that the proposed approach is effective in suppressing multiple engine order excitations.