Piezoelectric-Based Vibration Reduction on Pre-Twisted Blades with Centrifugal Loads

摘要

Turbomachinery blades experience large periodic aerodynamic loads that can lead to high-cycle fatigue and possibly catastrophic failure. Piezoelectric-based vibration reduction represents a possible solution to increase blade lifetime and reduce risk of premature failure. Integrating piezoelectric material into the blade enables tailoring of structural properties. Ideal manipulation of the electrical boundary conditions can effectively detune the structural resonance frequency from the excitation frequency, reducing vibration. Previous analyses of piezoelectric-based vibration reduction of turbomachinery blades provide results for simplified mechanical systems, and do not consider blade twist or centrifugal loading. This paper uses an assumed modes model with a span-chord-normal coordinate system to capture the effects of blade twist and centrifugal loading on piezoelectric-based vibration reduction. Specifically, this study investigates how the electromechanical coupling coefficient varies with increasing blade twist and rotation speed. Overall, rotation speed can significantly affect coupling, making it critical to ensure the piezoelectric material has good coupling at the rotation speed associated with each resonance crossing.