415 シェーピングされたPVDFセンサとPVDFアクチュエータによるはりの振動制御(知的材料・構造システム)

概要

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In the authors' previous reports, it was shown that piezoelectric films were able to be used as sensors and as actuators simultaneously for free or forced vibration control of flexible thin beams. In these methods, piezoelectric film sensor and actuator were shaped using the equivalent shaping functions and were collocated bonded on the surfaces of the beam. Direct velocity feedback control was successfully applied to add damping to the first vibrational mode. However, multimodal active vibration control experiments using these high-polymer piezoelectric films were difficult in several reasons. One of these difficulties was the unstable vibrations due to the electro magnetic interactions between the sensor and the actuator in high frequency area. In order to overcome this difficulties, it was proposed in this paper to shape piezoelectric sensor and actuator using different shaping functions. At first, fundamental equations were derived and vibration responses of the beam were derived based on the modal coordinate systems. Then, it was shown that by considering phase characteristics of the controller in conjunctions with the polarity of the piezo films at higher order modal frequencies, multimodal control will be implemented both theoretically and experimentally.
2009-11-06