圧電素子を用いた受動制振システムにおける一般化電気機械結合係数の簡易同定手法の提案

摘要

This paper proposes a simple identification system of generalized electromechanical coupling coefficient for passive vibration suppression system by piezoelectric element. The proposed system consists of piezoelectric element, external impedance, voltage source and bridge circuit. Voltage input causes the resonant oscillations of the system and the system yields some resonant frequencies which can be observed from the voltage output of bridge circuit. Applying a formula to the obtained frequencies, the generalized electromechanical coupling coefficient is identified. In the proposed method the method of excitation and measuring of the resonant oscillations are realized by electric and electronic components while the excitation of the conventional method is done by mechanical method. Consequently, the proposed system can be realized in compact and simple configuration and the identification can be realized in simple procedure. Passive vibration suppression system is designed by the use of the parameter which is identified by the proposed method. And experiment of the vibration suppression validates the proposed method.%振動が生じるような梁や板などの柔軟要素に圧電素子を貼り付け，その圧電素子の端子間にコイル，抵抗，コンデンサなどの素子を接続することによって受動制振システムを実現できる．このようなシステムは，小型かつ簡単な構成で振動を抑制することが可能であり，駆動エネルギを必要としないことから，様々な分野への適用が期待されている．制振性能は接続する素子の値によって決定され，これらの値は機械力学における動吸振器の考え方に基づいて決定されることが多い．