An identification method of generalized electromechanical coupling coefficient with compact structure and simple procedure

This paper proposes an identification system of the important parameter (generalized electromechanical coupling coefficient) for passive vibration suppression system by piezoelectric element which has compact structure and simple procedure. 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. Then, a conventional formula can be applicable to the obtained frequencies to identify the generalized electromechanical coupling coefficient. Consequently, the 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, i.e. the system can be realized by quite compact configuration compared to conventional method. Furthermore, it is analytically shown that the obtained frequencies have clear relationship about their magnitudes and that the relations contribute to the effective identification 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.