STRUCTURE MONITORING METHOD USING PIEZO-ELECTRIC ELEMENT, AND STRUCTURE MONITORING SYSTEM USING PIEZO-ELECTRIC ELEMENT

摘要

PROBLEM TO BE SOLVED: To eliminate influence of a capacitor of a piezo-electric element and monitor the state of structure and its change by a measuring processing method including an imaginary part. SOLUTION: In a method measuring electric impedance by using a piezo-electric element which functions as an actuator and a sensor, a transfer function (frequency response function) of the structure of state monitoring is computed based on impedance wherein influence of capacitor of the piezo-electric element from electric impedance. As a result, the mode property of structure can be identified in a form including not only a real part of mechanical impedance but also an imaginary part. COPYRIGHT: (C)2004,JPO