Detection of cracks in rotating machinery using the method of electromechanical impedance

摘要

Detection of cracks in rotating machinery using the method of electromechanical impedance. The present invention is a technique for detection of cracks in rotating machinery based on electromechanical impedance method.This technique uses impedance transducers, piezoelectric transducers, coupled to the rotor to monitor changes in the properties of the mass, stiffness and / or damping. In this method, measure the electrical impedance of each transducer at different instants of time (daily, weekly or monthly).As the properties of the transducer is maintained over time, changes in electrical impedance signals measured are related to changes in mechanical impedance, which is affected by the presence of broken rice.