INNOVATIVE APPLICATIONS OF PIEZOELECTRIC CERAMIC FOR STRUCTURAL IMPULSE EVENTS MONITORING

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2016-12-12

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Abstract

Structural impulse events, such as impact events by foreign object on structures and leakage events of high-pressure containers, always endanger the integrity of the structures and may lead to serious consequences if undetected, which highlight the structural health monitoring with the capability of detection and location of the impulse events in a rapid pace. The piezoelectricity of piezoelectric ceramic materials enables the applications in structural health monitoring. This dissertation developed an innovative algorithm and investigated the piezoelectric ceramic sensors to estimate the propagation distances of versatile ultrasonic guided waves. Based on the algorithm, the impulse events were detected and located on various structures, such as underwater pipelines, metal plates and concrete columns. In another application, piezoelectric ceramic sensors were used to detect the dynamic response of the negative pressure wave (NPW), and locate leakage events on a gas pipeline. Since the characteristics of ultrasonic guided waves include dispersion, multi-mode, mode-conversion and rate of attenuation, it is a great challenge to utilize the information of the ultrasonic guided waves captured by piezoelectric ceramic sensors to locate the source of the ultrasonic guided waves. An innovative algorithm was established to pinpoint the time of arrival of the ultrasonic guided waves, and estimate the propagation distance. Experiments for diverse dimensions, including underwater steel pipeline as one-dimensional structures, metal plates as two-dimensional structures and concrete structures, were established to verify the feasibility of the innovative algorithm in different applications of structural health monitoring. The results demonstrated that the impact events can be successfully detected and located with commendable accuracy and precision in real time. Based on the research of negative pressure waves introduced by the leakage events on the gas pipeline, the leakage detection and location with piezoelectric ceramic sensors were investigated. This dissertation proposed an effective passive sensing method with piezoelectric ceramic sensors to monitoring the leakage events of the gas pipeline. Compared with the location of the leakage events with fiber optic sensors, experimental results illustrated that the leakage location with piezoelectric ceramic sensors improved the accuracy greatly on the same model pipeline.

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PIEZOELECTRIC CERAMIC, STRUCTURAL IMPULSE EVENTS MONITORING

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