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Laboratory Validation of a Piezoelectric Scour Monitoring Sensor

机译:压电冲刷监测传感器的实验室验证

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Water current-induced vortices can scour sediments from around overwater bridge piers and abutments. If extended over a critical depth, bridge scour can cause significant damage and potentially even structural failure. Several promising scour depth sensing systems have been developed over the years, but they still suffer from issues including signal inaccuracy, installation difficulty, and high costs. This research focuses on evaluating the use of a prototype piezoelectric scour depth sensor, in which a poly(vinylidene fluoride) (PVDF) polymer strip forms the main sensing component. Extensive laboratory experiments were performed in which the sensors were driven into the soil surrounding a pier inside a flume simulating scour conditions. As the scour hole extended, the exposed length of each sensor changed, causing the. flow-induced voltage signal to also vary. Scour depth at each sensor location was determined based on the fact that the dynamics of the voltage time history response is related to the exposed length of the piezoelectric sensor.
机译:水流引起的涡流可以冲刷水上桥墩和桥台周围的沉积物。如果延伸到临界深度,则桥梁冲刷会导致严重的损坏,甚至可能导致结构破坏。多年来,已经开发了几种有希望的冲刷深度传感系统,但是它们仍然遭受信号不准确,安装困难和成本高等问题的困扰。这项研究的重点是评估原型压电冲刷深度传感器的使用,其中聚偏二氟乙烯(PVDF)聚合物条带是主要的传感组件。进行了广泛的实验室实验,其中将传感器驱动到模拟冲刷条件的水槽内码头周围的土壤中。随着冲刷孔的延伸,每个传感器的裸露长度发生变化,从而引起了。流感应电压信号也要变化。根据电压时程响应的动力学与压电传感器的裸露长度有关的事实来确定每个传感器位置的冲刷深度。

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