ピエゾケーブルによる振動計測に基づく締結状態の評価に関する研究

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  • Evaluation of fastening condition based on vibration measurement using a Piezo-cable

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<p>The structures and the machinery which support social foundation possess many splices. Especially, bolts are the most often used as fastening elements. However, these bolts loosen or break by external forces which act on the fastening parts. As a result, that they may lead to destruction of the structures and the machinery. As the measures to prevent such accidents, periodic inspections are carried out. However, the check by the workers includes problems of time, labor and costs, and the inspection precision is left with doubts. In this research, we have developed a sensor which can monitor the fastening condition based on the change of the shear load applied to the bolts using a piezo-cable. Piezo-cables that we focused on are piezoelectric elements having a piezoelectric effect that generates a voltage in response to external force. It is possible to construct a system of self-check function and to prevent accidents. As a results of monitoring tests using the Bolt Looseness Sensor, when the bolt is tightened, output voltage from the sensor was low. On the other hand, when the bolt is loosened, output voltage from the sensor was high. From these results, the Bolt Looseness Sensor using the Piezo-cables is expected as the sensor for monitoring of the fastening state, because the output voltage from the sensor greatly changed by the change of the fastening state.</p>

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