高架橋の健全性診断のための自立型振動センサの開発

抄録

A novel vibration-sensing device based on the giant magnetostrictive effect for a self-powered structural health monitoring system was developed. This device can produce a large voltage because the magnetostrictive rod, in principle, can generate a large variation in magnetic flux density, even when it is subjected to small and low-frequency vibrations of the bridge girder. Therefore, the device could function as a power generator to supply power to a storage battery, when it is not being used as a vibration sensor, to drive the electric circuit . A field test was conducted to check the power generation function and sensing function of developed vibration-sensing device. The experimental results confirmed that the amount of energy of 1mW was obtained by passing one car, and the natural frequency of the bridge girder could be detected by frequency analysis of the generate voltage even when subjected to the intermittent load of passing cars.