| Summary: | 博士 === 國立交通大學 === 機械工程系所 === 105 === In the dissertation, I study a three-axis piezoelectric-based vibrational energy harvester and a magnetic-force-based magnetic sensor, which use smart material-structures capable of conducting mechanical-piezoelectric-magnetic multiple conversion. For vibrational energy harvesting, when x-axis (or y-axis) or z-axis ambient vibrations are applied to the energy harvester, the energy harvester uses the smart material-structure with the piezoelectric effect to convert these vibrations to piezoelectric voltage outputs. Results show that under any of the three-axis vibrations, our modeled, finite-element analyzed (FEA), and experimental voltage outputs are in consist (this indicates either modeling or FEA can accurately predict experimental results). That is, our harvester can successfully harvest three-axis ambient vibrations. For magnetic-field sensing, the magnetic sensor uses the smart material-structure to convert x-axis (or y-axis) and z-axis magnetic fields to piezoelectric voltage outputs. Results show that under any of the three-axis AC and DC magnetic fields, the magnetic sensor can produce corresponding experimental voltage-outputs with decent sensitivities. This indicates the magnetic sensor is able to successfully sense three-axis magnetic fields. Moreover, due to the smart material-structure with the piezoelectric effect, the magnetic sensor is capable of harnessing three-axis ambient vibrations. In conclusion, according to above features and advantages, our energy harvester and magnetic sensor will be one of core technologies for developing three-axis energy harvesters and AC/DC magnetic sensors in the future, especially for certain industrial applications (e.g., smart vehicle-monitoring, process-monitoring, security-monitoring systems, etc).
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