B35 圧電振動発電で駆動する振動状態監視装置の開発に関する研究(M-OS3-1 制御/センシング,M-OS3 スマート構造システム,「海を越え,国を越え,世代を超えて!」)

Abstract

In this study, we have developed a sensor prototype for vibration acceleration monitoring driven by the authors' proposed vibration energy harvester. It uses a commercial LTC3588 energy harvesting chip with capacitors and the piezo-bimorph cantilever-type energy harvester consists of the surface bonded two Macro-Fiber Composites. The power consumption of the acceleration sensor was typically 1[mW], and the driving current was typically 0.4[mA]. For vibration condition monitoring applications of industrial rotating machinery, we assumed that the typical casing or pedestal vibration amplitude of the rotating machinery was 0.71[mm/s] (RMS) according to ISO standard. This low intensity excitation condition was the input for experimental evaluation of the developed sensor prototype. The sensor prototype was able to measure the vibration acceleration of approximately 17[s] under the vibration input of 0.026[G] (RMS) at approximately 56[Hz] every two minutes. Approximately 12% of the input of vibration energy was used for driving the acceleration sensor. Therefore, estimated overall energy transfer efficiency was about 12%. The experimental results indicate the feasibility of the sensor prototype driven by piezocomposite vibration energy harvester.