成果報告書詳細
管理番号20150000000598
タイトル*平成26年度中間年報 インフラ維持管理・更新等の社会課題対応システム開発プロジェクト インフラ状態モニタリング用センサシステム開発 ライフラインコアモニタリングシステムの研究開発
公開日2016/1/27
報告書年度2014 - 2014
委託先名一般財団法人マイクロマシンセンター 国立研究開発法人産業技術総合研究所 明星電気株式会社 沖電気工業株式会社 高砂熱学工業株式会社
プロジェクト番号P14011
部署名ロボット・機械システム部
和文要約
英文要約Title: Development of Utility Infrastructure Core Monitoring System (FY2014-FY2016) FY2014 Annual Report

1-(1). Development of devices for vibration sensing and energy harvesting: The purpose of the study is to develop a pump monitoring system using vibration energy harvesters integrated with an ultra-low power circuit, referred to as the “Shishiodoshi” circuit. The system can detect vibration peaks with 1/100 of power consumption. It has been found that the pumps vibrate at 30Hz-0.5m/s2 through the development of 1-(5). We have estimated that the power consumption of the “Shishiodoshi” circuit can be decreased to 2V-0.68µW. Through MEMS techniques, we have fabricated the energy harvesters using AlN thin films. And its generated power has been measured to be 0.4V - 0.041uW. 1-(2). Development of a wafer-level packaging technology for piezoelectric devices: The purpose is to develop pump monitoring device using thin film AlN cantilevers. We have developed all dry process for thin film AlN cantilevers to realize production process from a prototype to mass production. We found that the AlN films on the prototype cantilever has the piezoelectric constant d31 of 1.14 pm/V. 1-(3). Development of a vibration sensor nodes: The purpose is to develop vibration sensor nodes that work at very low vibration-generated power. A prototype of sensor node equipped with a wireless communication module, vibration sensor, and power generator has been developed. The sensor node with the “matchbox” size, composing of three PCBs, has the functions of measurement of temperature, detection of seismic vibration, and transmission of these data. 1-(4). Development of a wireless sensor network system operating on ultra-low power consumption: The purpose is to develop wireless multi-hop network protocol stacks for the pump monitoring system and the management system of the wireless sensor nodes. It is necessary to determine whether the power-saving multi-hop network can be realized. We have developed the highly accurate time-synchronous power saving communication method by adding clock skew error correction function to the existing method. Also, we have implemented the method to a debug board in order to reveal optimized parameters of the method. As a result, it has become clear that the synchronization performance is not change even if the reception period is changed from 100msec to 2msec. 1-(5). Development of a core monitoring system: An emulator for the “Shishiodoshi” circuit and the data filtering function have been developed. The emulator is a development tool for making of pseudo data of a sensor device. The data filtering function has been developed as a preprocessing step and to raise the accuracy for fault detection in the pump.
2. Construction and demonstration experiment of the core monitoring system: We have started collecting data of vibration generated by a vertical pump in the hospital. Due to the result of our data analysis, the location suitable for monitoring the vertical pump was specified.
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