成果報告書詳細
管理番号20150000000511
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 高信頼性センサによるインフラモニタリングシステムの研究開発
公開日2015/7/25
報告書年度2014 - 2014
委託先名横河電機株式会社
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: System development projects for social problem such as the infrastructure maintenance and update. Sensor system development for infrastructure state monitoring. Research and development of the infrastructure monitoring system with the high reliability sensors.

The specification outline of structural health monitoring system was decided. According to the specification, the design and verification below were implemented.
- Accelerometer design, fabrication and verification
- Evaluation of strain gauge attachment methods
- Specification development of communication module and power supply
- Validation of analytical software to calculate Seismic intensity from accelerometer output
In the development of accelerometer by using high reliability and high sensitivity silicon resonator, the accelerometer (or inclinometer) was designed and fabricated. The operation was demonstrated by applying the inclination, or gravity, to the accelerometer. It showed that the basic principle of the resonant accelerometer was validated. Moreover, in a joint development on a load slope inclinometer with NMEMS technology research organization, the primary sample with virtual digital output was delivered to the NMES technology research organization.
In the development of high reliability strain gauge sensor, the attachment methods of strain gauge were evaluated and compared, such as inorganic adhesives, organic adhesive and welding. The comparative experiments of the stress-strain characteristics and temperature cycle was evaluated. The results indicated that the welding is the most stable for structural health monitoring.
In the development of the wireless-communications module, the wireless data transmission time, electricity consumption in the sensor node and the electric wave propagation properties, which are relate to the basic design of the sensor system, were investigated for three frequency bands (400MHz, 920MHz, and 2.4GHz). As a comprehensive result, it was confirmed that 920MHz band was superior to the other bands.
In the development of the self-supporting power supply module for sensors, power generation elements and rechargeable batteries suitable for collectable energy in the installation environment were investigated. The evaluations of power generation ability of the prototype were also carried out. As the results, it was found that the pure lead battery is suitable for the outdoor use, and Li-ion battery is suitable for indoor use. Evaluation of batteries varying in the storage capacity from several companies was currently underway.
In the development of the data acquisition system, the basic functional requirement was organized for the structural health monitoring system, and the specifications development was carried out. The software functional arraignment was decided for two system requirements; continual measurement hourly and triggered measurement on disturbance (an earthquake, a typhoon, and an environmental vibration). The triggered measurement is started by three different signals, low-cost accelerometer built in sensor node, continuum measurement accelerometer with cabled power supply, the Earthquake Early Warning.
In the development of a data analysis system, requirements for a sensor node and a self-supporting power supply are summarized. A waveform processing program was validated through frequency characteristics and seismic intensity analysis by using the data of the maximum seismic intensity in each year from 2011 through 2014 provided by the Meteorological Agency, and the validity of the program was confirmed.
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