成果報告書詳細
管理番号20160000000451
タイトル*平成27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 道路橋の維持管理及び防災・減災を目的としたセンサシステムの研究開発
公開日2016/7/22
報告書年度2015 - 2015
委託先名日本電気株式会社 一般財団法人首都高速道路技術センター
プロジェクト番号P14011
部署名ロボット・AI部
和文要約
英文要約Title: The Sensor System Development Project to Solve Social Problems for Infrastructure Maintenance and Renewal.
R&D of sensor system for infrastructure condition monitoring.
R&D of sensor system for maintenance of road bridges and disaster management (FY2014-FY2016) FY2015 Annual Report

We have developed the function which improves the maintenance of the radio sensor terminal. The radio sensor terminal is able to receive parameters and firmware updates from the gateway via a radio network of 920MHz band. We have developed displacement sensor using the inductance change detection method. The displacement sensor can detect displacement between -50mm and +50mm with 28bit resolution, and output it as digital data. We added interface to the radio sensor terminal to connect the displacement sensor. The displaced data detected by the displacement sensor is sent by a radio sensor terminal to a gateway via a radio network of 920MHz band. We designed equipment composition of the self-power generation equipment which supplies the electric power to a radio sensor terminal. We reached the conclusion that it can be composed by energy harvesting, a battery charging and discharging controller and a charge conductor. We chose photovoltaic generation as energy harvesting and chose a Lithium Ion Capacitor (LIC) as a charge conductor. We miniaturized outer case of a radio sensor terminal to the size of height 2.6cm x width 10cm x depth 4.8cm.
When an earthquake occurs, the radio sensor terminal we designed collects data automatically. We designed the method to reduce the amount of data in the radio communication by a data compression function. We discussed the approaches of adding functions to the remote server. We adopted the method for applications to utilize APIs of the remote server. We setup a radio sensor terminal and a gateway in a road bridge and evaluated them. The radio sensor system we have developed worked successfully in a field, and the necessary data was sent successfully to the remote server.
The highway bridges which should be the target for applying the radio sensor system were discussed. Influences of the typical damage including damage on main girders, cracks of RC slabs and damage of bearing supports on the performance of the bridges were investigated. Techniques for detecting the typical damage were discussed and a procedure for abnormal detection was developed. The specifications and accuracies of vibration sensors and contact type displacement sensors with different manufacturers were evaluated. Finally, the power consumption of the sensor terminal was investigated with the purpose for discussing the supply of electric power.
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