成果報告書詳細
管理番号20150000000464
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 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2015/7/25
報告書年度2014 - 2014
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・機械システム部
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) FY2014 Annual Report

A radio sensor terminal which can connect a temperature-humidity sensor with vibration sensor was developed. The radio sensor terminal consists of the amplifier part, MCU part, the memory part and the communication part. A communication department of a radio sensor terminal uses a specific small electric power radio of 920MHz. A communication department can change the transmission electric power and the communication speed to conditions for use. A radio sensor terminal collects data of a sensor periodically. It's possible to change the sampling frequency, the collection cycle and collection time used for measurement in USB interface. The power consumption of the sensor terminal is about 0.2 W (in operation). We compared and examined photovoltaic generation, wind power generation and vibration generation of electricity as the independent generation of electricity to make a radio sensor terminal drive. A substrate radio sensor terminal has built-in, the size was miniaturized up to 5 cm x 7.2 cm x 1.2 cm. The body outside the sensor terminal considers environmental resistance and is made of the die-cast of corrosion resistance aluminum. A radio sensor terminal is designed based on IP54 as the waterproof protection against dust performance. We have developed gateway equipment for a radio sensor terminal. It's possible to accumulate collected data in a cloud system through 3G wide area radio network. OS of gateway equipment is Linux. Gateway equipment has capability of addition of the functions by Linux. The parameter of gateway equipment is changed by connecting with a PC using an Ethernet port. Data collection and a communication test were put into effect in PC box-girder bridge as a field experiment. It was confirmed that you can do data transmission of the distance of the 30m in a radio. We investigated influence to corrugated data about 2 methods of ADPCM (adaptive differential pulse code modulation) and micro-law (1 of compression technologies in the sound code standardized in ITU-T) as consideration of a data compression facility. The purpose and needs of monitoring system for highway bridges were summarized. Collaborating with the routine inspection for highway bridges, monitoring system should be built to indicate damage, to monitor propagation of damage and to indicate severe damage due to earthquake. The rule for selecting monitoring items and sensor type were summarized for different targets including the superstructure, the substructure, the support and the cable of a highway bridge. Operation of monitoring system including sampling method were studied. Required specifications for a sensor were decided considering the measuring range, measuring precision and environment condition. Planning for installation of monitoring system was also studied. We put an assumption phenomenon, the monitoring item and the sensor kind in order targeted for the superstructure, the infrastructure, the support part and the cable in a road bridge. We put it in order about an operation procedure of a bridge monitoring system and a sensor required specification for a bridge monitoring. We put it in order by the basic performance which indicates the measuring range and the precision, the function required specification which indicates the function and the quality request which indicates the reliability. We put it in order at the whole bridge, a part such as a main girder, a pier and deck slab, the support part and a special part such as bridge equipment about plot planning of a sensor and installation.
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