成果報告書詳細
管理番号20150000000469
タイトル*平成26年度中間年報 SIP(戦略的イノベーション創造プログラム) インフラ維持管理・更新・マネジメント技術 点検・診断技術の実用化に向けた研究開発 高速走行型非接触レーダーによるトンネル覆工の内部欠陥点検技術と統合型診断システムの開発
公開日2015/7/18
報告書年度2014 - 2014
委託先名パシフィックコンサルタンツ株式会社
プロジェクト番号P14031
部署名ロボット・機械システム部
和文要約
英文要約Title: Cross-ministerial Strategic Innovation Promotion Program / Maintenance, Renewal and Management for Infrastructure / Study on Practical Use of Inspection and Diagnostics Technique / Development of Internal Defect Inspection for Tunnel Lining using High-speed Mobile-type Non-contact Radar and Integrated Soundness Assessment Systems (FY2014-FY2016) FY2014 Annual Report

1. Outline: The purpose of this study is to develop an inspection technology detecting the defects in concrete using rapidly scannable non-contact radar as a complement of hammering test. Further expecting ultimate purpose is to develop a synthetic diagnosis system to assess the soundness comprehensively as well as a database compilation of various unsoundness conditions including inner defects by a 3D visualizing technology.
2. Surveillance on radar antennas: The surveillance on antennas was carried out in 5 domestic companies and 5 overseas companies. GSSI has been finally chosen as a company that may supply the antenna meeting our requirements most. As the inquiries showed us that the antenna usable in condition of non-contact and rapid scanning with 3m apart from the surface is not available in market, the new antenna has been set on development by ourselves.
3. Fundamental experiment: Basic experiment was carried out in a test field, where some artificial defects were set inside. The purpose of the experiment was to clarify the basic capability, detective depth and range, of non-contact radar. Three experimental parameters, the scales of inner defects, buried depths and the distance from antenna to target, were varied. A non-contact type of horn antenna has been found rather promising to detect inner defects. However, the antenna is not capable enough to provide us fully satisfied results if it is used with 3m apart from the target surface. We recognized the need for further improvement aiming at better resolution and steeper directivity. Thus, we launched a plan of innovative development, which includes synthetic aperture processing by software.
4. Development of algorithm for joint recognition by laser: It has been found possible to recognize joints from the images displayed with brightness of laser observed point clouds data. It is desirable to recognize joints directly from laser observed raw data. By adjusting the brightness and erasing dots under threshold only joints leave on the image. The need for filtering process using linearity and equal distance of joints remained as problem to be resolved.
5. Location justification of radar survey results: MIMM-R records position and posture of the vehicle by GPS, IMU and odometry respectively. Images, vehicle locations, laser and radar data are commonly controlled on GPS time. By properly linking radar survey results and the positioning information of these methods on GPS time, the radar survey results are justified on the proper located coordinates.
6. Summary: The purpose of this year was to carry out fundamental experiments and to develop the technology synchronizing positioning information. It has been accomplished as reported above. The purpose of next year is to attain the development objective of inner defects inspection through improvement of the radar system which includes proof of practical use and also to develop a 3D visualizing software.
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