構造ヘルスモニタリングへの適用を目的とした無線式加速度計測システムの開発

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タイトル別名
  • DEVELOPMENT OF WIRELESS ACCELERATION MEASUREMENT SYSTEM APPLIED TO STRUCTURAL HEALTH MONITORING
  • 構造ヘルスモニタリングへの適用を目的とした無線式加速度計測システムの開発 : 既存建物への導入に向けた検討
  • コウゾウ ヘルスモニタリング エ ノ テキヨウ オ モクテキ ト シタ ムセンシキ カソクド ケイソク システム ノ カイハツ : キソン タテモノ エ ノ ドウニュウ ニ ムケタ ケントウ
  • － Consideration for introduction to existing buildings －
  • － 既存建物への導入に向けた検討 －

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<p> Newly developed low-cost micro-electro-mechanical systems (MEMS)-based acceleration sensors exhibit enough accuracy and stability to monitor the shaking of structures caused by an earthquake and analyze damage to a facility after a powerful earthquake event. We have developed a practical shaking monitoring system using the MEMS-based acceleration sensors and a 920-MHz multi-hop radio communication method that can offer reliable radio wave communication even in large-scale facilities. An acceleration sensor unit must be installed on each floor of a building to accurately evaluate earthquake damage to an entire structure. In this kind of system, the base clock of each sensor unit must be highly synchronized to the master clock to minimize the acceleration-induced phase synchronization error. In the proposed system, such error among multiple sensor units can be limited to three milliseconds based on our patent-pending technology.</p><p> In this paper, time synchronization, measurement accuracy, and communication performance for the newly developed acceleration measurement system were studied, and the following important conclusions were obtained.</p><p> 1) In actual buildings, communication between sensors can be performed without being affected by a concrete slab with a thickness of upto approximately 640 mm when using a long distance communication antenna and about 520 mm when using a film antenna.</p><p> 2) Due to the time synchronization error among the sensors being within ±3 ms, the accuracy of time synchronization could be sufficiently secured for application to structural health monitoring.</p><p> 3) Regarding the acceleration measurement accuracy of each sensor, the measurement error was only 2.9% at the maximum compared with a commercially available acceleration sensor, and the system displayed a measurement accuracy that can be applied to structural health monitoring.</p><p> 4) As a result of conducting the demonstration test of the acceleration measurement system in a real building, it was confirmed that stable data measurement was possible.</p><p> Based on the above findings, the wireless acceleration measurement system developed can be used for buildings of various structural types such as reinforced concrete buildings, steel buildings, and high-rise buildings because inter-floor communication is possible.</p>

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