In a recent development, Dacheng Construction Group of Japan has unveiled a groundbreaking building structure monitoring system in collaboration with Yokogawa, Nagano Japan Wireless Co., Ltd., and the University of Tokyo. This innovative system integrates high-precision MEMS (Micro Electro Mechanical Systems) sensors with 920 MHz wireless technology to enable long-term structural stability monitoring. The project was part of a government-sponsored initiative by NEDO, aimed at improving infrastructure maintenance and renewal through advanced technological solutions.
The newly developed MEMS sensors offer exceptional accuracy, with a vibration sensor resolution of 1 mgal (where 1 gal equals 1 cm/s²) and a strain sensor capable of detecting deformations as small as 1 nm. These features allow for precise measurement of even the slightest changes in a building's structure over extended periods. This level of sensitivity is a significant improvement over traditional sensors, which often require more frequent maintenance and calibration.
Data collected by the MEMS sensors is transmitted wirelessly via the 920 MHz band, ensuring reliable communication even within complex building structures. The data is then gathered by a receiving device on each floor and sent to a diagnostic computer for analysis. This wireless setup minimizes the need for extensive wiring, making installation more efficient and cost-effective.
To further enhance the system’s usability, especially in areas without a power supply, an independent power unit is currently under development. This will make the system suitable for a wider range of applications, including remote or hard-to-reach locations.
On the diagnostic side, the system uses a specialized software called "T-ia lert Structure" to assess the structural integrity of buildings. It evaluates key parameters such as natural frequency, distortion, and tilt angle. In the event of an earthquake with a magnitude of 3 or higher, the system can quickly detect vibrations and perform a detailed analysis to identify any potential damage. If abnormalities are detected, it can also help pinpoint secondary injury sites, allowing for faster and more targeted repairs.
Dacheng Construction Group plans to test the system in existing buildings and civil engineering structures starting in 2018. Based on the results, they aim to develop comprehensive Business Continuity Plan (BCP) measures. By April 2019, the company hopes to fully deploy the system across its projects, marking a major step forward in the field of smart infrastructure monitoring.
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