研究目的
To develop a Fiber Bragg Grating Vibration Sensor (FBGVS) based Landslide Early Warning System (LEWS) that can acquire seismic vibrations for early prediction of landslides.
研究成果
The developed FBGVS, with its novel cantilever design enhancing strain sensitivity through combined axial and torsional strain, effectively acquires seismic vibrations as demonstrated in calibration and experimental trials. It shows linear responses to varying amplitudes and frequencies within the 2-25 Hz range. The sensor can be deployed in landslide-prone areas for real-time monitoring, and when integrated with a broadcast methodology like GSM, it can form an effective LEWS to provide early warnings and reduce false alarms. Future work should involve field deployment to assess real-time performance and further refine the threshold for seismic vibrations.
研究不足
The experimental trials are conducted in a laboratory setting with simulated seismic vibrations using an iron ball drop, which may not fully replicate real-world landslide conditions. The sensor's performance in actual field deployments with varying environmental factors is not tested, and the range of frequencies and amplitudes used in calibration might not cover all possible seismic events. Additionally, the integration with an IoT system for warning dissemination is proposed but not implemented or tested in this study.
1：Experimental Design and Method Selection:
The study employs an inertial sensing technique using a cantilever-based system with a specially designed cantilever to enhance strain sensitivity. The methodology includes calibration and experimental trials to evaluate the sensor's performance in acquiring seismic vibrations.
2：Sample Selection and Data Sources:
A solid iron ball dropped from varying heights (0.25m, 0.5m, 0.75m, 1m) is used as a seismic excitation source to simulate vibrations. The FBGVS is positioned 1m away from the source to acquire data.
3：25m, 5m, 75m, 1m) is used as a seismic excitation source to simulate vibrations. The FBGVS is positioned 1m away from the source to acquire data.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes a commercial shaker table (LDS V406 Permanent magnet shaker) for calibration, a plastic sheet material of thickness 0.3mm for the cantilever, an FBG sensor, and a proof mass of 25g. Materials also include an iron ball for seismic excitation.
4：3mm for the cantilever, an FBG sensor, and a proof mass of 25g. Materials also include an iron ball for seismic excitation.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: For calibration, the FBGVS is mounted on the shaker table and subjected to vibrations of varying amplitudes (1mm, 2mm, 3mm) at 5Hz frequency, and varying frequencies (2Hz, 10Hz, 20Hz) at 2mm amplitude. For experimental trials, the iron ball is dropped from different heights, and the FBGVS response is recorded. Data is acquired in real-time.
5：Data Analysis Methods:
The peak-to-peak strain variation is measured and compared with shaker table data. Sensitivity is calculated as the ratio of peak strain variation to peak acceleration. Linear relationships are analyzed for amplitude and frequency responses.
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