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Towards Low-Cost Structural Health Monitoring with Sensor Networks in Earthquake Damage Detection

T. FUJIWARA, H. S. ULUSOY, M. Q. FENG

Abstract


Damage assessment in structural health monitoring (SHM) requires accurate acceleration data collected in real time. The recording systems for earthquake acceleration usually collect data at a sampling rate of 200 sps (samplings per sec) or higher in high resolution and high sensitivity using expensive devices. Wireless sensor network (WSN), on the other hand, has a potential capability to monitor damage conditions in a disaster by low cost. However, WSN would be faced with difficulty in collecting data at a high sampling rate due to restricted CPU power with batteries. This paper presents an acceptable reduction scheme of the sampling rate, and discusses effectiveness of WSN for SHM. We analyzed the acceleration data of the previous earthquake by cumulative distribution function (CDF) in the frequency domain.

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