Distributed Processing for Operational Modal Analysis of Bridge Infrastructures Using Wireless Sensor Networks

Dzulqarnain, A.R. (2017) Distributed Processing for Operational Modal Analysis of Bridge Infrastructures Using Wireless Sensor Networks.

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Abstract:In a large structure such as bridge, where only operational vibration response data can be used, so-called operational modal analysis (OMA) are used to estimate the modal parameters from structural vibration. Due to the need of easier installation and maintenance, wireless sensor network is increasingly used in continuous OMA of structural health monitoring. However, understanding the large amount of vibration data produced from structural vibration and energy constraint of wireless sensor node, it is preferable to perform as much as possible OMA processes locally on sensor node such that it only transmits meaningful or transformed data. Based on this, an automatic distributed OMA based on Frequency Domain Decomposition (FDD) is proposed. The FDD is applied to a set of small areas surrounding natural frequencies instead of full frequency range. By performing FFT operation locally on sensor node, only reduced FFT result, correlated to the selected areas, are transmitted. Experiment on three real bridges shows that the method reliably detects correct modal parameters and reduce the transmitted data size into 1.27 percent of its time-domain vibration signal data size. The practical feasibility review also shows that implementation on wireless sensor node requires minimum amount of RAM, processing power, and energy consumption.
Item Type:Essay (Master)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:52 mechanical engineering, 54 computer science
Programme:Embedded Systems MSc (60331)
Link to this item:http://purl.utwente.nl/essays/73202
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