Vibration Based Structural Health Monitoring Using Large Sensor Arrays: Overview of Instrumentation and Feature Extraction Based on Modal Filters

Vibration based Structural Health Monitoring (SHM) techniques are based on the measurement of vibration signals on structures. The first part of this chapter is dedicated to an overview of the existing sensors and acquisition units which are available for such measurements, with an emphasis on recent advances in this area. With these recent advances in sensors and instrumentation, structures can be equipped with very large sensor arrays which monitor the vibration in real time. The difficulty is to be able to extract meaningful information from the huge amount of data generated by these large arrays. The second part of the chapter presents a data reduction technique based on modal filters. It is shown how features can be extracted from the output of these filters and subsequently used for damage detection.

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