All structures vibrate continuously with very small amplitudes of motion. These vibrations cannot be detected by human but can be well captured when sensitive sensors are used. If enough number of sensors are placed correctly on the structure, dynamic vibration properties of that structure can be detected. These properties are useful to calibrate numerical computer simulations especially in cases when destructive material tests are not possible. Use of OMA in historical masonry structures, for example, has proven to be very useful. Senso Engineering has completed a number of projects on that topic, providing critical information to engineering offices for calibrating their FE models before starting actual analyses.
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