Measurement of Structural Vibration through Video Images
نویسندگان
چکیده
Structural mechanical vibration is commonly measured through punctual sensors, i.e. sensors that measure the structural behavior at only one point. Examples of such sensors are accelerometers, LVDTs, non-scanning laser vibrometers, and proximity probes. This project aims at developing an acquisition system able to measure the dynamic behavior of a structure as a whole (many points) using only one sensor: a video camera. After video image acquisition, the vibration at specific points of interest in the structure is obtained by computer post processing, adopting image processing techniques. Experimental results show the feasibility of measuring unidirectional vibration with a 30 fps camera, resulting in good amplitude resolution when compared to proximity probe measurements. Due to the camera sample rate, direct measurement of vibration is limited in frequency. For this reason, a faster video camera was used to measure orbits in a rotating system, thus achieving good experimental results in two directions of movement. In general, acquisition rate and exposure time of the camera have shown to be critical parameters to achieve good quality measurements of vibration.
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تاریخ انتشار 2011