Abstract
All objects have deformed shapes (vibration modes) that tend to vibrate, and measuring these modes is extremely useful in structural design and failure diagnosis. Traditionally, expensive measurement equipment and many vibration sensors were commonly used to measure vibration modes, but a method that measures displacement from images (Digital Image Correlation) has made it possible to identify vibration modes with a single camera. However, the identification of high-frequency vibration modes requires a high-speed camera, which increases the cost and reduces the resolution. In this study, a low-cost and highly accurate method for identifying vibration modes and frequencies (RSES: Randomized Single Exposure Sampling) was developed by applying compressed sensing to images taken with a strobe flash and a low-speed camera. This method successfully identified vibration modes and frequencies of structures vibrating at frequencies more than 300 times the shooting speed.
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