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Study on Video Image Testing Technique in Vibration Test
HU Zhao-hui;YUAN Xiang-rong;LIU Min
2011, 31 (3):
162-165.
DOI: 10.3969/j.issn.1006-1355-2011.03.038
Based on digital video technology, video image vibration measuring system is designed with the general USB digital camera and PC as its hardware. Meanwhile, the first-order modal parameters of a simply supported beam with concentrated masses applied are identified. Vibration video acquisition and image edge detection procedures are programmed in the MATLAB environment. The displacement-time curve of the beam vibration is obtained. Modal analysis is applied to determine the natural frequencies, the damping ratio and the vibration modes of the simply supported beam. The testing results show that this testing system is feasible for realization of the vibration test for low-frequency structures.
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