关键词: 振动与波, 数字视频, 边缘检测, 简支梁模型, 模态参数, 振动测试

Abstract: 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.

Key words: vibration and wave, digital video, edge detection, simply supported beam model, modal parameter, vibration testing