利用数字图像边缘检测识别梁的模态参数  

IDENTIFICATION OF BEAM MODAL PARAMETERS BY DIGITAL IMAGE EDGE DETECTION

作　　者：王爱云 胡朝辉 

机构地区：[1]广东技术师范学院天河学院,广州510540 [2]广州诚安路桥检测有限公司,广州510420

出　　处：《低温建筑技术》2012年第4期54-56,共3页Low Temperature Architecture Technology

摘　　要：基于数字图像边缘检测技术,对附集中质量的某梁模型进行振动测试,以普通数码摄像头与PC机作为视频采集设备,实时获取梁的振动图像,运用三次多项式拟合实现边缘的亚像素定位,以获取梁振动的位移时程曲线,后处理采用模态分析识别梁的模态参数,试验表明采用该方法进行低频结构的模态试验是可行的。Based on digital image edge detection technology,the vibration testing of the simply supported beam model suspended with concentrated masses is identified in this paper,the real-time vibration images of beam is obtained by the general digital camera and PC as its hardware,meanwhile,uses cubic polynomial to fit the edges to realize sub-pixel localization,displacement-time curve of beam with vibration is obtained.In the post-processing,the modal parameter of simply supported beam model is identified by the modal analysis.The testing results show that achieving the modal test of low-frequency structures by the method of this testing system is feasible.

关 键 词：数字图像 边缘检测 多项式拟合 亚像素 模态参数 

分 类 号：TU311.3[建筑科学—结构工程]