摘要
本文将时间平均成像方法用于振动物体上任意点的面内振幅测量。采用该方法只需用普通的ＣＣＤ摄像机分别摄取被测物体上某点附近微区在静态和谐波振动状态下的时间平均成像即可求得该点的振幅。为求解该问题所导出的非线性方程，本文构造了基于图像相关的迭代算法。为提高图像分析精度，本文还采用了双线性插值将原始的数字图像转变为连续图像。实验表明该测量方法具有较高的精度和工程可用性，且对实验设备和测量环境要求不高，很适合现场非接触测量。
In this paper a new image processing method was developed to determine the inplane vibration amplitude of a harmonically oscillating object from its two images. These imageswere captured with a CCD camera, the first image was recorded when the object was in staticstate and the second image was a time-average image recorded when the body was in vibration.An iterative algorithm based upon digital-image correlation was also presented to solve thederived nonlinear equations.In order to get a higher accuracy a bilinear interpolation was used totransform the original discrete images into continuous images. Experimental results show that themethod can be used to determine amplitudes of harmonic vibrations with reasonable accuracy.Besides, this method has trivial requests for picturing equipments and experimental environmentand is especially suitable for field measurement.
出处
《工程力学》
EI
CSCD
北大核心
1999年第6期107-112, ,共6页
Engineering Mechanics
