缠绕式提升机钢丝绳横向空间振动的视觉测量方法与试验研究

Visual Measurement Method and Experimental Research of Transverse Spatial Vibrations of Rope in Winding Hoist

针对缠绕式提升机悬绳段钢丝绳横向空间振动开展测量方法研究,采用双高速摄像机采集悬绳空间横振的灰度图像,在设置感兴趣区域的基础上,采用自适应阈值设定的小波边缘提取算法,提高钢丝绳轮廓的检测精度,并进行二值化处理,通过矩阵求形心法得到区域内钢丝绳形心位置,并采用经验模态分解法去除钢丝绳排绳位移引起的周期性激励,从而得到了钢丝绳横向空间振动信号。为验证测量方法的正确性,在多绳缠绕式提升系统试验平台上开展试验研究,试验结果表明,研究的视觉检测方法能够快速、准确地实现钢丝绳横向空间振动信号的非接触检测。

The method of measuring the transverse spatial vibration of wire rope in catenary section of winding hoist is studied,the gray image of that is captured by two high-speed cameras,on the basis of setting region of interest,a wavelet edge extraction algorithm based on adaptive threshold is adopted to improve detection accuracy of wire rope contour and then binarization is conducted,centroid position of rope is obtained by calculating matrix,the empirical mode decomposition method is used to remove the periodic excitation which is caused by the displacement of the wire rope,and then getting the transverse spatial vibration signal of the catenary.In order to verify the correctness of the measurement method,the experimental research is tested on the test platform of multi-rope winding hoisting system.Test results show that the proposed visual measurement method of rope vibration can quickly and accurately realize the non-contact measurement of the transverse spatial vibration signal of the wire rope.