基于机器视觉的大柔性结构振动位移测量
发布时间：2018-10-22 08:47
【摘要】：针对空间大柔性结构受到扰动后所产生的低频率、大幅值振动变形难以测量的问题,利用基于机器视觉的结构振动位移测量方法对此类结构的振动位移进行了测量,并识别了结构的动态特性。首先,理论分析了传统的对加速度信号直接积分获得位移的方法存在低频噪声被放大的问题并进行了实验论证;然后,研究了基于机器视觉的结构振动位移测量方法,进行了方法精确度与有效性的实验验证。实验中采用数码相机作为视觉传感器,对采集的结构振动视频进行图像处理,采用数字图像相关方法提取每帧图像特征点的位置信息,应用亚像素定位方法改进测量精度。将视觉位移测量方法获得的结构固有频率与加速度数据求得的结构固有频率进行比较,验证了基于机器视觉的振动位移测量方法在大柔性结构振动位移测量和动态特性识别方面的应用有效性。
[Abstract]:Aiming at the problem that the vibration deformation of large flexible space structure is difficult to measure because of its low frequency and large amplitude vibration deformation, the vibration displacement measurement method based on machine vision is used to measure the vibration displacement of this kind of structure. The dynamic characteristics of the structure are identified. Firstly, the problem of low frequency noise amplification in the traditional method of direct integration of acceleration signal to obtain displacement is analyzed theoretically, and then the method of measuring displacement of structure vibration based on machine vision is studied. The accuracy and validity of the method are verified by experiments. In the experiment, the digital camera is used as the visual sensor, the structure vibration video is processed by image processing, the position information of each image feature point is extracted by digital image correlation method, and the measurement accuracy is improved by sub-pixel positioning method. The natural frequency of the structure obtained by the visual displacement measurement method is compared with the natural frequency of the structure obtained by the acceleration data. It is verified that the vibration displacement measurement method based on machine vision is effective in vibration displacement measurement and dynamic characteristic identification of large flexible structures.
【作者单位】： 西北工业大学航天学院;空军工程大学防空反导学院;
【基金】：国家自然科学基金资助项目(11372246) 西北工业大学研究生创意创新种子基金资助项目(Z2016049)
【分类号】：TP391.41;V414
本文编号：2286683
[Abstract]:Aiming at the problem that the vibration deformation of large flexible space structure is difficult to measure because of its low frequency and large amplitude vibration deformation, the vibration displacement measurement method based on machine vision is used to measure the vibration displacement of this kind of structure. The dynamic characteristics of the structure are identified. Firstly, the problem of low frequency noise amplification in the traditional method of direct integration of acceleration signal to obtain displacement is analyzed theoretically, and then the method of measuring displacement of structure vibration based on machine vision is studied. The accuracy and validity of the method are verified by experiments. In the experiment, the digital camera is used as the visual sensor, the structure vibration video is processed by image processing, the position information of each image feature point is extracted by digital image correlation method, and the measurement accuracy is improved by sub-pixel positioning method. The natural frequency of the structure obtained by the visual displacement measurement method is compared with the natural frequency of the structure obtained by the acceleration data. It is verified that the vibration displacement measurement method based on machine vision is effective in vibration displacement measurement and dynamic characteristic identification of large flexible structures.
【作者单位】： 西北工业大学航天学院;空军工程大学防空反导学院;
【基金】：国家自然科学基金资助项目(11372246) 西北工业大学研究生创意创新种子基金资助项目(Z2016049)
【分类号】：TP391.41;V414
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