基于视频测量的运行状态模态分析
发布时间：2018-07-28 08:16
【摘要】：视频测量技术通过摄像机记录被测结构的振动过程,采用图像处理方法实现对结构上测点的多目标跟踪,具备全场非接触、测试过程简便、测量精度高等突出优点。基于摄像机成像模型,采用光束法平差提取出结构测点三维方向位移振动信息,每个测点等效于一个三轴"微位移传感器",对多测点目标跟踪可视为多通道同步数据采集。对摄像机成像系统进行校准,依照结构形状特性分布测点,由结构静止时各测点的空间位置构建出测试结构的几何模型,进行视频采集和多目标跟踪获取各测点动态响应数据,采用运行状态模态分析方法,识别出被测结构的固有模态参数。基于视频测量实现了测试结构几何建模和信号采集,并与模态分析软件紧密结合,形成了完整的视频采集与分析系统,具备良好的空间域展现能力,特别适用于柔性低频结构的动态测试与分析。以轻质风扇叶片、若干树叶等结构为对象进行实验研究,验证了该技术和方法的有效性。
[Abstract]:The video measurement technology records the vibration process of the structure measured by video camera, and uses the image processing method to realize the multi-target tracking of the measuring points on the structure. It has the outstanding advantages of full-field non-contact, simple test process and high measurement precision. Based on the camera imaging model, the three-dimensional directional displacement vibration information of structural measuring points is extracted by beam method adjustment. Each measuring point is equivalent to a three-axis "micro-displacement sensor", and tracking multi-point target can be regarded as multi-channel synchronous data acquisition. The camera imaging system is calibrated, the measuring points are distributed according to the shape characteristics of the structure, the geometric model of the test structure is constructed from the spatial position of each measuring point when the structure is still, and the dynamic response data of each measuring point are obtained by video capture and multi-target tracking. The inherent modal parameters of the tested structure are identified by using the running state modal analysis method. Based on video measurement, geometric modeling and signal acquisition of test structure are realized, and combined with modal analysis software, a complete video acquisition and analysis system is formed, which has a good display ability in spatial domain. It is especially suitable for dynamic testing and analysis of flexible low frequency structures. The effectiveness of the technique and method is verified by the experimental study of light fan blades and some leaf structures.
【作者单位】： 南京航空航天大学机械结构力学及控制国家重点实验室;
【基金】：航空科学基金(20161352011)
【分类号】：TP391.41
[Abstract]:The video measurement technology records the vibration process of the structure measured by video camera, and uses the image processing method to realize the multi-target tracking of the measuring points on the structure. It has the outstanding advantages of full-field non-contact, simple test process and high measurement precision. Based on the camera imaging model, the three-dimensional directional displacement vibration information of structural measuring points is extracted by beam method adjustment. Each measuring point is equivalent to a three-axis "micro-displacement sensor", and tracking multi-point target can be regarded as multi-channel synchronous data acquisition. The camera imaging system is calibrated, the measuring points are distributed according to the shape characteristics of the structure, the geometric model of the test structure is constructed from the spatial position of each measuring point when the structure is still, and the dynamic response data of each measuring point are obtained by video capture and multi-target tracking. The inherent modal parameters of the tested structure are identified by using the running state modal analysis method. Based on video measurement, geometric modeling and signal acquisition of test structure are realized, and combined with modal analysis software, a complete video acquisition and analysis system is formed, which has a good display ability in spatial domain. It is especially suitable for dynamic testing and analysis of flexible low frequency structures. The effectiveness of the technique and method is verified by the experimental study of light fan blades and some leaf structures.
【作者单位】： 南京航空航天大学机械结构力学及控制国家重点实验室;
【基金】：航空科学基金(20161352011)
【分类号】：TP391.41
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