图像测量技术在海洋工程管线振动模型实验中的应用研究

Study on tube vibration experiment of ocean engineering based on image measurement technology

针对海洋工程模型实验中传统外置式传感器对管线模型测量的影响问题,提出了一种标记式轻质管线的图像测量方法:首先进行特征设置与定位,然后分别进行匹配追踪与立体匹配,之后根据匹配结果进行三维重构。由于此方法基于立体视觉重构原理,通过实时追踪管线上的特征标记来获取管线的三维运动轨迹,所以不仅灵敏度高,而且对管线的运动无扰动。最后通过管线的涡激振动实验进行方法验证。实验结果表明,该方法可以较好地重构出流场中管线的三维运动,大幅度提高了海洋工程管线振动模型实验的效率。

Research on tube motion measurement is very important for the design of tube on ocean engineering.However,disturbances often occur because of the presence of sensors,especially in some small-scale experiments.To solve this problem,a new image processing method for tube motion analysis is presented here.First,some cycle signs are drawn on the tube and are posited by shape recognition.Second,region matching method is adopted to select corresponding points on images with different view and to track position changes at different time.Next,according to the image matching results,the three-dimensional coordination is rebuilt by stereo vision theory.Through the optical processing technology,the proposed method can achieve untouched measurement for tube.Finally,the performance of the proposed method has been evaluated using vortex-induced vibration experiment in a glass flume.The results show that the proposed method for studying the tube motion is effective and robust.