采用普通摄像机的斜拉索振动位移非接触测量方法

大幅度非线性的斜拉索振动的发生难于预测,不利于测试仪器的现场布置,因此手机、DV等普通摄像机对于拉索振动的测试更加方便实用。为了及时准确地测量斜拉索振动,将视频采集和数据分析分开,利用普通摄像机进行了斜拉索非接触式振动位移测试方法的研究和测试系统的开发。所开发的斜拉索振动位移测试系统既可以实现单标识点的位移测试,也可以实现多标识点和无标识点的振动位移测试。通过室内模型试验结果验证了测试方法的正确性和测试结果的精确性,同时进行实桥的现场测试并验证了采用普通摄像机进行实桥测试方法的可靠性,测试结果满足实桥斜拉索动位移测量要求。

Non-contact measurement method on stay cable dynamic displacement based on normal camera

The occurrence of large amplitude nonlinear cable vibration is difficult to predict, which is not conducive to the field layout of testing instruments. Therefore, the ordinary cameras, such as mobile phone and DV, are more convenient and practical for cable vibration testing. In order to measure the vibration of the stay-cable timely and accurately, the video recording and the data analysis were separated, and the non-contact vibration displacement testing method of the cable was studied and the testing system was developed, using the ordinary camera. The correctness and the reliability of the testing method were verified by indoor model test and field bridge test. The indoor model test results verify the correctness of the method and the accuracy of the test results. The vibration displacement testing system for the stay-cable can realize the displacement testing for single target, multiple targets and non-marked targets, and the test results can meet the accuracy requirements. The results of the field bridge test verify the reliability of the method for field bridge test using the ordinary camera, and the test results meet the field bridge test accuracy requirements.