散斑图像相关数字技术在海洋平台结构模型振动位移测量中的应用

Application of a digital speckle image correlation technique to vibration displacement measurement of an offshore platform model

采用散斑图像相关数字技术以非接触方式对正弦波和地震波作用下的海洋平台结构模型振动位移进行了监测,并对测量结果进行了频谱分析,同时还与传统位移传感器测得的结果做了对比分析。试验结果与分析表明该方法具有较高的精度和工程可用性,且对试验设备和测量环境要求不高,很适合现场非接触测量。

In this paper a digital technique of speckle image correlation is introduced in monitoring vibration displacement of an offshore platform model. And spectrum analysis of measuring results is carried out. The results are compared to those measured by traditional displacement sensor at the same time. Experimental results and analysis are shown that the method can be used to determine vibration displacement with reasonable accuracy. Besides, this method is requested ordinarily for testing equipments and experimental environment, and is especially suitable for field measurement.