An automatic detection method for key points of steel pipe casing collar connection
A casing coupling and automatic detection technology, which is applied in the field of quality engineering, can solve the problems of outflow, oil leakage, loss, etc.
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[0064] In the following, the present invention is further described through embodiments in conjunction with the drawings, but the scope of the present invention is not limited in any way.
[0065] The present invention provides a method for detecting key points of casing coupling connection, establishes a two-stage model framework, and proposes an advanced statistical method using positive and negative sequence to detect two key interpretable change points. The method is based on the torque signal of the casing coupling connection with the sealing surface: firstly, the similarity between the torque signal and the interpretable physical basis is measured based on the dynamic time warping method. Then, in the first stage, all potential change points in the torque signal are detected based on the statistical test of the maximum value of F and the two-phase regression model. In the second stage, two more likely key change points are selected through screening of reverse change points...
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