Pipeline corrosion grade evaluation method based on multilayer convolution sparse coding

Abstract

The invention provides a pipeline corrosion grade evaluation method based on multilayer convolution sparse coding, and the method comprises the following steps: S1, installing a first acceleration sensor and a second acceleration sensor on the outer surface of a pipeline, knocking a region of interest through a force hammer, and obtaining an impact response signal; S2, constructing a grade evaluation model based on multilayer convolution sparse coding; S3, collecting force hammer actual measurement data of a to-be-tested pipeline, and after preprocessing is conducted, taking time domain signals as a test set and inputting into the model trained in the step S2; and S4, giving a pipeline corrosion grade evaluation result according to the evaluation model based on multilayer convolution sparse coding. According to the method, multilayer convolution sparse coding is adopted as a model, effective features in multiple frequency bands are extracted by using an oscillation attenuation function, weak damage features in vibration signals under pipeline corrosion can be effectively extracted, automatic corrosion grade evaluation is completed, dependence of a traditional method on manual threshold selection is avoided, and the method is suitable for online pipeline corrosion monitoring.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing, in particular to a pipeline corrosion level evaluation method based on multi-layer convolution sparse coding. Background technique [0002] Corrosion damage of pipelines is one of the main problems faced by industries such as petroleum and construction. Pipelines will inevitably be affected by external forces and environmental changes during their service, which will cause aging problems such as corrosion and wear, and then cause accidents. Therefore, it is of great significance to carry out the research on non-destructive testing and evaluation methods of pipelines to ensure the safe and reliable service of pipelines. At present, non-destructive testing technologies for pipeline corrosion mainly include ultrasonic testing, magnetic flux leakage testing, and radiographic testing. However, the service conditions of pipelines are complex, and the above-mentioned conventional metho...

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