基于小波的管道凹痕评估去噪方法

IF 4.4 2区 工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS
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引用次数: 0

摘要

在实践中,通常会对埋地钢制油气管道中的凹痕进行基于应变的评估。从卡尺检测工具中获得的凹痕信号含有噪声,会对应变估算的准确性产生很大影响。本文针对凹痕信号提出了一种基于小波的新型去噪方法,该方法以过完全展开为基础,并使用静态和双曲小波变换构建了相应的字典。所提出的方法基于对受压头作用的管段进行弹塑性有限元分析时产生的无噪声和噪声凹痕信号进行了验证,结果表明,就均方根误差和从去噪信号估算有效凹痕应变的准确性而言,该方法比常用的基于小波变换的硬阈值和软阈值方法更有效。该方法进一步用于对 42 个在役管道的真实凹痕信号进行去噪,以说明其在促进基于应变的凹痕评估方面的有效性和潜在的实际应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A wavelet-based denoising method for pipeline dent assessments

Strain-based assessments of dents in buried steel oil and gas pipelines are commonly carried out in practice. Dent signals obtained from the caliper inspection tool contain noises that can have a large impact on the accuracy of the estimated strain. This paper proposes a novel wavelet-based denoising method for dent signals based on the overcomplete expansion with the corresponding dictionary constructed using the stationary and hyperbolic wavelet transforms. The proposed method is validated based on noise-free and noisy dent signals generated from elasto-plastic finite element analyses of a pipe segment subjected to an indenter and shown to be more effective than the commonly used wavelet transform-based hard- and soft-thresholding methods in terms of the root mean square error and the accuracy of the effective dent strain estimated from the denoised signal. The proposed method is further employed to denoise 42 real dent signals from in-service pipelines to illustrate its effectiveness and potential practical application to facilitate strain-based dent assessments.

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来源期刊
Computers & Structures
Computers & Structures 工程技术-工程:土木
CiteScore
8.80
自引率
6.40%
发文量
122
审稿时长
33 days
期刊介绍: Computers & Structures publishes advances in the development and use of computational methods for the solution of problems in engineering and the sciences. The range of appropriate contributions is wide, and includes papers on establishing appropriate mathematical models and their numerical solution in all areas of mechanics. The journal also includes articles that present a substantial review of a field in the topics of the journal.
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