核电站指套管磨损缺陷的扫频涡流检测及创新型特征提取

doi:10.3969/j.issn.1004-132X.2021.01.003

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Abstract To avoid reactor coolant leakage because of abrasion defects of thimble tubes in nuclear power plants from micro-vibration abrasion, the depths of abrasion defects needed to be accurately quantified. A finite element model of thimble tubes ET was established. The effects of depth, axial length and circumferential angle of abrasion defects of thimble tubes on ET signals were analyzed by simulation. Results show that the phase angle features of ET signals are not independently related to the defect depths，which means that conventional single frequency ET may lead to large errors of defect depths. Thus, a swept-frequency ET method was proposed for abrasion defects of thimble tubes, and an innovative feature namely zero-crossing frequency feature was extracted. Results of simulation analysis show that zero-crossing frequency feature is highly independently related to the defect depths.

Key words： thimble tube depth of abrasion defect swept-frequency eddy-current testing(ET) zero-crossing frequency feature

PACS:

TG115.28

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	Articles by authors
	ZHANG Lei1
	LIU Wujun3
	XIE Shejuan1
	4
	WANG Xiaogang2
	KONG Yuying2
	MA Qiang2
	CHEN Zhenmao1

Cite this article:

ZHANG Lei1,LIU Wujun3,XIE Shejuan1等. Swept-frequency ET and Innovative Feature Extraction of Abrasion Defects for Thimble Tubes in Nuclear Power Plants[J]. China Mechanical Engineering, 2021, 32(01): 18-25.

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http://www.cmemo.org.cn/EN/10.3969/j.issn.1004-132X.2021.01.003 OR http://www.cmemo.org.cn/EN/Y2021/V32/I01/18

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