Research on Energy-stored Programmable 5.0 kA Surge Current Testing Equipment

The article analyzes the metrological certification and test conditions for verification equipment. The main tasks of metrological certification, test conditions, accuracy characteristics of verification equipment, primary, repeated and periodic, expert and inspection certification of verification equipment are considered in the article. Besides, the major tasks of the testing equipment certification are considered as well. They are: establishing the current testing equipment eligibility in accordance with its purpose, establishing the actual reproducibility values of test conditions implemented by testing equipment and assessing the technical characteristics compliance of testing equipment with the safety, hygienic and other special requirements

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Discussion on “Production testing equipment” at the Birmingham Section of the Institution

Journal of the Institution of Production Engineers ◽

10.1049/jipe.1932.0005 ◽

1932 ◽

Vol 11 (1) ◽

pp. 46

Author(s):

R.H. Youngash ◽

E.W. Field ◽

I.H. Wright ◽

J.H. Garnett ◽

H.C. Armitage ◽

...

Keyword(s):

Testing Equipment ◽

Production Testing

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Reconstruction of complex shaped crack from ECT signals based on a fast forward solver using an advanced multi-media element

International Journal of Applied Electromagnetics and Mechanics ◽

10.3233/jae-209372 ◽

2020 ◽

Vol 64 (1-4) ◽

pp. 621-629

Author(s):

Yingsong Zhao ◽

Cherdpong Jomdecha ◽

Shejuan Xie ◽

Zhenmao Chen ◽

Pan Qi ◽

...

Keyword(s):

Coefficient Matrix ◽

Crack Edge ◽

Numerical Accuracy ◽

Gauss Point ◽

Current Testing ◽

Efficient Simulation ◽

Shaped Crack ◽

Multi Media ◽

Profile Reconstruction ◽

Crack Profile

In this paper, the conventional database type fast forward solver for efficient simulation of eddy current testing (ECT) signals is upgraded by using an advanced multi-media finite element (MME) at the crack edge for treating inversion of complex shaped crack. Because the analysis domain is limited at the crack region, the fast forward solver can significantly improve the numerical accuracy and efficiency once the coefficient matrices of the MME can be properly calculated. Instead of the Gauss point classification, a new scheme to calculate the coefficient matrix of the MME is proposed and implemented to upgrade the ECT fast forward solver. To verify its efficiency and the feasibility for reconstruction of complex shaped crack, several cracks were reconstructed through inverse analysis using the new MME scheme. The numerical results proved that the upgraded fast forward solver can give better accuracy for simulating ECT signals, and consequently gives better crack profile reconstruction.

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Probabilistic evaluation of detection capability of eddy current testing to inspect pitting on a stainless steel clad using multiple signal features

International Journal of Applied Electromagnetics and Mechanics ◽

10.3233/jae-209306 ◽

2020 ◽

Vol 64 (1-4) ◽

pp. 47-55

Author(s):

Takuma Tomizawa ◽

Haicheng Song ◽

Noritaka Yusa

Keyword(s):

Stainless Steel ◽

Eddy Current ◽

Pressure Vessels ◽

Eddy Current Testing ◽

Probability Of Detection ◽

Current Testing ◽

Multiple Signal ◽

Signal Features ◽

Inner Surface ◽

Drill Holes

This study proposes a probability of detection (POD) model to quantitatively evaluate the capability of eddy current testing to detect flaws on the inner surface of pressure vessels cladded by stainless steel and in the presence of high noise level. Welded plate samples with drill holes were prepared to simulate corrosion that typically appears on the inner surface of large-scale pressure vessels. The signals generated by the drill holes and the noise caused by the weld were examined using eddy current testing. A hit/miss-based POD model with multiple flaw parameters and multiple signal features was proposed to analyze the measured signals. It is shown that the proposed model is able to more reasonably characterize the detectability of eddy current signals compared to conventional models that consider a single signal feature.

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