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17 results on '"Qu, Yinghao"'

10. Multi-dimensional Detection of Parallel Wire Bundle Breakage Based on Magnetic Memory Weak Magnetic Leakage Effect.

Author

TONG Kai, ZHANG Hong, ZHAO Ruiqiang, ZHOU Jianting, and QU Yinghao

Abstract

In response to the existing problem of single dimension of cable breakage detection index, a multidimensional non-destructive inspection of cable breakage is carried out using magnetic memory weak leakage detection technology. A parallel wire bundle consisting of 37 steel wires was used to simulate the cable specimen. The leakage magnetic signals of the radial wire breakage depth and the axis as well as the circumferential breakage width were measured and analyzed. The results show that the axial leakage signal BX can determine the location of radial wire breakage and its depth trend, and it can also qualitatively characterize the change of axial wire breakage width. The peak-to-valley value of the normal leakage signal BZ-L curve has a good linear relationship with the axial wire breakage width. The linear fit of each condition is higher than 0.984. Based on the peak and valley values of the BZ-L curve, a quantitative characterization of the axial wire breakage width can be achieved. A good correspondence also exists between the circumferential wire breakage width and the peak-to-valley value of the BZ-L curve. The simulation results match with the experimental analysis. [ABSTRACT FROM AUTHOR]

Published
2023
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14. Study on working stress measurement method for steel bars inside RC bridges based on self-magnetic flux leakage spatial signals

Author

Zhao Ruiqiang, Jianting Zhou, Qu Yinghao, Hong Zhang, and Lei Fu

Subjects
Materials science, Magnetic characteristic, business.industry, Applied Mathematics, Magnetic flux leakage, Foundation (engineering), Stress measurement, Structural engineering, Condensed Matter Physics, Reinforced concrete, Stress (mechanics), Approximation error, Electrical and Electronic Engineering, business, Instrumentation, Spatial difference
Abstract

The measurement of the working stress of steel bars in concrete depends on an embedded sensor, which is difficult to replace once it is damaged. Innovatively, the magnetic characteristic “spatial difference parameter” was used to quantify the working stress of steel bars inside reinforced concrete (RC) bridges, which completely avoided the shortcomings of embedded sensors. The correlation between the stress of steel bars and the magnetic parameters was analyzed based on experimental results from nine steel bars. To be more suitable for practical engineering, the influences of the parameter lift-off value (LOV) and the initial stress value (ISV) on the experiment results were discussed. The results showed that the relative error of the measurement was almost less than 20%. The LOV and ISV did not significantly reduce the accuracy of the measurement results, which provided a good foundation for the application in the stress measurement for the actual RC bridges.

Published
2021

15. Research on the Method of Predicting Corrosion width of Cables Based on the Spontaneous Magnetic Flux Leakage

Author

Leng Liao, Hong Zhang, Yi Zhou, Qu Yinghao, and Zhao Ruiqiang

Subjects
Linear fitting, Materials science, Dx–y curves, 02 engineering and technology, 01 natural sciences, lcsh:Technology, Article, Corrosion, General Materials Science, Physics::Chemical Physics, MATLAB, lcsh:Microscopy, computer.programming_language, lcsh:QC120-168.85, lcsh:QH201-278.5, lcsh:T, 010401 analytical chemistry, Magnetic flux leakage, Mechanics, 021001 nanoscience & nanotechnology, Magnetic flux, 0104 chemical sciences, Lift (force), spontaneous magnetic flux leakage, Linear relationship, lcsh:TA1-2040, cable corrosion detection, lcsh:Descriptive and experimental mechanics, lcsh:Electrical engineering. Electronics. Nuclear engineering, 0210 nano-technology, lcsh:Engineering (General). Civil engineering (General), computer, Magnetic dipole, lcsh:TK1-9971, corrosion width
Abstract

The detection of cable corrosion is of great significance to the evaluation of cable safety performance. Based on the principle of spontaneous magnetic flux leakage (SMFL), a new method for predicting the corrosion width of cables is proposed. In this paper, in order to quantify the width of corrosion, the parameter about intersecting point distance between curves of magnetic flux component of x direction at different lift off heights (Dx) is proposed by establishing the theoretical model of the magnetic dipole of the rectangular corrosion defect. The MATLAB software was used to analyze the influencing factors of Dx. The results indicate that there exists an obvious linear relationship between the Dx and the y (lift off height), and the Dx&ndash, y curves converge to near the true corrosion width when y = 0. The 1/4 and 3/4 quantiles of the Dx&ndash, y image were used for linear fitting, which the intercept of the fitting equation was used to represent the predicted corrosion width. After the experimental study on the corrosion width detection for the parallel steel wire and steel strand, it is found that this method can effectively improve the detection accuracy, which plays an important role in cable safety assessment.

Published
2019

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