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Magnetic flux leakage sensors have been widely used for the structural health monitoring of ferrous materials (structural health monitoring). This article provides a new magnetic flux leakage sensor based on open magnetizing method. Starting with the traditional yoke magnetization method analyses, the provided open magnetizing method and testing pr...
Context in source publication
Context 1
... mass of both the sensors modeled previously was also calculated by directly inputting the materials' properties such as mass density, as listed in Table 3. From Table 3, it is indicated that the open method the- oretically owns much smaller and lighter sensor config- uration in contrast to the traditional yoke one. Functionally, the former method has the capability of Table 1. ...
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Citations
... special metrological care will be taken including a proper selection of a magnetometer and measuring range, sensitivity and resolution; the effect of diagnostic symptom dispersion MMM by following wire layers will be taken into account in algorithms of the measurement signal analysis. The magnetic and electromagnetic methods are also used in expert systems to Structural Health Monitoring (SHM) of ropes and conveyor belts [16,17]. In systems that: ...
Assurance of safe operation and maintenance of vertical and horizontal transportation systems (skip hoists, belt conveyor flights) is a main task for NDT specialists in mining engineering. An active and a passive methods of magnetic non-destructive testing are described in the paper. The active MRT method which uses a strong magnetic field and is a basic method in examination of ferromagnetic ropes is presented. Negative aspects of the MRT method are identified: reduced reliability of examination for compact ropes with surface wire contacts. A proposition of MRT method complementation by means of a passive NDT method-Metal Magnetic Memory (MMM) is also described. In the paper there are presented: theoretical foundations of changes in ferromagnetic remanence under the influence of stresses and operational conditions, a previous scope of the MMM method in ISO 24497, observations of MMM method users from examinations out of the scope of ISO 24497 and results of own research (laboratory and comparative studies) performed on an operational object. It has been pointed out that sensitivity and resolution of contemporary triaxle magnetometers enable to reliably detect magnetic anomalies in magnetic signatures of stranded and compact ropes without the necessity of their magnetization. MRT and MMM methods complement each other. Therefore, it is reasonable to apply both methods in order to increase reliability of examinations.
The magnetic flux leakage method is widely used for non-destructive testing in wire rope applications. A non-destructive testing device for wire rope based on remanence was designed to solve the problems of large volume, low accuracy, and complex operations seen in traditional devices. A wavelet denoising method based on ensemble empirical mode decomposition was proposed to reduce the system noise in broken wire rope testing. After extracting the defects image, the wavelet super-resolution reconstruction technique was adopted to improve the resolution of defect grayscale. A back propagation neural network was designed to classify defects by the feature vectors of area, rectangle, stretch length, and seven invariant moments. The experimental results show that the device was not only highly precise and sensitive, but also easy to operate; noise is effectively suppressed by the proposed filtering algorithm, and broken wires are classified by the network.
