Most traditional wire rope instruments give the sum of the circumferential magnetic leakage of magnetized wire ropes and identify localized discontinuities according to it. In this way, the circumferential distributio...
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Most traditional wire rope instruments give the sum of the circumferential magnetic leakage of magnetized wire ropes and identify localized discontinuities according to it. In this way, the circumferential distribution of discontinuities, which has a considerable effect on wire rope's residual load-carrying capacity for the same number of breaks or other faults of the same degree, is ignored. A wire rope testing prototype based on a hall sensor array is developed to acquire the three-dimensional magnetic leakage of the rope surface, which is sensitive to the circumferential distribution of wire rope discontinuities, can distinguish between concentrated broken wires and dispersive ones, and gives more accurate localized discontinuity identification with the method of two-dimensional image processing. Experimental results show that the discrimination of the signal processing method for typical localized discontinuities, such as broken wires of different degrees or raised wires, can reach 91%.
This paper introduces a position and orientation tracking method, which has the potential to be used in capsule endoscope localization. This tracking method is based on the strength of the magnetic field generated by ...
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This paper introduces a position and orientation tracking method, which has the potential to be used in capsule endoscope localization. This tracking method is based on the strength of the magnetic field generated by a magnetic marker in the space. Levenberg–Marquardt optimization algorithm is used for calculation of the parameters of the magnetic marker. The experiment results showed that when the axes of all sensors are all in one direction, the tracking results rely much on the orientation of the dipole. When the magnetic dipole is in sensor's axial direction, the tracking error is within 4 mm in a space of 60×60×100 mm enclosed by 8 hallsensors; the system is real time and quite robust. But the trackable scope becomes much smaller when the dipole has an arbitrary orientation. The reason is analyzed theoretically.
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