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In the line-pipe industries with JCOE process, the unbend angle after removing punch load varies from the target angle due to elastic recovery in each bending step for forming the longitudinal-seam submerged arc pipes. This variation causes bad roundness in formed pipe and inconvenience of performing subsequent welding process. To improve the roundness, the unbend angle should be measured precisely...
Wireless energy transfer based on coupled magnetic resonances is a new technology which energy can be transferred via coupled magnetic resonances in the non-radiative near-field. A simple energy transfer system structure was proposed in this paper. Based on this structure, the back electromotive force (back-EMF) in the receiving coil related with different transfer distance and with driving frequency...
Aiming at the practical applications of novel wireless energy transfer, the mathematical model for wireless energy transfer devices based on intermediate frequency resonant is established in this paper. Based on the electromagnetic fields sine-band theory, the transfer scheme using lumped parameters is designed. It is proved that using the resonator with a high quality factor value and coupling coefficient...
In experiments of soil mechanics, it is important to study the motion of sand grains at high pressures. Technologies of image segmentation and object tracking can help to resolve this problem. Aiming at the dense sand grains images, this paper proposes a method to track sand grains from image sequences. A novel approach of dense grain segmentation based on boundary exploration is proposed. Firstly,...
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