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Specific to a problem of large vibro-impact aris ing from the cutting unit of the hard rock tunnel boring machine (TBM), a hybrid magnetic coupler based on soft start was proposed in this paper. The mathematical model for total eddy current losses of such a coupler was established by field-circuit method. Then, magnetic-thermal coupling simulation was performed by virtue of three-dimensional finite element software. In addition, an experimental prototype was independently designed; by comparing the model with experimental data, validity of the above mathematical model was verified. The relevant research results indicated that calculated values were consistent with experimental values, and the magneto thermal coupling method could be applied to accurately analyze temperature distribution of the hybrid magnetic coupler. By contrast to the existing magnetic coupling of the same dimension, output efficiency of the hybrid magnetic coupler was improved by 1.2%. Therefore, this research technique can provide references for designing the cutting unit of hard rock TBM with a high start impact.
Shuang Wang; Yongcun Guo; Gang Cheng; Deyong Li. Performance Study of Hybrid Magnetic Coupler Based on Magneto Thermal Coupled Analysis. Energies 2017, 10, 1148 .
AMA StyleShuang Wang, Yongcun Guo, Gang Cheng, Deyong Li. Performance Study of Hybrid Magnetic Coupler Based on Magneto Thermal Coupled Analysis. Energies. 2017; 10 (8):1148.
Chicago/Turabian StyleShuang Wang; Yongcun Guo; Gang Cheng; Deyong Li. 2017. "Performance Study of Hybrid Magnetic Coupler Based on Magneto Thermal Coupled Analysis." Energies 10, no. 8: 1148.
The size and change of the impact load of coal material applied to the skip are studied aiming at the quantitative loading system of the skip. Based on the impulse theorem and with reasonable assumption, the calculation formula for impact force of the coal material is deducted and the impact characteristic of the impact force to the quantitative loading system of the skip is analyzed. The process of the coal material falling from quantitative conveyor to skip is analyzed with the discrete element simulation so that the distributed load of the impact force of the coal material at the skip bottom is obtained. The results show that the coal material produces large impact force (687 N) to the skip bottom the moment the coal material falls into the skip, and then the force decreases rapidly to about 245 N and increases gradually during the fluctuation; the impact force applied to the skip bottom increases with the increase of the coal transportation speed and the size of discharging port of the chute, but it is not in direct proportional relationship. The simulation results are basically the same as the experimental results. Finally the optimization parameters of the speed of quantitative conveyor and the size of the discharging port of the chute are searched for so as to improve the capacity of the conveyor and impact load assumed by the skip bottom.
Shuang Wang; Kun Hu; Gang Cheng; De-Yong Li. Optimization Research of Mine Skip Quantitative Loading System. 3D Research 2016, 7, 1 -11.
AMA StyleShuang Wang, Kun Hu, Gang Cheng, De-Yong Li. Optimization Research of Mine Skip Quantitative Loading System. 3D Research. 2016; 7 (2):1-11.
Chicago/Turabian StyleShuang Wang; Kun Hu; Gang Cheng; De-Yong Li. 2016. "Optimization Research of Mine Skip Quantitative Loading System." 3D Research 7, no. 2: 1-11.