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RISS 인기검색어
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- 저자 : Yimin Xia (검색결과 3 건)
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Xia Nenghong,Chen Mengqi,Zhu Yimin 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.3
This paper targets to meet three key requirements of dynamic wireless charging system (WCS) for electric vehicles: high output power, misalignment tolerance, and good interoperability. A hybrid wireless charging system with transmitter module composed of coplanar double bipolar pads (BPPs) is designed. The primary side is composed of two BPPs which are driven out of phase to function as bipolar pads for generating larger fundamental magnetic fux height than unipolar pads. A hybrid compensation topology where the decoupled coils in the two BPPs adopt (LCC, S) and (S, LCC) topology, respectively, and that in BPP on the secondary side adopt (LCC, S) topology, forming four coupled coil pairs with LCC-LCC, S–S, S-LCC and LCC-S topologies. This hybrid compensation can efectively restrain the fuctuation of output power caused by the variation of mutual inductance in dynamic charging. And the symmetry of both the pad structure (BPP) and the compensation topologies ensures the transmitter module a good interoperability. The designed system is validated by experimental study on a 6 kW WCS prototype, where the deviations of output power are lower than 2.9% under a 220 mm X-axis misalignment with an efciency higher than 88.6%.
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Wear Characteristics of TBM Disc Cutter Ring Sliding against Different Types of Rock
Laikuang Lin,Yimin Xia,Xuhui Zhang 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.10
To investigate wear characteristics of tunnel boring machine (TBM) disc cutter rings interacting with types of rock, a range of wear tests were performed on a TBM cutter test rig, and laboratory-scale disc cutters were used in the experiments. The mass loss, vertical load, temperature field, wear mechanism and change rule of cutter tip for the disc cutter rings were obtained during the tests. The results indicate that the rock types and properties of rock exhibit great influences on the cutter wear. The variation of the weight loss testing with different types of rock is partially explained by the discrepancies of vertical load, cutting temperature, and the transition of wear mechanisms. In addition, the test results show that the wear characteristics of cutter rings are mainly affected by uniaxial compressive strength (UCS) rather than equivalent quartz content (EQC) for types of rock. This study will benefit the design of cutter rings with enhanced wear resistance.
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Structure effect of a suction pipe on slag-discharging performance in a shaft boring machine
Hejia Jiang,Laikuang Lin,Zhongbao Wen,Xuemeng Xiao,Zixiong Zhou,Yimin Xia 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.9
The efficiency and stability of shaft boring machines depend critically on the slag-discharging system. In this study, we simulate the slagging process by using the coupled computational fluid dynamics/discrete element method and validate the method’s reliability through experiments. We investigate the impact of outlet diameter, inlet diameter, and outlet section length on slag-discharging performance. We establish the slag-discharging principle of the suction pipe by analyzing the particle motion trajectory. The flow field close to the suction pipe can be classified into collecting and lifting zones on the basis of the main flow direction velocity. Furthermore, we propose pipes with seven typical types, among which the straightconical type exhibits the most favorable slag-discharging performance. The straight-conical pipe enhances the slag-discharging mass by 22.49 % compared with the straight pipe.
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