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- 저자 : Hongmin Xin (검색결과 2 건)
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Study on tool wear for efficient grooving blisk with disc milling cutter
Qingsi Cheng,Song Wang,Hongmin Xin,Jian Zhang,Changfeng Yao,Minchao Cui,Guangping Li 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.10
Tool wear has an important influence on machining quality, cost, cutting force and heat. Grooving blisk with disc milling cutter is 3-4 times more efficient than plunge milling and side milling, but the tool wear is serious because of the large milling force and high milling temperature during the machining process. In the study, the damage and wear morphology of the tool was observed by focused ion/double beam system; the wear mechanism was studied by energy spectrum analysis; the tool life curve was drawn by the increase of flank wear. The experimental results show that the main wear and damage morphologies of disc milling cutter are chip sticking to the tool, chip accumulation, edge collapse, peeling, crack, plastic deformation and boundary wear; the main wear mechanism are abrasive wear, adhesive wear, oxidation wear and diffusion wear; the wear rate of the left blade is the fastest, followed by the right blade, and the wear rate of the middle blade is the slowest. These results can provide guidance for iimproving tool life, optimizing tool and mproving machining processes.
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Hong, Min,Xin, Huanhai,Liu, Weidong,Xu, Qian,Zheng, Taiying,Gan, Deqiang The Korean Institute of Electrical Engineers 2016 Journal of Electrical Engineering & Technology Vol.11 No.2
The introduction of renewable energy sources into the AC grid can change and weaken the strength of the grid, which will in turn affect the stability and robustness of the doubly-fed induction generator (DFIG) wind farm. When integrated with weak grids, the DFIG wind turbine with vector power control often suffers from poor performance and robustness, while the DFIG wind turbine with synchronized control provides better stability. This paper investigates the critical short circuit ratios of DFIG wind turbine with vector power control and synchronized control, to analyze the stability boundary of the DFIG wind turbine. Frequency domain methods based on sensitivity and complementary sensitivity of transfer matrix are used to investigate the stability boundary conditions. The critical capacity of DFIG wind farm with conventional vector power control at a certain point of common coupling (PCC) is obtained and is further increased by employing synchronized control properly. The stability boundary is validated by electromagnetic transient simulation of an offshore wind farm connected to a real regional grid.
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