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RISS 인기검색어
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- 저자 : Junyue Yang (검색결과 4 건)
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Transmission performance of planetary permanent magnet gear with few pole difference
Junyue Yang,Yanjun Ge 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.12
To study the transmission characteristics of a planetary permanent magnet gear with few pole difference, a two-dimensional analytical model based on air gap magnetic field is established, the solutions of Laplace and Poisson equations are obtained by separating variables, and the analytical expression of air gap magnetic induction intensity is developed through coordinate transformation and superposition principle. The electromagnetic torque formula is derived further. On the basis of theoretical analysis, a single-chip experimental prototype with a rated torque of 45 Nm is designed and manufactured. The correctness of the analytical model of air gap magnetic field is verified by air gap magnetic field detection experiment. The critical static torque and magnetic torque angle characteristics are determined by static torque loading experiment. The correctness of the transmission principle and magnetic field analysis is verified by dynamic loading experiment, and the dynamic torque fluctuation is analyzed.
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Yang Yang,Yuan Wang,Qianfeng Liao,Jiongliang Pan,Junyu Meng,Hao Huang 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.4
In the corner milling process, processing energy consumption is a very important objective, since the energy efficiency of CNC machine is barely above 14.8%. Meanwhile, the excessive processing temperature will increase the thermal deformation of the product and leads to quality decline. Improper process parameters will lead to unnecessary high temperature and energy consumption. By optimizing the process parameters, the appropriate temperature and Specific Energy Consumption can be obtained. This study investigated into modeling Specific Energy Consumption and temperature in corner milling process using variable-fidelity metamodels. The adopted variable-fidelity metamodels are constructed by Hierarchical Kriging, in which 48 sets of low-fidelity data obtained from the AdvantEdge software simulation are used to reflect the trends of the metamodels, and 16 sets of high-precision data obtained from physical experiments are used to calibrate the trends. The experimental cost is reduced and the prediction accuracy is increased by making full use of both sets of data. An improved K-means Multi-objective Particle Swarm Optimization algorithm was adopted and applied on the multi-objective corner milling parameters optimization problem to find satisfactory specific energy consumption and temperature. The obtained Pareto solutions can provide guidance for selecting process parameters according to different requirements, such as reducing energy consumption or temperature.
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Huimin Zhao,Junyu Nie,Xiangxing Zhu,Yangqing Lu,Xingwei Liang,Huiyan Xu,Xiaogan Yang,Yunkai Zhang,Kehuan Lu,Shengsheng Lu 대한수의학회 2018 Journal of Veterinary Science Vol.19 No.5
In this study, we attempted to establish a culture system for in vitro spermatogenesis from spermatogonial stem cells (SSCs) of Bama mini-pig. Dissociated testicular cells from 1-month-old pigs were co-cultured to mimic in vivo spermatogenesis. The testicular cells were seeded in minimum essential medium alpha (a-MEM) supplemented with Knockout serum replacement (KSR). Three-dimensional colonies formed after 10 days of culture. The colonies showed positive staining for SSC-associated markers such as UCHL1, PLZF, THY1, OCT4, Dolichos biflorus agglutinin, and alkaline phosphatase. Induction of SSCs was performed in a-MEM + KSR supplemented with retinoic acid, bone morphogenetic protein 4, activin A, follicle-stimulating hormone, or testosterone. The results showed that STRA8, DMC1, PRM1, and TNP1 were upregulated significantly in the colonies after induction compared to that in testis from 1-month-old pigs, while expression levels of those genes were significantly low compared to those in 2-month-old testis. However, upregulation of ACROSIN was not significant. Replacement of a-MEM and KSR with Iscove’s modified Dulbecco’s medium and fetal bovine serum did not upregulate expression of these genes significantly. These results indicate that SSCs of Bama mini-pig could undergo differentiation and develop to a post-meiotic stage in α-MEM supplemented with KSR and induction factors.
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Multi‑objective parameter optimization of multi‑shaft ring‑plate magnetic gear
Yanjun Ge,Dongning Liu,Junyue Yang,Daming Wang 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.3
Parameter setting and optimization are key steps to improving the transmission performance of eccentric permanent magnetgear. Studying this step makes it possible to analyze the transmission relationship between the design parameters, and improve both the operation stability and the carrying capacity of eccentric permanent magnet gear. Taking multi-shaft ring-plate magnet gear (MRMG) as the research object, this paper analyzes the influence of actual structural parameters on torque performance through the comprehensive sensitivity method, and selects the parameters with the greatest influence as the main optimization parameters. Then using the BSO algorithm and the BP neural network, a prediction model of MRMG electromagnetic torque and torque density is established, the relationship between each of the parameters is analyzed, and the optimization parameter points are determined. By comparison with finite element simulations and experiments, the built model and its measured results and FEM analysis are shown to have good accuracy (error < 6%). Moreover, the model can quickly and accurately obtain optimization parameters, and greatly improve the transmission performance of the structure (the maximum torque increases by 15%, and the torque density increases by 36%).
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