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RISS 인기검색어
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- 저자 : Gao Yunguang (검색결과 2 건)
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Qi Gao,Yadong Gong,Yunguang Zhou,Xuelong Wen 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.1
Micro-milling is widely used as a method for machining of micro-parts with high precision and efficiency. Taking the nickel-based single-crystal superalloy DD98 as the research object, the crystal characteristics of single-crystal materials were analysed, and the removal mechanism of single-crystal micro-milled parts was described. Based on molecular dynamics, a simulation model for nickel-based single-crystal superalloy DD98 micro-milling was established. Based on the response surface method of central composite design, the influences of spindle speed, feed rate, and milling depth on the surface roughness were examined, and a second-order regression model of the DD98 surface roughness was established. Using analysis of variance and the residuals of the model, a significant influence on surface roughness was found in the following order from large to small: Feed rate, spindle speed, and milling depth. Comparisons were conducted between the micro-milling experimental values and the predicted model values for different process parameters. The results show that the model fit is relatively high, and the adaptability is good. Scanning electron microscopy analysis of the micro-milling surfaces was performed to verify the slip and the removal mechanism of single-crystal materials. These results offer a theoretical reference and experimental basis for micro-milling of single-crystal materials.
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Zhang Wenjie,Song Jiancheng,Lin Lingyan,Ren Hui,Zheng Lijun,Gao Yunguang,Song Yuan 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.3
Wireless power transfer (WPT) is becoming increasingly popular in stationary electric vehicle charging. Unfortunately, the adverse health eff ects due to the stray magnetic fi eld created by the WPT coils have increasingly caused concern. However, the traditional stray magnetic fi eld optimization design method based on fi nite element simulation is time-consuming and resource intensive. In this paper, a numerical method to reduce the stray magnetic fi eld around the asymmetrical wireless power transfer coils is proposed while maintaining the transmission power constant. The formulas of the stray magnetic fi eld around the WPT coils are derived, and the distribution characteristics of the stray magnetic fi eld are analyzed in detail. The stray magnetic fi eld around the asymmetrical wireless power transfer coils is optimized by the numerical method, and the number of the turns for the WPT coils corresponding to the minimum stray magnetic fi eld intensity is obtained. The eff ectiveness of the numerical method is verifi ed via the fi nite element analysis tool JMAG, and it is proved that the numerical method require less computational time than the fi nite element simulation. The experiments have also been carried out to evaluate the validity of the theoretical analysis.
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