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RISS 인기검색어
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- 저자 : Jingkai Sun (검색결과 2 건)
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YongJiang Chen,Jianghai Zhao,Chuangfan Yuan,Jingkai Sun 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.4
An analysis model of the contact characteristics of the double-nut preloaded ball screw which can consider the combined action of the axial load and the overturning moment is established, the model can consider non-uniform load distribution, and the validity of the model is verified by experiments. Based on this model, the influence of the combined action of axial load and overturning moment on the average value and distribution fluctuation value of the contact angle of the ball screw, the number of unloaded balls, the distribution fluctuation value of the contact load, and the static contact stiffness and other contact parameters are systematically analyzed, and get the following conclusions: The contact parameters of the ball screw are mainly affected by the axial load and the contact state between the ball and the raceway. The gradually increasing axial load basically reduces the influence of the overturning moment on the contact parameters of the ball screw. There is a critical value of the load in the axial direction within the range of the action value of the preload load. Only when the critical value is above the critical value, the contact parameters will change regularly with the changes in the axial stiffness and overturning moment. However, different critical values for the regular variation of contact parameters with axial load and overturning moment vary.
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Jing Kai,Liu Chang,Cao Xin,Sun Hexu,Dong Yan 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.5
Non-grid-connected wind power water-electrolytic hydrogen production system is an eff ective solution to wind power curtailment. However, the stability of the Source power supply is aff ected by the intermittent and volatility of the wind energy, which will lead to low effi ciency of hydrogen production on the Load. In this paper, a novel non-grid-connected Source-Load collaboration wind-hydrogen system is proposed to adapt to the variation of wind energy, which directly connects the Source wind turbines and the Load hydrogen production devices through a DC bus with a super capacitor group and auxiliary AC grid power supply. For the system, quasi-Z-source rectifi ers with a wide DC voltage adjustment range are developed for the Source and a modular proton exchange membrane (PEM) water electrolytic hydrogen production array is designed for adjusting the Load capacity. The basic architecture and the modelling method of the Source, the Load and DC bus are analyzed. A control strategy for the system is put forward to regulate the size of the PEM array with three diff erent operating modes and DC voltage collaboratively, by which the power fl ow management between the Source and the Load can be realized according to the wind power variation. Finally, two cases are carried out in the presence of diffi dent randomly varying wind power. The results show that the proposed non-grid-connected Source-Load collaboration of the wind-hydrogen system can maximize wind energy utilization of the Source and increase the effi ciency of hydrogen production of the Load in the case of wind power fl uctuations.
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