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RISS 인기검색어
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- 저자 : Yongqiang Guan (검색결과 2 건)
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Yongqiang Guan,Jianmei Wang,Ke Ning,Dingbang Hou 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.10
Taking the double-cone expansion joint sleeve (EJS) as an example, this paper proposes a hybrid prediction method of load-carrying capacity considering the displacement boundary conditions of EJS and rotation angle of spindle, and a comprehensive optimization method for the structure of EJS is established using this method. Firstly, based on the thickwalled cylinder theory and considering the displacement boundary conditions of interference contact surface, a new calculation method for calculating torque is presented, and the main parameters affecting load-carrying capacity are determined. Secondly, the finite element method is used to simulate assembly process and working process of EJS to obtain the ultimate torque, the effects of inner ring, outer ring, taper, elastic modulus, and friction coefficient are investigated. Based on the hybrid prediction results of load-carrying capacity, the multi-objective optimization is carried out using genetic algorithm through the construction of orthogonal experimental combination, the optimization of structural parameters of EJS is realized. The results indicate that the maximum equivalent stress is reduced by 20.88 %, the ultimate torque is increased by 0.23 %, and the mass is reduced by 5.11 %. It is proved that the method can effectively reduce maximum equivalent stress and solve design defects caused by stress concentration.
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Wang Yongqiang,Liu Han,Feng Changhui,Guan Jie,Geng Yicheng 한국섬유공학회 2019 Fibers and polymers Vol.20 No.10
Electric tree aging due to the action of long-term partial discharge stress of epoxy resin casting insulation is amajor problem in electrical engineering. On the discharge experimental platform, initiation and culture experiments of theelectric trees were carried out at a power frequency voltage of 20 kV. The mass fractions of the spherical glass fibers were 0,0.5, 1, 2 and 3 %. The results showed that the electrical dendritic process of epoxy resin experienced initiation, growth, lagand burst periods, the phase maps of the corresponding partial discharges in the four periods were all “mountain-like”. Theelectric tree of pure epoxy resin showed a typical dendritic structure, after the glass fiber was properly added, the electric treebecame lighter in color with a more complicated shape, the damage also became more serious, however, the growth of theelectric branch was suppressed. The electric tree aging channel of the epoxy resin appeared black and under microscopy themicro-branched channel wall appeared white. When the amount of glass fiber was 2 %, the initiation time of the electric treeswas prolonged, the growth rate of the electric trees decreased and suppressing development of the electric tree branches wasoptimal.
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