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- 저자 : Yucheng Du (검색결과 3 건)
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Mesh stiffness analysis of beveloid gears for the rotating vector transmission
Yucheng Huang,Xuesong Du,Caichao Zhu,Gaoxiang Ni,Najeeb Ullah,Hao Liu 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.8
This paper investigates the meshing stiffness of beveloid gears in the beveloid rotate vector (BRV) transmission. It is a new kind of transmission evolved from rotate vector (RV) reducer. In the BRV transmission, the beveloid gear is a kind of involute gear with a bevel angle. The BRV transmission have high power density, large transmission ratio and high precision in geared coupled systems. However, there is rare systematic research conducted on the meshing stiffness analysis of the BRV transmission at present. Based on the loaded contact finite element analysis principle, a meshing stiffness analysis model for beveloid gears is established. The influence of different factors such as pitch cone angle, addendum coefficient, load and rim structure parameters of external gear on meshing stiffness are studied. The results show that the pitch cone angle and addendum coefficient have little effect on the shape of the meshing stiffness curve, but they have a significant influence on the amplitude of meshing stiffness. In contrast, the load can affect both the shape and the amplitude of the meshing stiffness curve obviously. Also, the size of scallop-hole and rim thickness have a great impact on the amplitude of the meshing stiffness. The prescribed piece of study can provide a better understanding for gear researchers in order to understand the influence of different parameters on dynamic characteristics analysis of the BRV transmission systems.
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A novel flexible micro-ratchet/ZnO nano-rods surface with rapid recovery icephobic performance
왕만상,Wenbo Yu,Yupei Zhang,우재영,Yucheng Du,Bo Wang,Yanbin Yun,유계성,이중기,Lei Wang 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.62 No.-
In this communication, we present a significant method to fabricate a robust icephobic surface on a flexible polymer substrate. The flexible functional surface is obtained by integrating both soft-lithography and crystal growth methods. Modified by the materials with low surface free energy, the composite surface exhibits a robust superhydrophobicity at not only room temperature but also low temperature. After freezing test, the surface can recover to its original function quickly, which has achieved the level for industrial application, and also performed significant role for enhancing the icephobic theories.
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Characteristics of La_2O_3―Y_2O_3―Mo cermet cathode with RE_2O_3 nano particles
Jinshu Wang,Wei Liu,Zhiyuan Ren,Fan Yang,Yiman Wang,Yucheng Du,Meiling Zhou 한국물리학회 2011 Current Applied Physics Vol.11 No.3
The secondary electron emission property and microstructure of La_2O_3―Y_2O_3―Mo cermet cathode have been studied. It shows that the cathode prepared by Sol―Gel doping method has fine microstructure containing rare earth oxide (RE_2O_3) nanoparticles and uniform distribution of different substances. Auger Electron Spectroscopy (AES) depth profile result shows that an RE_2O_3 layer about 28 nm in thickness could be formed on the cathode surface, which plays an important role in the emission. Pre-activation of the cathode is favorable for the improvement of emission property. La_2O_3―Y_2O_3―Mo cathode preactivated exhibits good secondary emission property. The secondary emission yield could reach 5.24,about 1.8 times higher than that of original cathode. The enhancement on the conductivity of materials resulting from the pre-activation is favorable for the replenishment and transport of electrons, thus the secondary emission property of the cathode could be improved.
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