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RISS 인기검색어
- 검색키워드
- 저자 : Tang Jinyuan (검색결과 3 건)
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Comparisons of gear dynamic responses with rectangular mesh stiffness and its approximate form
Chen Siyu,Tang Jinyuan,Hu Zehua 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.9
The mesh stiffness is close to rectangular stiffness, and the first harmonic approximate term of rectangular stiffness is generally adoptedin the nonlinear gear dynamic analysis. The differences between the rectangular stiffness and its approximate form are analyzed indetail. The frequency response and dynamic factor are calculated by a numerical method, to illustrate the dynamic characteristics of thegear nonlinear system with different mesh stiffness forms. The results show that: The trends of frequency response of gear dynamic systemwith rectangular stiffness and its approximate form are identical. The jump phenomena are detected in both cases. Without the effectof static transmission error, the dynamic factor with rectangular mesh stiffness is larger than that with approximate mesh stiffness. Underdesign power and speed condition, the result with approximate mesh stiffness function may deduce reasonless suggestions for a designer. The static transmission error will enlarge the vibration amplitude and dynamic factor when the approximate mesh stiffness is adopted, butthe effects on the response of gear system with rectangular mesh stiffness are fractional. The mesh stiffness may excite the odd subharmonicresonance, and the static transmission error may excite the even sub-harmonic resonance respectively.
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Structure and Electrical Performance of Na<sub>2</sub>C<sub>6</sub>O<sub>6</sub> under High Pressure
Wang, Xuan,Zhang, Peijie,Tang, Xingyu,Guan, Junjie,Lin, Xiaohuan,Wang, Yajie,Dong, Xiao,Yue, Binbin,Yan, Jinyuan,Li, Kuo,Zheng, Haiyan,Mao, Ho-kwang American Chemical Society 2019 The Journal of Physical Chemistry Part C Vol. No.
<P>Sodium rhodizonate (Na<SUB>2</SUB>C<SUB>6</SUB>O<SUB>6</SUB>) has very high theoretical capacity as a positive electrode material of sodium-ion batteries, but it still has problems such as low actual capacity and poor electronic/ionic conductivity. In order to improve its conductivity, we investigated its structure and electrical properties under high pressure. By performing in situ X-ray diffraction, Raman, infrared absorption, and alternating current impedance spectroscopy in the range of 0-30 GPa at room temperature, we observed a phase transition at ∼11 GPa, with the conductivity increasing by an order of magnitude. Above ∼20 GPa, Na<SUB>2</SUB>C<SUB>6</SUB>O<SUB>6</SUB> gradually amorphized. During the decompression process, the pressure regulation of the structure and properties of the material are reversible. Our study shows that applying external pressure is an effective tool to improve the conductivity of molecular battery materials. The investigation will help to obtain next-generation electrode materials.</P> [FIG OMISSION]</BR>
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Novel kinematic and geometric views for improving tooth contact analysis of spatial gears
Wang Shenghui,Zhou Yuansheng,Chu Chih-Hsing,Tang Jinyuan 한국CDE학회 2022 Journal of computational design and engineering Vol.9 No.3
Tooth contact analysis (TCA) has been widely applied to evaluate the working performance of gear pairs. TCA is often formulated with five unknowns and five independent scalar equations. The solution process involves a global optimization problem with strong nonlinearity and numerical instability, especially for spatial gears with complicated tooth geometries. This study proposes novel kinematic and geometric views of gearing that reveal insights into the meshing process of spatial gears. One unknown can be removed from the position and normal equations of the TCA formulation. To solve the remaining four unknowns, a simplified optimization model with two unknowns is proposed, and the other two unknowns are obtained by using geometric iterative methods or directly from explicit expressions in some cases. A general algorithm was developed to solve the simplified TCA. The test results of both the spiral bevel and face gear drives validate the effectiveness of the proposed method.
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