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RISS 인기검색어
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- 저자 : Zongde (검색결과 4 건)
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Cyclic Softening Properties of 30Cr2MoV Steel at Elevated Temperatures
Liu, Zongde,Yang, Kun,Bai, Shu Lin,An, Jiangying,Mao, Xue ping 대한금속재료학회(대한금속학회) 2001 METALS AND MATERIALS International Vol.7 No.1
Low cycle fatigue tests for 30Cr2MoV steel are done at both room and elevated temperatures and their softening properties are investigated. Based on the experimental results, a quantitative relationship between hardness and remaining life is established, allowing prediction of the remaining life of metals. A modified Mason-Coffin equation including the aging effect is also derived. Both the experimental and theoretical results show that it is useful to be able to predict the remaining life of a steam turbine rotor through the measurement of hardness.
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Xuezhong Fu,Yuanxing Huang,Zongde Fang,Yanmei Cui,Jie Sun 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.7
According to the lumped mass method, this study presents a bending axial– torsional coupled dynamic model of a dual-branch transmission system with offset nonorthogonal spur (ONS) face gear pairs. The common form and force of the ONS face gear pair, the layout form of the dual-branch transmission system, and meshing phase differences are investigated in detail. The dynamic model considers factors, such as meshing phase differences, meshing stiffness, installation errors, damping, and elastic deformations. Results show that the dynamic uneven load of the system is affected by the meshing phase differences and gear vibrations when no installation error occurs. The input load and torsional stiffness have a crucial effect on the dynamic load sharing coefficients when installation errors exist. Moreover, the support stiffness of the spur cylindrical pinion 1 and the meshing stiffness fluctuation amplitude of each gear pair should be smaller.
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Yan-Ming Mu,Xue-Ming He,Zongde Fang 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.22 No.12
To improve the dynamic performance of spiral bevel gear transmission, an ease-off flank modification method of the high-contact-ratio spiral bevel gear is proposed. First, the high-contact-ratio spiral bevel gear is designed by increasing the angle between the contact path and the pitch cone of a pinion tooth surface with ease-off technology. Second, the meshing performance of the high-contact-ratio spiral bevel gear designed utilizing ease-off technology is compared with the HCR spiral level gear designed by the local synthesis method. Finally, the loaded transmission error (the main vibration excitation of the gear transmission in the low-speed range), the meshing impact (the main vibration excitation of the gear transmission in the high-speed range) and the dynamic performance of the high-contact-ratio spiral bevel gear are compared with that of a low-contact-ratio spiral bevel gear. A simulation analysis based on the ease-off technology shows that the design contact ratio of the spiral bevel gear can be improved by increasing the angle between the contact path and the pitch cone of the pinion tooth surface; compared with the local synthesis method, the high-contact-ratio spiral bevel gear transmission designed by the ease-off flank modification method has a better meshing performance; increasing the design contact ratio can effectively reduce the loaded transmission error, and meshing impact, and obtain a spiral bevel gear transmission with good dynamic performance over the whole speed range.
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Haodong Ge,Yunbo Shen,Yuquan Zhu,Yingzhao Xiong,Bing Yuan,Zongde Fang 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.11
For simulation and calculation of load-sharing behavior of planetary gear train by using the lumped mass method, an exact computational model of time-varying meshing stiffness of inner gear meshing pair with thin-walled sleeve was needed. Therefore, based on analysis of the flexible ring gear structure with thin-walled sleeve, an accurately model is proposed to obtain the time-varying internal meshing stiffness. Then, according to Newton's second law, a group of parametric differential equations of planetary gear system were derived, with which the load-sharing coefficient of the system was obtained. The load-sharing behavior experimental for the planetary gear train with five planetary gears and with flexible ring gear was designed, while the arrangement of the strain gauge was investigated and the test was performed under different working conditions. The test results show that the error of load sharing coefficient calculated by theory and experiment is less than 5 %.
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