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Numerical Simulation of Gear Heat Distribution in Meshing Process Based on thermal-structural Coupling

Journal of Mechanical Engineering Research 2019年第2期2卷 1-7页

作者： Peixiang Xu Yihua Cao Wensong Nie School of Aeronautic Science and Engineering Beihang UniversityBeijing100191China

The thermal balance state of high-speed and heavy-load gear transmissionsystem has an important influence on the performance and failure of geartransmission and the design of gear lubrication system. Excessive surfacetemperature of gear teeth is the main cause of gluing failure of gear contactsurface. To investigate the gear heat distribution in meshing processand discuss the effect of thermal conduction on heat distribution,a finiteelement model of spur gear is presented in the paper which can representgeneral involute spur gears. And a simulation approach is use to calculategear heat distribution in meshing process. By comparing with theoreticalcalculation, the correctness of the simulation method is verified, and theheat distribution of spur gear under the condition of heat conduction isfurther analyzed. The difference between the calculation results with heatconduction and without heat conduction is compared. The research hascertain reference significance for dry gear hobbing and the same type ofthermal-structural coupling analysis.

关键词： thermal-structural coupling Transient simulation Heat distribution

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Influence of Long-term Climate on Fatigue Life of Bridge Pier Concrete and a Reinforcement Method

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Hydro Science & Marine Engineering 2019年第1期1卷 2-8页

作者： Nam-Hyok Ri Kum-Hyok So Yong-Sop Ri Zhiyao Ma Yong-Ae Kim Hui-Gwang Yun School of Architecture Tianjin UniversityTianjin300072China Faculty of Mechanics Engineering Kim Il Sung UniversityPyongyangDPR of Korea School of Civil Engineering Tianjin UniversityTianjin300072China Department of Resources Exploration Engineering Kim Chaek University of technologyPyongyangDPR of Korea

This paper quantitatively evaluated the fatigue life of concrete around the air-water boundary layer of bridge piers located in inland rivers,considering the long-term *** paper suggests a method to predict the low-cycle fatigue life by demonstrating a thermal-fluid-structural analysis of bridge pier concrete according to long-term climate such as temperature,velocity and pressure of air and water in the process of freezing and thawing in *** addition,it proposes a reinforcing method to increase the life of damaged piers and proves the feasibility of the proposed method with numerical comparison experiment.

关键词： Hydraulic concrete Bridge pier Concrete depression failure Scour phenomenon Low-cycle fatigue life Long-term climate thermal-structural analysis Fluid-structural analysis ANSYS

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