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      저자 : Hechao Zhou (검색결과 2 건)
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      • KCI등재

        Effect of the worn status of wheel/rail profiles on wheel wear over curved tracks

        Jie Kou,Jimin Zhang,Hechao Zhou,Chengping Wang,Lixia Sun 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.3

        The worn status of wheel/rail profiles could change the wheel-rail contact and influence the wear rates of the wheel and rail. Worn wheel profiles of a Chinese intercity train and the worn rail profile of curved tracks were taken into account in this work. According to the dynamics model of the vehicle, teh wheel-rail three-dimensional steady-state rolling contact model, and the Archard wear model, a new fast calculation method of wheel wear rate was proposed. Simulation results show that obviously severe wear would distribute in the flange when the wheel and rail were worn. The side wear of rail gauge corner will seriously aggravate the wear of new wheel flange. The wear of the wheel is serious for teh worn wheel in the initial phase of service. Therefore, the re-profiling of wheels and rails should be scheduled cooperatively, and the wear of flange in the initial phase of service should addressed.

      • KCI등재

        Analysis of the running quality and road friendliness of the virtual track train in multiple running stages between stations

        Chengping Wang,Jimin Zhang,Hechao Zhou,Haiying Lu 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.2

        A virtual track train runs at fixed stations on designated lines. The short distance between stations requires frequent traction, uniform and braking, which will have a serious impact on vehicle performance and road life. A three-dimensional dynamics model of the virtual track train comprising three vehicles was established based on the theory of vehicle dynamics, tire dynamics, and nonlinear dynamics. The dynamics model comprised vehicle model and tireroad model, considering the dynamic coupling between vehicles and tire-road dynamic interaction. The field dynamic acceleration test of the actual virtual track train was used to validate the developed dynamics model. The running quality and road friendliness of the virtual track train in multiple running stages between stations were evaluated by theoretical analysis and numerical calculation. The results indicated that the running quality in the traction stage and braking stage is smaller than that in the uniform stage. The road friendliness in the uniform stage is better than that in the traction and braking stage. The increase in running speed and the decrease in road grade both reduce the running quality and road friendliness. The increase in acceleration or deceleration makes the road friendliness worse, and it has less impact on the running quality. The research results provide recommendations for the running mode of the virtual track train to improve the running quality. At the same time, they can provide guidance for asphalt pavement laying to slow down the road damage.

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