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 surface...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.展开更多
In this article, we discuss the existence and uniqueness of solutions for a coupled two-parameter system of sequential fractional integro-differential equations supplemented with nonlocal integro-multipoint boundary c...In this article, we discuss the existence and uniqueness of solutions for a coupled two-parameter system of sequential fractional integro-differential equations supplemented with nonlocal integro-multipoint boundary conditions. The standard tools of the fixed-point theory are employed to obtain the main results. We emphasize that our results are not only new in the given configuration, but also correspond to several new special cases for specific values of the parameters involved in the problem at hand.展开更多
An ITER torus cryo-pump housing （TCPH）, which encloses a torus cryo-pump, is connected to a vacuum vessel （VV） by a set of associated double bellows. There are complicated loads due to two different operating stat...An ITER torus cryo-pump housing （TCPH）, which encloses a torus cryo-pump, is connected to a vacuum vessel （VV） by a set of associated double bellows. There are complicated loads due to two different operating states （pumping and regeneration） and foreseeable accidents with the cryo-pump. This paper describes a thermal-structural coupled analysis of the present TCPH according to tho allowatfle stress criteria of RCC-MR, in which the worst cases and outcomes of various load combinations are obtained. Meanwhile, optimization of the structure has been carried oul, to obtain positive analysis results and an adequate safety margin.展开更多
综合能源系统在提高可再生能源利用率和为系统提供灵活性方面具有一定优势,如何厘清其物料流与能量流复杂耦合关系,建立优化运行策略是亟待解决的问题。以甲醇化工园区为例,构建甲醇化工园区综合能源系统(Methanol Chemical Park Integr...综合能源系统在提高可再生能源利用率和为系统提供灵活性方面具有一定优势,如何厘清其物料流与能量流复杂耦合关系,建立优化运行策略是亟待解决的问题。以甲醇化工园区为例,构建甲醇化工园区综合能源系统(Methanol Chemical Park Integrated Energy System, MCPIES),运用序贯模块法对甲醇生产过程进行模块化处理,通过依次求解生产过程中关键的物料流,确定甲醇生产过程的物料流平衡关系,在此基础上建立量化甲醇生产单元物料流与能量流耦合关系的数学模型,从而实现其优化运行调度;同时考虑MCPIES的生产柔性可调节特性,设置多个算例对比验证其柔性可调节特性对其日常生产运行经济性的影响。仿真计算结果显示,该策略可有效地降低园区的用能成本。展开更多
文摘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.
文摘In this article, we discuss the existence and uniqueness of solutions for a coupled two-parameter system of sequential fractional integro-differential equations supplemented with nonlocal integro-multipoint boundary conditions. The standard tools of the fixed-point theory are employed to obtain the main results. We emphasize that our results are not only new in the given configuration, but also correspond to several new special cases for specific values of the parameters involved in the problem at hand.
基金supported by International Thermonuclear Experimental Reactor (ITER) Specific Plan in China (2009GB101004)
文摘An ITER torus cryo-pump housing （TCPH）, which encloses a torus cryo-pump, is connected to a vacuum vessel （VV） by a set of associated double bellows. There are complicated loads due to two different operating states （pumping and regeneration） and foreseeable accidents with the cryo-pump. This paper describes a thermal-structural coupled analysis of the present TCPH according to tho allowatfle stress criteria of RCC-MR, in which the worst cases and outcomes of various load combinations are obtained. Meanwhile, optimization of the structure has been carried oul, to obtain positive analysis results and an adequate safety margin.
文摘综合能源系统在提高可再生能源利用率和为系统提供灵活性方面具有一定优势,如何厘清其物料流与能量流复杂耦合关系,建立优化运行策略是亟待解决的问题。以甲醇化工园区为例,构建甲醇化工园区综合能源系统(Methanol Chemical Park Integrated Energy System, MCPIES),运用序贯模块法对甲醇生产过程进行模块化处理,通过依次求解生产过程中关键的物料流,确定甲醇生产过程的物料流平衡关系,在此基础上建立量化甲醇生产单元物料流与能量流耦合关系的数学模型,从而实现其优化运行调度;同时考虑MCPIES的生产柔性可调节特性,设置多个算例对比验证其柔性可调节特性对其日常生产运行经济性的影响。仿真计算结果显示,该策略可有效地降低园区的用能成本。
