Micro-mobile heat pipe-cooled nuclear power plants are promising candidates for distributed energy resource power genera-tors and can be flexibly deployed in remote places to meet increasing electric power demands.How...Micro-mobile heat pipe-cooled nuclear power plants are promising candidates for distributed energy resource power genera-tors and can be flexibly deployed in remote places to meet increasing electric power demands.However,previous steady-state simulations and experiments have deviated significantly from actual micronuclear system operations.Hence,a transient analysis is required for performance optimization and safety assessment.In this study,a hardware-in-the-loop(HIL)approach was used to investigate the dynamic behavior of scaled-down heat pipe-cooled systems.The real-time features of the HIL architecture were interpreted and validated,and an optimal time step of 500 ms was selected for the thermal transient.The power transient was modeled using point kinetic equations,and a scaled-down thermal prototype was set up to avoid mod-eling unpredictable heat transfer behaviors and feeding temperature samples into the main program running on a desktop PC.A series of dynamic test results showed significant power and temperature oscillations during the transient process,owing to the inconsistency of the rapid nuclear reaction rate and large thermal inertia.The proposed HIL approach is stable and effective for further studying of the dynamic characteristics and control optimization of solid-state small nuclear-powered systems at an early prototyping stage.展开更多
The dynamic model of LiBr absorption heat pump in shut-down process is established. The simulation results show good agreement with the experiments. The dynamic performance of high-pressure generator, low-pressure gen...The dynamic model of LiBr absorption heat pump in shut-down process is established. The simulation results show good agreement with the experiments. The dynamic performance of high-pressure generator, low-pressure generator and heat exchanger are analyzed in detail. The proper shut-down mode of the heat pump is presented,which, in consideration of solution parameters, has a great effect on the possibility of crystallization of some components.展开更多
某新能源汽车企业采用高耐蚀钢S450AW冲压右门板零件,出现四个拐角凸台高度明显偏低的问题,无法满足产品要求。为快速解决生产实际问题,根据产品数模制作拉延及整形分析模型,采用计算机辅助工程(CAE)模拟完成右车门板冲压全工序模拟分析...某新能源汽车企业采用高耐蚀钢S450AW冲压右门板零件,出现四个拐角凸台高度明显偏低的问题,无法满足产品要求。为快速解决生产实际问题,根据产品数模制作拉延及整形分析模型,采用计算机辅助工程(CAE)模拟完成右车门板冲压全工序模拟分析,将仿真分析结果与ATOS I 350&TRITOP三维光学测绘仪逆向扫面实际冲压模具上下模的模面进行对比研究,确定了冲压问题的产生原因并制定模具优化方案。实施优化方案并冲压验证,解决零件凸台高度不足问题,为今后解决此类问题提供了可供选择的技术方案。展开更多
基金This work was financially supported by the National Key R&D Program of China(No.2020YFB1901900)National Natural Science Foundation of China(No.12275175)+2 种基金Special Fund for Strengthening Industry of Shanghai(No.GYQJ-2018-2-02)Shanghai Rising Star Program(No.21QA1404200)the LingChuang Research Project of the China National Nuclear Corporation.
文摘Micro-mobile heat pipe-cooled nuclear power plants are promising candidates for distributed energy resource power genera-tors and can be flexibly deployed in remote places to meet increasing electric power demands.However,previous steady-state simulations and experiments have deviated significantly from actual micronuclear system operations.Hence,a transient analysis is required for performance optimization and safety assessment.In this study,a hardware-in-the-loop(HIL)approach was used to investigate the dynamic behavior of scaled-down heat pipe-cooled systems.The real-time features of the HIL architecture were interpreted and validated,and an optimal time step of 500 ms was selected for the thermal transient.The power transient was modeled using point kinetic equations,and a scaled-down thermal prototype was set up to avoid mod-eling unpredictable heat transfer behaviors and feeding temperature samples into the main program running on a desktop PC.A series of dynamic test results showed significant power and temperature oscillations during the transient process,owing to the inconsistency of the rapid nuclear reaction rate and large thermal inertia.The proposed HIL approach is stable and effective for further studying of the dynamic characteristics and control optimization of solid-state small nuclear-powered systems at an early prototyping stage.
基金This paper is supported by thy UTC RongHong foundation
文摘The dynamic model of LiBr absorption heat pump in shut-down process is established. The simulation results show good agreement with the experiments. The dynamic performance of high-pressure generator, low-pressure generator and heat exchanger are analyzed in detail. The proper shut-down mode of the heat pump is presented,which, in consideration of solution parameters, has a great effect on the possibility of crystallization of some components.
文摘某新能源汽车企业采用高耐蚀钢S450AW冲压右门板零件,出现四个拐角凸台高度明显偏低的问题,无法满足产品要求。为快速解决生产实际问题,根据产品数模制作拉延及整形分析模型,采用计算机辅助工程(CAE)模拟完成右车门板冲压全工序模拟分析,将仿真分析结果与ATOS I 350&TRITOP三维光学测绘仪逆向扫面实际冲压模具上下模的模面进行对比研究,确定了冲压问题的产生原因并制定模具优化方案。实施优化方案并冲压验证,解决零件凸台高度不足问题,为今后解决此类问题提供了可供选择的技术方案。
