An enhancement in the wheel-rail contact model used in a nonlinear vehicle-structure interaction(VSI)methodology for railway applications is presented,in which the detection of the contact points between wheel and rai...An enhancement in the wheel-rail contact model used in a nonlinear vehicle-structure interaction(VSI)methodology for railway applications is presented,in which the detection of the contact points between wheel and rail in the concave region of the thread-flange transition is implemented in a simplified way.After presenting the enhanced formulation,the model is validated with two numerical applications(namely,the Manchester Benchmarks and a hunting stability problem of a sus-pended wheelset),and one experimental test performed in a test rig from the Railway Technical Research Institute(RTRI)in Japan.Given its finite element(FE)nature,and contrary to most of the vehicle multibody dynamic commercial software that cannot account for the infrastructure flexibility,the proposed VSI model can be easily used in the study of train-bridge systems with any degree of complexity.The validation presented in this work proves the accuracy of the proposed model,making it a suitable tool for dealing with different railway dynamic applications,such as the study of bridge dynamics,train running safety under different scenarios(namely,earthquakes and crosswinds,among others),and passenger riding comfort.展开更多
汽车底盘构造是车辆工程专业一门重要的专业基础课。目前的教学中大多采用以教师为中心的教育模式。文章在OBE(Outcomes Based Education)理念的模式下,探讨了汽车底盘构造教学内容、教学方法与手段等方面的改革思路,从而增强学生学习...汽车底盘构造是车辆工程专业一门重要的专业基础课。目前的教学中大多采用以教师为中心的教育模式。文章在OBE(Outcomes Based Education)理念的模式下,探讨了汽车底盘构造教学内容、教学方法与手段等方面的改革思路,从而增强学生学习兴趣提高课程教学质量。展开更多
针对风冷型质子交换膜燃料电池与锂电池组成的小型车用混合动力系统,提出一种根据SOC(state of charge)动态调节功率跟随系数的能量管理方法,完成混合动力观光车样车研制.对构成样车的混合动力系统、氢气储存供给系统、信号控制系统3部...针对风冷型质子交换膜燃料电池与锂电池组成的小型车用混合动力系统,提出一种根据SOC(state of charge)动态调节功率跟随系数的能量管理方法,完成混合动力观光车样车研制.对构成样车的混合动力系统、氢气储存供给系统、信号控制系统3部分进行了详细阐述,并对不同工况下功率跟随算法调节系数对控制效果的影响进行了分析;采用动态改变调节系数降低功率跟随算法控制引起的锂电池SOC及燃料电池输出功率波动,延长电堆使用寿命;通过样车实际运行测试,验证混合动力控制方法的有效性.测试结果表明:运行过程中燃料电池平均工作效率达到48.15%,并推算理论最大续航里程为94 km,与实际运行结果吻合.展开更多
基金Base Funding-UIDB/04708/2020 and Programmatic Funding-UIDP/04708/2020 of the CONSTRUCT-Instituto de I&D em Estruturas e Construções-funded by national funds through the FCT/MCTES(PIDDAC)Grant no.2020.00305.CEECIND from the Stimulus of Scientific Employment,Individual Support(CEECIND)-3rd Edition provided by“FCT-Fundação para a Ciência e Tecnologia.”。
文摘An enhancement in the wheel-rail contact model used in a nonlinear vehicle-structure interaction(VSI)methodology for railway applications is presented,in which the detection of the contact points between wheel and rail in the concave region of the thread-flange transition is implemented in a simplified way.After presenting the enhanced formulation,the model is validated with two numerical applications(namely,the Manchester Benchmarks and a hunting stability problem of a sus-pended wheelset),and one experimental test performed in a test rig from the Railway Technical Research Institute(RTRI)in Japan.Given its finite element(FE)nature,and contrary to most of the vehicle multibody dynamic commercial software that cannot account for the infrastructure flexibility,the proposed VSI model can be easily used in the study of train-bridge systems with any degree of complexity.The validation presented in this work proves the accuracy of the proposed model,making it a suitable tool for dealing with different railway dynamic applications,such as the study of bridge dynamics,train running safety under different scenarios(namely,earthquakes and crosswinds,among others),and passenger riding comfort.
文摘针对风冷型质子交换膜燃料电池与锂电池组成的小型车用混合动力系统,提出一种根据SOC(state of charge)动态调节功率跟随系数的能量管理方法,完成混合动力观光车样车研制.对构成样车的混合动力系统、氢气储存供给系统、信号控制系统3部分进行了详细阐述,并对不同工况下功率跟随算法调节系数对控制效果的影响进行了分析;采用动态改变调节系数降低功率跟随算法控制引起的锂电池SOC及燃料电池输出功率波动,延长电堆使用寿命;通过样车实际运行测试,验证混合动力控制方法的有效性.测试结果表明:运行过程中燃料电池平均工作效率达到48.15%,并推算理论最大续航里程为94 km,与实际运行结果吻合.
