In recent years,significant development activity has been seen in battery electric and hydrogen locomotives.To fully understand the potential benefits of these zero-emission technologies and their application in locom...In recent years,significant development activity has been seen in battery electric and hydrogen locomotives.To fully understand the potential benefits of these zero-emission technologies and their application in locomotive design,a design study utilising a digital twin framework can be employed.While current research on the use of digital twins for battery and hydrogen-powered rail vehicles is limited,recent studies conducted at the Centre for Railway Engineering at CQUniversity indicate potential challenges with implementing standard 6-axle locomotives for zero-emission designs considering heavy haul operational needs and scenarios.These challenges are related to limitations in energy storage capacity and optimisation of train operation scenarios.By considering an 8-axle locomotive design concept and employing a digital twin framework in the design process,a more comprehensive assessment of conceptual development,design and requirements can be achieved.This will ensure the locomotive design meets standards,guidelines,and codes of practice,ultimately contributing to achieving net-zero emission goals in loco-motive traction.展开更多
Whole trip longitudinal dynamics and energy analysis of heavy haul trains are required by operators and manufacturers to enable optimisation of train controls and rolling stock components. A new technology named train...Whole trip longitudinal dynamics and energy analysis of heavy haul trains are required by operators and manufacturers to enable optimisation of train controls and rolling stock components. A new technology named train dynamics and energy analyser/train simulator （TDEAS） has been developed by the State Key Laboratory of Traction Power in China to perform detailed whole trip longitudinal train dynamics and energy analyses. Facilitated by a controller user interface and a graphic user interface, the TDEAS can also be used as a train driving simulator. This paper elaborates the modelling of three primary parts in the TDEAS, namely wagon connection systems, air brake systems and train energy components. TDEAS uses advanced wedge-spring draft gear models that can simulate a wider spectrum of friction draft gear behaviour. An effective and efficient air brake model that can simulate air brake systems in various train configurations has been integrated. In addition, TDEAS simulates the train energy on the basis of a detailed longitudinal train dynamics simulation, which enables a further perspective of the train energy composition and the overall energy consumption. To demonstrate the validity of the TDEAS, a case study was carried out on a 120-km-long Chinese railway. The results show that the employment of electric locomotives with regenerative braking could bring considerable energy benefits. Nearly 40 % of the locomotive energy usage could be collected from the dynamic brake system. Most of tractive energy was dissipated by propulsion resistance that accounted for 42.48 % of the total energy. Only a small amount of tractive energy was dissipated by curving resistance, air brake and draft gear systems.展开更多
文摘In recent years,significant development activity has been seen in battery electric and hydrogen locomotives.To fully understand the potential benefits of these zero-emission technologies and their application in locomotive design,a design study utilising a digital twin framework can be employed.While current research on the use of digital twins for battery and hydrogen-powered rail vehicles is limited,recent studies conducted at the Centre for Railway Engineering at CQUniversity indicate potential challenges with implementing standard 6-axle locomotives for zero-emission designs considering heavy haul operational needs and scenarios.These challenges are related to limitations in energy storage capacity and optimisation of train operation scenarios.By considering an 8-axle locomotive design concept and employing a digital twin framework in the design process,a more comprehensive assessment of conceptual development,design and requirements can be achieved.This will ensure the locomotive design meets standards,guidelines,and codes of practice,ultimately contributing to achieving net-zero emission goals in loco-motive traction.
文摘Whole trip longitudinal dynamics and energy analysis of heavy haul trains are required by operators and manufacturers to enable optimisation of train controls and rolling stock components. A new technology named train dynamics and energy analyser/train simulator （TDEAS） has been developed by the State Key Laboratory of Traction Power in China to perform detailed whole trip longitudinal train dynamics and energy analyses. Facilitated by a controller user interface and a graphic user interface, the TDEAS can also be used as a train driving simulator. This paper elaborates the modelling of three primary parts in the TDEAS, namely wagon connection systems, air brake systems and train energy components. TDEAS uses advanced wedge-spring draft gear models that can simulate a wider spectrum of friction draft gear behaviour. An effective and efficient air brake model that can simulate air brake systems in various train configurations has been integrated. In addition, TDEAS simulates the train energy on the basis of a detailed longitudinal train dynamics simulation, which enables a further perspective of the train energy composition and the overall energy consumption. To demonstrate the validity of the TDEAS, a case study was carried out on a 120-km-long Chinese railway. The results show that the employment of electric locomotives with regenerative braking could bring considerable energy benefits. Nearly 40 % of the locomotive energy usage could be collected from the dynamic brake system. Most of tractive energy was dissipated by propulsion resistance that accounted for 42.48 % of the total energy. Only a small amount of tractive energy was dissipated by curving resistance, air brake and draft gear systems.
