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Transport Engineering

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  • Article
    Chao Shu, Yue Bao, Ziyou Gao, Zaihan Gao
    Engineering, 2025, 46(3): 316-330. https://doi.org/10.1016/j.eng.2024.12.001

    Vehicle electrification, an important method for reducing carbon emissions from road transport, has been promoted globally. In this study, we analyze how individuals adapt to this transition in transportation and its subsequent impact on urban structure. Considering the varying travel costs associated with electric and fuel vehicles, we analyze the dynamic choices of households concerning house locations and vehicle types in a two-dimensional monocentric city. A spatial equilibrium is developed to model the interactions between urban density, vehicle age and vehicle type. An agent-based microeconomic residential choice model dynamically coupled with a house rent market is developed to analyze household choices of home locations and vehicle energy types, considering vehicle ages and competition for public charging piles. Key findings from our proposed models show that the proportion of electric vehicles (EVs) peaks at over 50% by the end of the first scrappage period, accompanied by more than a 40% increase in commuting distance and time compared to the scenario with only fuel vehicles. Simulation experiments on a theoretical grid indicate that heterogeneity-induced residential segregation can lead to urban sprawl and congestion. Furthermore, households with EVs tend to be located farther from the city center, and an increase in EV ownership contributes to urban expansion. Our study provides insights into how individuals adapt to EV transitions and the resulting impacts on home locations and land use changes. It offers a novel perspective on the dynamic interactions between EV adoption and urban development.

  • Review
    Yun Wei, Xin Yang, Xiao Xiao, Zhiao Ma, Tianlei Zhu, Fei Dou, Jianjun Wu, Anthony Chen, Ziyou Gao
    Engineering, 2024, 41(10): 7-18. https://doi.org/10.1016/j.eng.2024.01.022

    As the scale of urban rail transit (URT) networks expands, the study of URT resilience is essential for safe and efficient operations. This paper presents a comprehensive review of URT resilience and highlights potential trends and directions for future research. First, URT resilience is defined by three primary abilities: absorption, resistance, and recovery, and four properties: robustness, vulnerability, rapidity, and redundancy. Then, the metrics and assessment approaches for URT resilience were summarized. The metrics are divided into three categories: topology-based, characteristic-based, and performance-based, and the assessment methods are divided into four categories: topological, simulation, optimization, and data-driven. Comparisons of various metrics and assessment approaches revealed that the current research trend in URT resilience is increasingly favoring the integration of traditional methods, such as conventional complex network analysis and operations optimization theory, with new techniques like big data and intelligent computing technology, to accurately assess URT resilience. Finally, five potential trends and directions for future research were identified: analyzing resilience based on multisource data, optimizing train diagram in multiple scenarios, accurate response to passenger demand through new technologies, coupling and optimizing passenger and traffic flows, and optimal line design.

  • Article
    Ziling Zeng, Shuaian Wang, Xiaobo Qu
    Engineering, 2023, 21(2): 45-60. https://doi.org/10.1016/j.eng.2022.07.019

    Despite rapid advances in urban transit electrification, the progress of systematic planning and management of the electric bus (EB) fleet is falling behind. In this research, the fundamental issues affecting the nascent EB system are first reviewed, including charging station deployment, battery sizing, bus scheduling, and life-cycle analysis. At present, EB systems are planned and operated in a sequential manner, with bus scheduling occurring after the bus fleet and infrastructure have been deployed, resulting in low resource utilization or waste. We propose a mixed-integer programming model to consolidate charging station deployment and bus fleet management with the lowest possible life-cycle costs (LCCs), consisting of ownership, operation, maintenance, and emissions expenses, thereby narrowing the gap between optimal
    planning and operations. A tailored branch-and-price approach is further introduced to reduce the computational effort required for finding optimal solutions. Analytical results of a real-world case show that, compared with the current bus operational strategies and charging station layout, the LCC of one bus line can be decreased significantly by 30.4%. The proposed research not only performs life-cycle analysis but also provides transport authorities and operators with reliable charger deployment and bus schedules for single- and multi-line services, both of which are critical requirements for decision support in future transit systems with high electrification penetration, helping to accelerate the transition to sustainable mobility.