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    Item type:Publication, Access status: with files ,
    Simulation-based analysis of conflicting objectives of quay cranes and terminal trucks at container terminals
    (Technische Universität Dresden, Fakultät Maschinenwesen, Institut für Technische Logistik und Arbeitssyste­me, Professur für Technische Logistik, 2025)
    Witte, Svenja
    ;
    Möhle, Florian
    ;
    Ilenburg, Simon
    ;
    Lödding, Hermann
    ;
    Jahn, Carlos
    Quay cranes are essential operating systems at container terminals. Their scheduling involves conflicting objectives, such as minimising vessel handling times, maximising productivity, and reducing the number of required terminal trucks. Logistic Operating Curves, known from production logistics, offer a suitable method for analysing such trade-offs and can be derived and validated through simulation. This paper proposes a simulation model of a container terminal to develop and parameterise characteristic Logistic Operating Curves. The analysis focuses on the conflict between quay cranes productivity and number of terminal trucks. Different assignment procedures for terminal truck are considered to examine their impact on system productivity.
    Publicationtype: Conference Paper
      64  23
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    Item type:Publication, Access status: with files ,
    Direct handling between vessels and trucks: skipping storage of containers at seaport terminals
    (Technische Universität Dresden, Professur für Technische Logistik, 2025-10-18)
    Nellen, Nicole
    ;
    Kastner, Marvin
    ;
    Jahn, Carlos
    Container yards are increasingly becoming bottlenecks at the terminals. To address this, new approaches are needed. One way to redesign processes at the terminal is the direct handling of containers on the seaside. This study employs a discrete-event simulation model to analyse the effects of delayed truck arrivals on quay crane productivity during direct handling between vessels and trucks. In this context, direct handling of containers refers to the loading and unloading of containers between vessels and trucks without intermediate storage in the container yard. A simulation model using Tecnomatix Plant Simulation replicates a terminal employing both conventional and direct handling, examining various truck delay scenarios. Results indicate that minor truck delays mildly affect quay crane productivity, whereas significant delays considerably diminish productivity, especially when a larger share of containers is handled directly. Although direct handling offers efficiency potential, delayed trucks pose significant planning challenges. Future research will aim to develop strategies to mitigate these impacts, such as flexible export container loading sequences.
    Publicationtype: Conference Paper
      29  17
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    Item type:Publication, Access status: with files ,
    Flexibilisation of intra-port container transport with time slot bookings
    (Technische Universität Dresden, Professur für Technische Logistik, 2025-10-20)
    Lange, Ann-Kathrin
    ;
    Grafelmann, Michaela
    ;
    Jahn, Carlos
    Truck appointment systems are a well-studied approach to reduce queues in front of container terminals and on their yard. Traditional systems are lacking in flexibility and tend to favour the terminal operators over other partners in the maritime supply chain. To enable a better fit of appointment systems to ports and to increase their flexibility, a systematic analysis of different parameters and strategies and their interdependencies is executed. The results show that longer time slots benefit terminal operators as well as trucking companies. Furthermore, the so-called flexibility options show some promise to increase efficiency with little extra effort. As there are many interdependencies, the parameters and strategies need to be chosen with care for every container terminal.
    Publicationtype: Conference Paper
      18  24
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    The effects of pre-arrival vessel prioritisation strategies for port call coordination
    (Technische Universität Dresden, Professur für Technische Logistik, 2025-10-21)
    Oberhauser Tavares Braga, João Pedro
    ;
    Kastner, Marvin
    ;
    Derin, Yasemin
    ;
    Jahn, Carlos
    This simulation study investigates the impacts of pre-arrival vessel prioritization strategies on port call coordination using a simulation model that integrates discrete-event and agent-based techniques. Motivated by the environmental and operational inefficiencies of the traditional first-come-first-served (FCFS) port policies, the simulation assesses how early and structured communication of arrival intentions, as first-announced-first-served (FAFS), can enhance berth allocation, improve resource utilization in the port, and reduce ship emissions. The model replicates a real port environment using empirical data and Python-based libraries evaluating multiple prioritization strategies under varying timing rules for port call announcements. Results demonstrate that structured pre-arrival announcements improve turnaround times and berth occupancy, particularly under strategies setting upper timing limits. However, results vary by terminal type and installed capacity. The findings underscore the need for improved digital infrastructure and cooperative governance to enable Just-in-Time (JIT) arrivals, highlighting the potential for simulation to support decision-making in port operations modernization.
    Publicationtype: Conference Paper
      55  28