Results for "Modelling and Simulation" : Scipedia

Collection of open reports in transport research

Optimizing departure times in vehicle routes

Abstract

Most solution methods for the vehicle routing problem with time windows (VRPTW) develop routes from the earliest feasible departure time. However, in practice, temporal traffic congestions make that such solutions are not optimal with respect to minimizing the total duty time. Furthermore, [...]

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Collection of open reports in transport research

Vehicle routing under time-dependent travel times: The impact of congestion avoidance

Abstract

Daily traffic congestions form major problems for businesses such as logistical service providers and distribution firms. They cause late arrivals at customers and additional hiring costs for the truck drivers. The additional costs of traffic congestions can be reduced by taking into [...]

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Collection of open conferences in research transport

An offshore energy simulation through flow networks: CEL within the MSP Challenge 2050 simulation game platform

Abstract

This paper presents the design of the offshore energy simulation CEL as a flow network, and its integration in the MSP Challenge 2050 simulation game platform. This platform is designed to aid learning about the key characteristics and complexity of marine or maritime spatial planning [...]

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Collection of open conferences in research transport

Routing a mix of conventional, plug-in hybrid, and electric vehicles

Abstract

International audience; We introduce an electric vehicle routing problem combining conventional, plug-in hybrid, and electric vehicles. Electric vehicles are constrained in their service range by their battery capacity, and may require time-consuming recharging operations at some [...]

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Collection of open conferences in research transport

Automatic fitting procedure for the fundamental diagram

Abstract

The fundamental diagram of a road, including free flow capacity and queue discharge rate, is very important for traffic engineering purposes. In the real word, most traffic measurements come from stationary loop detectors. This paper proposes a method to fit Wu’s fundamental diagram [...]

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Collection of open conferences in research transport

An offshore energy simulation through flow networks: CEL within the MSP Challenge 2050 simulation game platform

Abstract

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Collection of open conferences in research transport

Instantaneous Incident Detection System Based on Analysis of Acoustic Signal from Crash and Skid in Tunnel

Abstract

Introduction:"/jats:title""jats:p"An acoustic signal-based tunnel accident detection system was developed in this study. In a tunnel environment, the sound diffusion effect is minimized and thanks to that, discrimination of accident sounds (crash and skid) from other noises can apparently be accomplished."/jats:p""/jats:sec""jats:sec""jats:title"Discussion:"/jats:title""jats:p"The system is composed of three parts: algorithm, field device, and center system. To distinguish accident-related acoustic signals such as a crash or skid among various other sounds in a tunnel, a delicate algorithm that can discriminate those signals from other normal signals generated from moving vehicles was created."/jats:p""/jats:sec""jats:sec""jats:title"Conclusion:"/jats:title""jats:p"The developed algorithm processes acoustic signals to filter out noises and to identify accident-related signals. The field device, installed in a tunnel, collects analog sounds, transforms them into digital signals, and transmits the digital signals to the server in the tunnel traffic management center. Lastly, in the tunnel traffic management center, the acoustic signal processing algorithm described above, installed in a server system, can instantaneously detect accidents. Once confirmed by the system operators, the information on the detected accidents is intended to be provided to drivers following behind as well as relevant agencies to prevent secondary accidents and to respond promptly. The developed system was evaluated in a real tunnel environment using traffic accident sounds acquired from real crash tests. The detection rates were 95, 91, and 80% at distances of 10, 30, and 50 m, respectively with a detection duration less than 1.4 s. Compared to conventional detection systems using loop detectors or video images that have a long detection time of around 1 min, the developed system can be regarded as superior in that it has an extremely short detection time, which, of course, is one of the most important factors for automatic incident detection systems."/jats:p""/jats:sec

Abstract

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Collection of closed conferences in transport research

Evaluation of safety indicators for truck platooning

Abstract

This paper addresses safety indicators for truck platooning at short inter-vehicle distances (with a time gap of 0.5 s). The aim of a safety indicator is to determine the correct moment for initiating a Collision Avoidance brake action to prevent a collision with the preceding [...]

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Collection of closed conferences in transport research

Integrated trajectory control and collision avoidance for automated driving

Abstract

This paper presents a method for trajectory control, based on feedback linearization to guide an Automatic Guided Vehicle (AGV). The novelty of this work, is the adaptation of a reference trajectory with respect to a desired velocity in real-time to avoid collisions using a time-scaling [...]

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Collection of open articles in transport research

Application of the Expanded Theory of Planned Behavior in Intercity Travel Behavior

Abstract

Congestion in intercity corridors of metropolitan area has been increasing steadily. To alleviate congestion, many major investment projects, such as the high speed railway projects, were proposed by agency. To evaluate the adequacy and efficiency of these projects, the intercity [...]

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