Neues verkehrswissenschaftliches Journal - Ausgabe 26

Author: Yong Cui
Publisher: BoD – Books on Demand
ISBN: 3752855207
Category : Technology & Engineering
Languages : en
Pages : 198

Book Description
Simulation methods are widely-used in the field of railway planning and operations. However, the various tools are all lacking with respect to the standards they utilise as well as their published interfaces. For an end-user, the basic mechanism and the assumptions built into a simulation tool are unknown, which means that the true potential of these software tools is limited. One of the most critical issues is the lack of the ability of users to define a sophisticated workflow, integrated in several rounds of simulation with adjustable parameters and settings. This book develops and describes a user-based, customisable platform. As the preconditions of the platform, the design aspects for modelling the components of a railway system and building the workflow of railway simulation are elaborated in detail. Based on the model and the workflow, an integrated simulation platform with open interfaces is developed. Users and researchers gain the ability to rapidly develop their own algorithms, supported by the tailored simulation process in a flexible manner. The productivity of using simulation tools for further evaluation and optimisation will be significantly improved through the user-adaptable open interfaces.

Neues verkehrswissenschaftliches Journal - Ausgabe 22

Author: Weiting Zhao
Publisher: BoD – Books on Demand
ISBN: 3746035015
Category : Technology & Engineering
Languages : en
Pages : 142

Book Description
With the increasing traffic demand and limited infrastructure expansion, railway operation becomes more susceptible to the operational disturbances. In order to ensure a robust railway operation, a proactive dispatching algorithm in dynamic circumstances under the consideration of random disturbances is necessary. In this study, an operational risk map will be firstly produced: by simulating considerable amount of disturbed scenarios generated in a Monte-Carlo scheme and calculating the corresponding expected negative impacts, different levels of operational risk will be assigned to each block section in the investigated network. Within a rolling time horizon framework, conflicts are detected with the inclusion of risk-oriented disturbances in each block section, and the near-optimal dispatching solutions are calculated by using Tabu search algorithm. Finally, three indicators including total weighted waiting time, the number of relative reordering and average absolute retiming, are chosen to testify the effectiveness and advantages of the proposed dispatching algorithm. The sensitivity analysis of dispatching-related parameters is conducted afterwards to investigate the most appropriate relevant parameters for the specific studied area. The proposed algorithms are expected to be capable of automatically producing near-optimal and robust dispatching solutions with sufficient punctuality achieved.

Neues verkehrswissenschaftliches Journal NVJ - Ausgabe 4

Author: Yong Cui
Publisher: BoD – Books on Demand
ISBN: 383917595X
Category :
Languages : en
Pages : 178

Book Description

Neues verkehrswissenschaftliches Journal - Ausgabe 18

Author: Jiajian Liang
Publisher: BoD – Books on Demand
ISBN: 3744840107
Category : Technology & Engineering
Languages : en
Pages : 190

Book Description
A railway system is a complex system. With the assistance of a railway operation control system, railway traffic is managed according to an operation plan. During the operation process, especially in railway networks with complex topology and high traffic flow, disturbances are likely to occur, which may result in severe deviations of train movements from the pre-designed operation plan. Once conflicts have occurred or potential conflicts between trains have been detected, suitable dispatching actions should be executed to minimize the negative impacts of the disturbances. In order to support dispatchers, a dispatching optimization algorithm was developed in this dissertation. In the development of dispatching models, two aspects need be considered: modelling of railway operation and the dispatching optimization algorithm. The former is indispensable to accurately assess the impact of disturbances, and the latter is employed to find solutions with minimal impact. In order to balance accuracy and computation complexity a multi-scale simulation model was developed in this dissertation. Dispatching optimization is a typical combinatorial optimization problem, and exhaustive search becomes impractical when there is a large set of possible dispatching solutions. To speed up the search, a widely used metaheuristic algorithm-tabu search - was adopted as the basis of the dispatching optimization algorithm. This dissertation addressed both multi-scale simulation and dispatching optimization in railway operation.

Neues verkehrswissenschaftliches Journal - Ausgabe 19

Author: Di Liu
Publisher: BoD – Books on Demand
ISBN: 3744841030
Category : Technology & Engineering
Languages : en
Pages : 202

Book Description
Rail-bound transport in urban areas plays an important role in public transport. Given its urban setting, urban rail-bound transport can be significantly influenced by the interfering road traffic around it. Considering the capacity and operation quality of urban rail-bound transport influenced by road traffic in various urban mixed traffic zones, it'very important to investigate and include the road traffic influences for capacity research on urban rail-bound transport. In this dissertation, two approaches are developed to model the road traffic influences according to the analysis of the interactions between urban mixed traffic in various mixed traffic zones. As an important intermediate result, the newly-developed waiting time function is determined to adapt to an urban rail-bound system with consideration of external influences. Furthermore, an algorithm is developed in the model with an event-driven system to simulate the interactions among urban mixed traffic in various mixed traffic zones. This algorithm is used to assess the significance of mixed traffic impacts and derive the primary results for capacity research.

Demography and Infrastructure

Author: Tobias Kronenberg
Publisher: Springer Science & Business Media
ISBN: 9400704585
Category : Business & Economics
Languages : en
Pages : 259

Book Description
Population ageing has been going on for many decades, but population shrinking is a rather new phenomenon. The population of Germany, as in many other countries, has passed a plateau and is currently shrinking. Demographic change is a challenge for infrastructure planning due to the longevity of infrastructure capital and the need to match supply and demand in order to ensure cost-efficiency. This book summarises the findings of the INFRADEM project team, a multidisciplinary research group that worked together to estimate the effects of demographic change on infrastructure demand. Economists, engineers and geographers present studies from top-down and bottom-up perspectives, focusing on Germany and two selected regions: Hamburg and Mecklenburg-Western Pomerania. The contributors employed a broad range of methods, including an overlapping-generations model for Germany, regional input-output models, an energy systems model, and a spatial model of the transportation infrastructure.

Railway Timetabling & Operations

Author: Ingo A. Hansen
Publisher:
ISBN: 9783777104621
Category :
Languages : en
Pages : 330

Book Description

Urban Sprawl

Author: Gregory D. Squires
Publisher: The Urban Insitute
ISBN: 9780877667094
Category : Political Science
Languages : en
Pages : 384

Book Description
Urban Sprawl is not simply a development that undercuts the quality of life for suburbanites. It has raised alarms across the nation, as fair housing advocates, environmentalists, land use planners, and even many suburban employers who cannot find the workers they need, have recognized that the costs go far beyond aesthetics. Despite the agreement that something needs to be done, there is no consensus on what works. Urban Sprawl: Causes, Consequences, and Policy Responses assembles leading scholars who analyze the major causes and consequences of urban sprawl and the policy initiatives that are being explored in response to these developments.

Railway Track Engineering

Author: J. S. Mundrey
Publisher: Tata McGraw-Hill Education
ISBN: 9780070680128
Category : Railroad engineering
Languages : en
Pages : 0

Book Description
Railway Track Engineering presents conventional methods of track construction, maintenance and monitoring, along with modern sophisticated track machines. It also comprehensively covers design details and specifications of important track componentsChanges in the revised edition include:Explanation of the hitherto little understood phenomenon of rolling contact fatigue in rails and practical steps to deal with it. New technology of alumino-thermic rail welding. New guidelines for ultrasonic rail flaw detection. Ballastless track for metros, mainlines and washable aprons. Track standards for ultra high-speed lines in India. Track structure for Dedicated Freight Corridors. Technology of fully mechanized track construction with the deployment of simple track laying equipment to highly sophisticated track-laying trains.Richly illustrated with photographs and line drawings, this book will be useful to professionals and students.

ICE Manual of Highway Design and Management

Author: Ian Walsh
Publisher: ICE Publishing
ISBN: 9780727741110
Category : Technology & Engineering
Languages : en
Pages : 0

Book Description
This manual is a one-stop reference for all practising engineers working in the field of highway engineering.