1,724,286 research outputs found
Dataset for A semi-analytical beam model for the vibration of railway tracks
No full textDataset containing all data from figures in the paper
Kostovasilis, Dimitrios, Thompson, David and Hussein, Mohammed (2016) A semi-analytical beam model for the vibration of railway tracks. Journal of Sound and Vibration (http://doi.org/10.1016/j.jsv.2016.12.033).</span
Thompson, David Arnold, 13673
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/421153Surname: THOMPSON. Given Name(s) or Initials: DAVID ARNOLD. Military Service Number or Last Known Location: 13673. Missing, Wounded and Prisoner of War Enquiry Card Index Number: 12807.245868
Item: [2016.0049.53414] "Thompson, David Arnold, 13673
Thompson, David S, NX51413
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/421261Surname: THOMPSON. Given Name(s) or Initials: DAVID S. Military Service Number or Last Known Location: NX51413. Missing, Wounded and Prisoner of War Enquiry Card Index Number: 15573.245976
Item: [2016.0049.53522] "Thompson, David S, NX51413
The effect of boundary conditions, model size and damping models in the finite element modelling of a moving load on a track/ground system
No full textThis record contains data for the article relating to the following abstract: An investigation is presented of the use of finite element models in the time domain to represent a load moving on a railway track on a flexible ground. A systematic study is carried out to compare different sizes and shapes of finite element mesh, different boundary conditions intended for suppressing reflections from the truncated model boundaries, and different models of soil damping. The purpose is to develop guidance to assist in selecting appropriate finite element models for moving load problems. To prevent reflections from the boundaries of the finite domain two approaches are compared. A 40 m radius hemispherical finite element mesh has been used first with infinite elements around the perimeter. This approach gives good results for a point harmonic load at the centre of the domain but some problems are highlighted when it is used for moving load calculations. An alternative approach has therefore been investigated based on a cuboid mesh. The base was fixed to prevent rigid-body motions of the model and, rather than use infinite elements at the sides, these were also fixed. It is shown that, provided that a suitable damping model is used, the spurious reflections from the sides of the model can be suppressed if the model is wide enough. On the other hand, if infinite elements are used, the calculations are found to be considerably more costly with little added benefit. Different models of soil damping are also compared. It is shown that a mass-proportional damping model gives a decay with distance that is independent of frequency, making it particularly suitable for this application. The length of model required to achieve steady state has been investigated. For a homogeneous half-space it is found that the required length increases considerably in the vicinity of the critical speed, up to 130 m in the present example, whereas for the layered ground a more modest length is sufficient for all speeds.
The article was published as Shih, Jou-Yi, Thompson, David and Zervos, Antonios (2016) The effect of boundary conditions, model size and damping models in the finite element modelling of a moving load on a track/ground system. Soil Dynamics and Earthquake Engineering, 89, 1-37.</span
Railway noise and vibration: mechanisms, modelling and means of control
No full textRailways are an environmentally friendly means of transport well suited to modern society. However, noise and vibration are key obstacles to further development of the railway networks for high-speed intercity traffic, for freight and for suburban metros and light-rail. All too often noise problems are dealt with inefficiently due to lack of understanding of the problem. This book brings together coverage of the theory of railway noise and vibration with practical applications of noise control technology at source to solve noise and vibration problems from railways
But are the trains getting any quieter?
No full textTo reduce railway noise effectively a good knowledge of the source mechanisms is first required. Wheel/rail interaction in particular results in a multiple source environment where wheels, rails and sleepers all play a role. This is a classic noise control problem where treatments will not be successful unless they take account of the relative importance of each source and apply appropriate measures for all the significant sources. Starting from theoretical research into source modelling, a number of practical techniques have been developed for reducing railway noise in the last 10-20 years, which will be discussed. While focussing on rolling noise, the related problems of curve squeal, bridge noise, aerodynamic noise and vehicle interior noise will also be mentioned. Finally it is recognised that the railway industry faces many pressures that make it reluctant to change, so the difficulties of practical implementation will be discussed
Railway noise and vibration: mechanisms, modelling and means of control
No full textRailway Noise and Vibration: Mechanisms, Modelling, and Means of Control, 2nd Edition provides a complete overview of the state of the art in rail noise and vibration theory and modelling.This book describes each source of noise and vibration, such as rolling noise, curve squeal, bridge noise, aerodynamic noise, ground vibration and ground-borne noise, and vehicle interior noise in a systematic way, covering relevant theoretical modelling approaches and their practical implementation, with extensive examples of noise control technology applied at source.Noise and vibration are key obstacles to further development of railway networks worldwide for high-speed intercity traffic, freight and suburban metros and light-rail systems. With noise problems all too often dealt with inefficiently due to a lack of understanding of the problem, this new edition is an invaluable reference for all those working with noise and vibration from railways, whether in industry, consultancy, or academic research
On track for a quieter future
No full textRailways around the world are experiencing a renaissance as an environmentally-friendly means of transport that offers many advantages for sustainable development. However proposals for new lines or expansions of networks are often met with objections based on noise and vibration. Although railway operations will never be silent, it is clearly important to minimise their noise and vibration while not adding unnecessary cost or complication to their construction and operation. To be able to propose cost-effective mitigation measures it is essential to understand the sources of noise and vibration and the parameters that can influence them. Theoretical models are an important part of this process. Such models should be of sufficient detail to cover the most relevant parameters in a reliable way, but not over-complicated in order not to lose insight. This approach of developing appropriate models for the purpose of designing mitigation measures is illustrated through several examples and case studies including rolling noise, ground vibration and aerodynamic noise
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