Under sleeper pads—Influence on dynamic train–track interaction

Johansson, Anders; Nielsen, Jens C. O.; Bolmsvik, Rikard; Karlström, Anders; Lundén, Roger

doi:10.1016/j.wear.2008.02.032

Cited by 86 publications

(54 citation statements)

References 4 publications

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“…Numerical work on USPs includes a parametric characterisation study on the influence of rail pad stiffness, USP stiffness and the stiffness of the ballast and subgrade on dynamic aspects of vehicle-track interaction (Johansson et al 2008). The study concluded that the selection of USP properties with the aim of enhancing track performance will be a compromise between reducing vibration magnitudes in the superstructure on the one hand and vibration magnitudes in the substructure on the other hand.…”

Section: The Effects Of Under-sleeper Pads On Sleeper-ballast Interacmentioning

confidence: 99%

The effects of under-sleeper pads on sleeper-ballast interaction

Gräbe

Mtshotana

Sebati³

et al. 2016

J. S. Afr. Inst. Civ. Eng.

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Under-sleeper pads (USPs), typically made from polyurethane, are used by railways in certain parts of the world to reduce ballast settlement and consequently lengthen the ballast tamping cycle. The rationale behind this relatively new addition to the conventional ballasted track structure is that the pad increases the contact area between the angular ballast particles and the underside of the concrete sleeper, with the effect that ballast breakdown and total track settlement are reduced. This paper describes two experiments on the effects of USPs on four aspects of sleeper-ballast interaction, namely contact area, contact pressure, ballast settlement and ballast breakdown. Static and dynamic tests up to 1 million loading cycles were performed under controlled laboratory conditions on concrete sleepers with and without USPs. Sophisticated pressure sensors revealed an increase in contact area from 12% to 35% for static loading tests, and from 8% to 20% for dynamic tests, with a resulting 70% reduction in contact pressure. In addition, a 44% reduction in ballast settlement and a 23% reduction in ballast breakdown were achieved by the introduction of USPs. In conclusion it is argued that the introduction of USPs specifically on heavy-haul lines would offer significant advantages with respect to ballast settlement and breakdown. These advantages are most likely to lengthen general ballast tamping and screening cycles, resulting in significant life cycle cost savings.

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Section: The Effects Of Under-sleeper Pads On Sleeper-ballast Interacmentioning

confidence: 99%

The effects of under-sleeper pads on sleeper-ballast interaction

Gräbe

Mtshotana

Sebati³

et al. 2016

J. S. Afr. Inst. Civ. Eng.

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“…Based on the vehicle-track coupled dynamics model, Sun and Simson [45,46] considered the torsional and bending modes of wheelset elasticity, and studied the relations between the rail corrugation and the factors of wheel-rail stick-slip vibration, wheelset torsional vibration and track vibration. Johansson et al [47] investigated the effects of under sleeper pad properties on the wheel-rail dynamic interactions in the time and frequency domains. Oyarzabal et al [48] developed a 3-D track model and a simplified FEM vehicle model consisting of the wheelset, brake disc and axle-box, which were used to optimise the parameters to reduce the rail corrugation development.…”

Section: Introductionmentioning

confidence: 99%

Establishment and verification of three-dimensional dynamic model for heavy-haul train–track coupled system

Liu

Zhai

Wang

2016

Vehicle System Dynamics

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For the long heavy-haul train, the basic principles of the intervehicle interaction and train-track dynamic interaction are analysed firstly. Based on the theories of train longitudinal dynamics and vehicle-track coupled dynamics, a three-dimensional (3-D) dynamic model of the heavy-haul train-track coupled system is established through a modularised method. Specifically, this model includes the subsystems such as the train control, the vehicle, the wheel-rail relation and the line geometries. And for the calculation of the wheel-rail interaction force under the driving or braking conditions, the large creep phenomenon that may occur within the wheel-rail contact patch is considered. For the coupler and draft gear system, the coupler forces in three directions and the coupler lateral tilt angles in curves are calculated. Then, according to the characteristics of the long heavy-haul train, an efficient solving method is developed to improve the computational efficiency for such a large system. Some basic principles which should be followed in order to meet the requirement of calculation accuracy are determined. Finally, the 3-D train-track coupled model is verified by comparing the calculated results with the running test results. It is indicated that the proposed dynamic model could simulate the dynamic performance of the heavy-haul train well. ARTICLE HISTORY

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“…Johansson et al [29] investigated the effect of pads on dynamic train-track interactions and their results showed that under sleeper pads reduces vibration of rail and sleepers and they are usually effective at frequencies below 250 Hz.…”

Section: Track Based Solutionsmentioning

confidence: 99%

A Review on the Current Methods of Railway Induced Vibration Attenuations

Moghaddam¹

2017

IJSEA

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Railway ground borne vibration is a major problem for high-speed and intercity trains. This problem causes many environmental as well as financial problems for railway companies. In the past decades, there have been numerous methods and strategies to avoid the excessive vibration from vehicles. Many of these methods have been tested and used in tracks and surrounding structures while others are still theories. This paper intends to discuss the current practice in railway vibration reduction and the effectiveness of each method for the different track, vehicle and structures. The methods are divided into three groups; in track, in the path and at the destination solutions. For each category, the results from state-of-the-art research and practice have been presented and conclusion on the appropriate methods and strategies for each case has been made.

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Under sleeper pads—Influence on dynamic train–track interaction

Cited by 86 publications

References 4 publications

The effects of under-sleeper pads on sleeper-ballast interaction

The effects of under-sleeper pads on sleeper-ballast interaction

Establishment and verification of three-dimensional dynamic model for heavy-haul train–track coupled system

A Review on the Current Methods of Railway Induced Vibration Attenuations

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