Low Frequency Dynamic Vehicle/Track Interaction: Modelling and Simulation

Fröhling, Robert

doi:10.1080/00423119808969550

Cited by 46 publications

(20 citation statements)

References 2 publications

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“…The notions indicate that the track stiffness relates to the exciting frequency, which agrees with the conclusions of many literatures [52][53][54]. Other notions are based on the Winkler support model, which are not suitable for exploring deep information about track stiffness though they may solve some practical engineering problems.…”

Section: Inconsistent Measurement Conceptssupporting

confidence: 70%

Overview and outlook on railway track stiffness measurement

Wang

Chen

et al. 2016

J. Mod. Transport.

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Stiffness is one of the basic performance parameters for railway track. The efficient and accurate stiffness measurement has been considered as the foundation for further development of railway engineering, and therefore has great theoretical and practical significance. Based on a summary of the connotation and measurement of track stiffness, the state of the art of measurement methods for track stiffness was analyzed systematically. The standstill measurement of track stiffness can be performed with the traditional jack-loading method, impact hammer method, FWD (falling weight deflectometer) method, and track loading vehicle method. Although these methods can be adopted in stiffness measurement for a section of railway track, they are not desirable owning to small range and low efficiency. In the recent 20 years, researchers have proposed many methods like unbalancedloading laser displacement method, deflection basin deformation rate method, and eccentricity excitation method to continuously measure track stiffness; however, these methods have drawbacks like poor accuracy, low speed, and insufficient data analysis. In this work, the merits and demerits of these methods were summarized, and optimization suggestions were presented. Based on the wave transmission mechanism and principle of vibration energy harvesting, an overall conception on continuous measurement of stiffness and long-term stiffness monitoring for special sections was proposed.

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Section: Inconsistent Measurement Conceptssupporting

confidence: 70%

Overview and outlook on railway track stiffness measurement

Wang

Chen

et al. 2016

J. Mod. Transport.

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“…Since then, the related theory and research methods were widely adopted [36,37] and developed. Fröhling [38] connected the heavy-haul wagon model with the track settlement model together, and presented a method to predict the track settlement dynamic performance induced by the dynamic wheel load and the spatial variation of the track stiffness. Oscarsson and Dahlberg [39] developed a train-track-ballast model, in which the track parameters were determined by the test frequency response function.…”

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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“…The characteristics of stiffness and damping for the vehicle's model are linear. In other authors' works [6,9], the variable stiffness of the ballast was assumed, as well as a constant viscose damping along the road. Moreover, a logarithmic course of the track's settlement was accepted as function of the number of vehicle's passages.…”

Section: Expansion Of Track Vertical Irregularities Affected By a Sinmentioning

confidence: 99%

“…A modified formula was given by Froehling [6], basing on the experiment and a GEOTRACK software package. This formula has the form of ( )…”

Section: Track Settlement Simulationmentioning

confidence: 99%

“…The research indicates that deformations of the ballast layer contribute in a large extent to the track's settlement [4,5]. Froehling [6] in his paper on the causes of track's irregularities formation, points to the importance of the variable along the track of the vertical ballast's stiffness. There are assumed linear properties of the stiffness and damping for the ballast's layer.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of railway track deterioration influenced by ballast stiffness and dry friction

Droździel¹,

Sowiński²

2008

WIT Transactions on the Built Environment

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It is known, that track deterioration (loss of its geometry) strongly depends on track support conditions, particularly on the ballast. In this paper a novel approach is presented to predict the evolution of track vertical irregularities due to vehicle-track dynamic interaction taking into account ballast stiffness with dry friction. An applied vehicle-track model is composed of a railway car and a track. The track is assumed to be a discrete system having a series of inertial elements, which are elastically coupled. The vertical ballast stiffness may fluctuate along the track and its damping is described by dry friction with the friction force depending on wheelset loading. In the track model, initial irregularities may be introduced to initiate the process of track deterioration and vertical track irregularities expansion. Simulation results are evaluated for a series of rail car passing and referred to other results.

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Low Frequency Dynamic Vehicle/Track Interaction: Modelling and Simulation

Cited by 46 publications

References 2 publications

Overview and outlook on railway track stiffness measurement

Overview and outlook on railway track stiffness measurement

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

Simulation of railway track deterioration influenced by ballast stiffness and dry friction

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