Influence of the operational conditions on static and dynamic stiffness of rail pads

Sainz-Aja, José; Carrascal, I.; Ferreño, Diego; Pombo, João; Casado, Julio; Diego, Soraya

doi:10.1016/j.mechmat.2020.103505

Cited by 39 publications

(46 citation statements)

References 27 publications

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“…Cezary et al tested the frequency dependence of UBM and used an FDZ model to evaluate its insertion loss in a two-layer reference system [ 20 ]. In addition to the more well-known frequency dependence, temperature dependence, and amplitude dependence of the polymer materials [ 21 , 22 , 23 , 24 , 25 , 26 , 27 ], the influence of the preload dependence is now being considered. Koroma et al successively proposed the modified KV model [ 28 ] and the Poynting–Thomson (PT) model [ 29 ] considering the preload dependence, which fit better with the measured dynamic stiffness of the fastener pad under different preloads [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Evaluation Method of the Vibration Reduction Effect Considering the Real Load- and Frequency-Dependent Stiffness of Slab-Track Mats

et al. 2021

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The purpose of this research was to investigate and improve the accuracy of the existing slab-track mat (STM) specifications in the evaluation of the vibration reduction effect. The static nonlinearity and dynamic mechanical characteristics of three types of STMs were tested, and then a modified fractional derivative Poynting–Thomson (FDPT) model was used to characterize the preload and frequency dependence. A modified vehicle–floating slab track (FST) coupled dynamic model was established to analyze the actual insertion loss. The insertion loss error evaluated by the frequency-dependent tangent stiffness increased with the increase in STM nonlinearity, and the error obtained by the third preload tangent stiffness was usually greater than that of the second preload. Compared with the secant stiffness, the second preload frequency-dependent tangent stiffness was more suitable for evaluating STMs with high-static–low-dynamics (HSLD) stiffness. In order to reflect the frequency dependence effect and facilitate engineering applications, it is recommended that second preload tangent stiffness corresponding to the natural frequency of the FST be used for evaluation. Furthermore, the insertion loss of the STMs with monotonically increased stiffness decreased as the axle load increased, and the opposite was true for the STMs with monotonically decreased stiffness. The vibration isolation efficiency of the STMs with HSLD stiffness was both stable and better than that of the STMs with monotonic stiffness.

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Section: Introductionmentioning

confidence: 99%

Evaluation Method of the Vibration Reduction Effect Considering the Real Load- and Frequency-Dependent Stiffness of Slab-Track Mats

et al. 2021

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“…The discrete element method allows to simulate the sophisticated dynamic behaviour of the stone components of the ballast bed [6]. [8] The rail pads play an important role in the wheel/rail dynamics because they are the closest elastic elements to the wheel/rail contact patch. The rail pads are assembled between the steel rails and sleepers to distribute the wheel/rail load over a large surface avoiding the resultant fatigue and shock stresses.…”

Section: Introductionmentioning

confidence: 99%

“…The rail pads are assembled between the steel rails and sleepers to distribute the wheel/rail load over a large surface avoiding the resultant fatigue and shock stresses. Usually, the rail pads are made of rubber, ethylene propylene diene monomer (EPDM), thermoplastic polyester elastomer (TPE), high-density polyethylene (HDPE), and ethylene-vinyl acetate (EVA), as presented in Figure 2 [7,8]. Such materials are well known in industry and these are extensively studied from many view points to solve various practical issues [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Track Model with Nonlinear Elastic Characteristic of the Rubber Rail Pad

Mazilu¹,

Arsene²,

Cruceanu³

2021

Mater. Plast.

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This paper presents a new basic nonlinear track model consisting of an infinite Euler-Bernoulli beam (rail) resting on continuous foundation with two elastic layers (rail pad and ballast bed) and intermediate inertial layer (sleepers). The two elastic layers have bilinear elastic characteristic obtained from the load-displacement characteristic of the rail pad and ballast. A time-varying load with two components - time-constant one and harmonic other, representing the wheel/rail contact force is considered as the track model input. Rail deflection due to the time-constant component of the load is obtained solving the nonlinear equations of the balance position. Subsequently, the structure of the nonhomogeneous foundation is determined. Dynamic rail response in terms of receptance due to the harmonic component of the load is calculated using the linearised track model with nonhomogeneous elastic characteristic. Influence of the time-constant component and the reflected waves due to the nonhomogeneous foundation are presented.

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“…For example, the dynamic performance and long-term behaviour of concrete slab and ballasted tracks were studied through full-scale model tests with simulated train moving loads. [47][48][49][50][51][52][53][54][55] The study of the interaction between the vehicle and the track consists of the solution of the contact between the wheels and the rails. [56][57][58][59][60][61][62][63] This issue plays a key role since it not only affects the motion of the vehicle but also allows to study the effect of track irregularities, [64][65][66][67] the prediction of some damaging phenomena such as wear, [68][69][70][71][72][73][74][75] rolling contact fatigue 76,77 or corrugation [78][79][80] and other track singularities.…”

Section: Introductionmentioning

confidence: 99%

Impact of rail infrastructure maintenance conditions on the vehicle-track interaction loads

Ariaudo¹,

Verardi²,

Pombo

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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The rail infrastructure and the track components are expensive assets with long life spans and high maintenance costs. The cost efficiency, performance and punctuality of train operations heavily depend on the track conditions. Ideally, the railway track would be completely smooth providing continuous support to the rolling stock running on it. In practice, however, the infrastructure cannot be installed without irregularities. These defects will increase over time due to the service loads imposed by the railway vehicles. The aim of this work is to use advanced computational tools to predict how the vehicles will respond to changing levels of track defects. For this purpose, the track and its maintenance conditions are characterized in realistic operation scenarios and modelled with detail in order to enable studying the interaction loads that are imposed to the vehicles by the track conditions. The presented methodology enables to identify the track health indexes that have higher influence on the dynamic loads transmitted to the rolling stock. It was observed that the track layout, track irregularities and degradation of the rails have the larger influence on the vehicle-track interaction loads with consequences in terms of safety and maintenance costs. In this way, this work contributes to the development of solutions with technological relevance, giving answer to the industry’s most recent needs in terms of reducing the maintenance costs and decreasing the incidents that cause traffic disruptions, contributing to improve the competitiveness of the railway transport.

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Influence of the operational conditions on static and dynamic stiffness of rail pads

Cited by 39 publications

References 27 publications

Evaluation Method of the Vibration Reduction Effect Considering the Real Load- and Frequency-Dependent Stiffness of Slab-Track Mats

Evaluation Method of the Vibration Reduction Effect Considering the Real Load- and Frequency-Dependent Stiffness of Slab-Track Mats

Track Model with Nonlinear Elastic Characteristic of the Rubber Rail Pad

Impact of rail infrastructure maintenance conditions on the vehicle-track interaction loads

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