Numerical and experimental characterization of the mechanical behavior of a new recycled elastomer for vibration isolation in railway applications

Diego, Soraya; Casado, Julio; Carrascal, I.; Ferreño, Diego; Cardona, Joan; Villamarín, Robert Arcos

doi:10.1016/j.conbuildmat.2016.12.115

Cited by 28 publications

(16 citation statements)

References 9 publications

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“…However, the high density rail transit network and the fast operating speed inevitably cause more obvious environmental vibrations and noise problems [ 1 ]. A common measure to decrease noise emissions and vibrations involves the installation of resilient elements in the railway track [ 2 , 3 ], such as rail pads [ 4 ], under-sleeper pads (USM) [ 5 ], under-ballast mats (UBM) [ 6 ], crumb rubber [ 7 ], and slab-track mats (STMs) [ 8 , 9 , 10 ]. The damping pad floating slab track (DPFST), one of the best measures to reduce vibrations, has been widely used as the main track structure type in the vibration reduction demand area of Guangzhou (160 km/h URT).…”

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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“…This process is often associated with the need to meet increasing requirements regarding the durability and recycling of structures, as well as the protection of people and the environment against traffic noise and vibrations. The implementation of the research and analyses aimed at quantifying the mechanical properties of modern building materials is, thus, a key issue from scientific, engineering, social, and environmental points of view [ 1 , 2 , 3 , 4 , 5 , 6 ]. Products made of synthetic materials constitute a wide group of modern materials used more and more often in transport infrastructure.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Fatigue Test on the Mechanical Properties of the Cellular Polyurethane Mats Used in Tram and Railway Tracks

et al. 2021

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The use of modern synthetic materials is an important element in the development of railway tracks. Their use is a response to the growing requirements regarding the durability of structures and environmental protection against traffic noise and vibrations. In this paper, the results of the laboratory tests of selected mechanical properties of cellular polyurethane (PUR) mats which are applied in tram and railway tracks are presented in this study. The aim of the research was to determine the effect of fatigue loading on the mechanical performance of polyurethane mats. A series of samples made of two types of materials with different pore structures were tested. Static and fatigue laboratory tests were carried out on a specially prepared test stand. The values of selected mechanical parameters (the vertical static bedding modulus, the vertical dynamic bedding modulus, and the loss factor) were evaluated. The results of laboratory tests and analyses showed a significant influence of high-cycle fatigue loading on the values of mechanical parameters of the tested mats, which were quantified as a result of the study. For both types of materials, the phenomenon of cyclic hardening was observed. Additionally, for one of the materials, an undesired dynamic creep phenomenon was observed. It was also shown that the pore structure of polyurethane influences the mechanical performance of the mats. Therefore, the findings of the research may have practical significance for the quality evaluation of such materials, especially in the context of their durability and mechanical stability under real loading conditions.

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“…Elastomeric materials are widely used as vibration control components in several types of structures. Some interesting applications can be found, for example, in railway tracks, where components such as rail pads or ballast mats are often implemented to mitigate railway-induced ground-borne vibrations [1][2][3]. Prior to its implementation, the isolation efficiency of a potential solution is often assessed using prediction methods.…”

Section: Introductionmentioning

confidence: 99%

An Efficient Experimental Methodology for the Assessment of the Dynamic Behaviour of Resilient Elements

et al. 2020

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The assessment of the dynamic behaviour of resilient elements can be performed using the indirect method as described in the standard ISO 10846-3. This paper presents a methodology for control the error on the estimation of the frequency response functions (FRF) required for the application of the indirect method when sweep sine excitation is used. Based on a simulation process, this methodology allows for the design of the sweep sine excitation parameters, i.e., the sweep rate and the force amplitude, to control three types of errors associated to the experimentally obtained FRF in the presence of background noise: a general error of the FRF in a selected frequency range, and the errors associated to the amplitude and the frequency of the FRF resonance peak. The signal processing method used can be also tested with this methodology. The methodology has been tested in the characterisation of two different resilient elements: an elastomer and a coil spring. The simulated error estimations has been found to be in good agreement with the errors found in the measured FRF. Furthermore, it is found that for large signal-to-noise ratios, both sweep rate and force amplitude significantly affect the FRF estimation error, while, for small signal-to-noise ratios, only the force amplitude can control the error efficiently. The current methodology is specially interesting for laboratory test rigs highly used for the dynamic characterisation of resilient elements which are required to operate efficiently, since it can be used for minimising test times and providing quality assurance. Moreover, the application of this methodology would be specially relevant when characterisation is done in noisy environments.

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Numerical and experimental characterization of the mechanical behavior of a new recycled elastomer for vibration isolation in railway applications

Cited by 28 publications

References 9 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

The Effect of Fatigue Test on the Mechanical Properties of the Cellular Polyurethane Mats Used in Tram and Railway Tracks

An Efficient Experimental Methodology for the Assessment of the Dynamic Behaviour of Resilient Elements

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