Improved indirect measurement of the dynamic stiffness of a rail fastener and its dependence on load and frequency

Li, Qi; Dai, Baorui; Zhu, Zhihui; Thompson, D.J.

doi:10.1016/j.conbuildmat.2021.124588

Cited by 23 publications

(7 citation statements)

References 42 publications

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“…In [36] and [48], pseudo-random excitation has been used with a shaker. Moreover, excitation by an impact hammer is also used [48], [72]- [75].…”

Section: Three Standardized Measurement Methodsmentioning

confidence: 99%

“…This improved method was then used in [48], [72], [82], [83]. As well as the high frequency corrections described in Section 4.1.2, Li et al [36] further improved the method [69] at low frequencies by including an estimate of the support stiffness in the formulation. Gao et al [84] combined the direct and indirect methods to measure the vertical and transverse dynamic stiffness and loss factor of a rail fastener in the range 5-1250 Hz.…”

Section: Using Standardized Measurement Methodsmentioning

confidence: 99%

“…Constitutive models describe the stress-strain relationships of materials, while lumped parameter models describe the force-displacement relationships of resilient elements. As the former can be used as a basis for the latter, the force-displacement relationships of resilient elements are often written in forms that are analogous to the stress-strain relationships of their materials [36]- [38].…”

Section: Constitutive Relations and Global Behaviourmentioning

confidence: 99%

“…Large blocks are needed to achieve results at low frequency, and consequently they no longer behave as rigid bodies at higher frequencies. Li et al [36] investigated the preload-and frequency-dependence of the vertical dynamic stiffness behaviour of a rail fastener by improving the indirect method of [69]. Two modification factors were defined which were derived from a finite element model of the test rig to allow for the local vibration of the blocks in the 13 high frequency range and extend the upper frequency limit.…”

Section: Allowing For Lower Block Dynamicsmentioning

confidence: 99%

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Measurement, Modeling, and Analysis of the Dynamic Properties of Resilient Elements Used for Vibration Isolation

Sun,

Thompson

2023

Journal of Vibration and Acoustics

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Resilient elements are widely applied for vibration and noise control in many areas of engineering. Their complex dynamic stiffness gives fundamental information to describe their dynamic performance and is required for predicting structure-borne sound and vibration using dynamic modelling. Many laboratory measurement methods have been developed to determine the dynamic properties of resilient elements. This paper presents a review of recent developments of the measurement methods from the perspective of force-displacement relations of the resilient element assembly rather than of their material properties. To provide context, the review begins with an introduction to modelling methods for resilient elements, especially for rubber and rubber-like isolators, and three standardized measurement methods are introduced. Recent developments are then discussed including methods to extend the frequency range, which are mainly developments of the indirect method. Mobility methods, modal-based methods, recent active frequency-based substructuring (FBS) and inverse substructuring (IS) methods to study the dynamic properties of resilient elements are also described. Laboratory test rigs and the corresponding identification methods are outlined. Methods to evaluate nonlinear dynamic properties of resilient elements by laboratory measurements are also discussed. Finally, the review is concluded by discussing advantages and limitations of the existing methods and giving suggestions for future research.

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“…In [36] and [48], pseudo-random excitation has been used with a shaker. Moreover, excitation by an impact hammer is also used [48], [72]- [75].…”

Section: Three Standardized Measurement Methodsmentioning

confidence: 99%

Section: Using Standardized Measurement Methodsmentioning

confidence: 99%

Section: Constitutive Relations and Global Behaviourmentioning

confidence: 99%

Section: Allowing For Lower Block Dynamicsmentioning

confidence: 99%

See 2 more Smart Citations

Measurement, Modeling, and Analysis of the Dynamic Properties of Resilient Elements Used for Vibration Isolation

Sun,

Thompson

2023

Journal of Vibration and Acoustics

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“…This nonlinear characteristic of the rail pad, together with the non-linear elastic characteristic of the ballast and subgrade [ 5 , 7 , 8 ], determine the specific shape of the load-deformation curve of the track [ 9 , 10 , 11 , 12 ]. Additionally, the dynamic behaviour of the rail pad exhibits nonlinear aspects in terms of the frequency response function [ 3 , 13 , 14 , 15 , 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Parametric Study of the Influence of Nonlinear Elastic Characteristics of Rail Pads on Wheel–Rail Vibrations

2023

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The rail pad is the elastic element between the rail and the sleeper that has the role of absorbing the mechanical stresses from the rail and reducing the vibrations and shocks generated by wheel–rail interactions. In this paper, the problem of the influence of the variability of the nonlinear load-deformation characteristic of rail pads (resulting from the manufacturing process) on wheel–rail vibrations is investigated. The limit load-deformation characteristics of a manufactured rail pad and the medium load-deformation characteristic resulting as the arithmetic mean of the two are considered. The nonlinear load-deformation characteristic of the ballast is also considered. All these characteristics are approximated with the help of the bilinear function and are implemented in a track model consisting of an infinite Euler-Bernoulli beam placed on a two-elastic layer continuous foundation with inertial insertion, resulting in a model with an inhomogeneous foundation. The parameters of the inhomogeneous foundation are established from the equilibrium condition under a static load. Wheel–rail vibrations are studied in terms of the contact force and the acceleration of the rail and wheel. The influence of the variability of the elastic characteristics of the rail pad manifests itself in the field of medium frequencies, which amplify or attenuate the vibration levels in certain bands of one-third of an octave.

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An Analytical Model in Frequency Domain for Embedded Rail Systems

Faccini,

Castellini,

Alfi

et al. 2024

Lecture Notes in Mechanical Engineering

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Improved indirect measurement of the dynamic stiffness of a rail fastener and its dependence on load and frequency

Cited by 23 publications

References 42 publications

Measurement, Modeling, and Analysis of the Dynamic Properties of Resilient Elements Used for Vibration Isolation

Measurement, Modeling, and Analysis of the Dynamic Properties of Resilient Elements Used for Vibration Isolation

Parametric Study of the Influence of Nonlinear Elastic Characteristics of Rail Pads on Wheel–Rail Vibrations

An Analytical Model in Frequency Domain for Embedded Rail Systems

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