Developments of the Indirect Method for Measuring the High Frequency Dynamic Stiffness of Resilient Elements

Thompson, D.J.; Vliet, van Wj; Verheij, JW Jan

doi:10.1006/jsvi.1998.1492

Cited by 85 publications

(90 citation statements)

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“…As reported in [27], the measurements can differ depending on this load value. Moreover, the specimen must be placed between plates that force the behaviour to be one-dimensional.…”

Section: Experimental Measurementsmentioning

confidence: 88%

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The Role of Studs in the Sound Transmission of Double Walls

Poblet-Puig¹,

Ferran²,

Guigou‐Carter³

et al. 2009

Acta Acustica united with Acustica

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Steel studs are used in double walls to provide structural stability. This creates a vibration transmission path between leaves that can often be more critical than the airborne path through the cavity. Some of the existing models for sound transmission consider the studs as elastic springs. The spring stiffness may be taken as the cross-section elastic stiffness of the stud, but this leads to an underestimation of the vibration transmission. A procedure to obtain more accurate parameters to be used in vibration and sound insulation models is presented. The results show that they must be obtained from dynamic models and/or experiments.

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“…As reported in [27], the measurements can differ depending on this load value. Moreover, the specimen must be placed between plates that force the behaviour to be one-dimensional.…”

Section: Experimental Measurementsmentioning

confidence: 88%

“…The dynamic stiffness of resilient steel elements is measured by means of the indirect method in [27]. Some guidelines are proposed in order to increase the frequency range where the method is valid.…”

Section: Experimental Measurementsmentioning

confidence: 99%

The Role of Studs in the Sound Transmission of Double Walls

Poblet-Puig¹,

Ferran²,

Guigou‐Carter³

et al. 2009

Acta Acustica united with Acustica

View full text Add to dashboard Cite

show abstract

“…It is noted that some studies included a two-degree-of-freedom (2DOF) rail pad model [20][21][22]. With the exception of the work of Maes et al [11], which measured the input acceleration directly, the technique of 'indirect measurement' is generally utilised.…”

Section: Introductionmentioning

confidence: 99%

An Alternative Rail Pad Tester for Measuring Dynamic Properties of Rail Pads Under Large Preloads

Kaewunruen

Remennikov

2007

Exp Mech

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Kaewunruen, S. and Remennikov, A. M. (2008). An alternative rail pad tester for measuring dynamic properties of rail pads under large preloads. Experimental mechanics, 48 55-64. Abstract One of the main components in ballasted railway track systems is the rail pad. It is installed between the rail and the sleeper to attenuate wheel/rail interaction loads, preventing the underlying railway sleepers from excessive stress waves. Generally, the dynamic design of tracks relies on the available data, which are mostly focused on the structural condition at a specific toe load. Recent findings show that track irregularities could significantly amplify the loads on railway tracks. This phenomenon gives rise to a concern that the rail pads may experience higher effective preloading than anticipated in the past. On this ground, this paper highlights the significance of accounting for effects of preloading on dynamic properties of polymeric rail pads. An innovative test rig for controlling preloads on rail pads has been devised. A non-destructive methodology for evaluating and monitoring the dynamic properties of the rail pads has been developed based on an instrumented hammer impact technique and an equivalent single degreeof-freedom system approximation. Based on the impactexcitation responses, some of the selected rail pads have been tested to determine such modal parameters as dynamic stiffness and damping constants in the laboratory. The influence of large preloads on dynamic properties of both new and worn rail pads is demonstrated in this paper. Additionally, the design criteria, which has been used to take into account the influence of the level of preload on dynamic properties of generic rail pads, are discussed.

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“…A seventh degree polynomial was found to sufficiently describe the p 0 -u 0 relationship given in [5]. The values of the coefficients are k 1 = 20.00 kN/mm, k 3 = 3.94×10 3 kN/mm 3 , k 5 = -1.78×10 3 kN/mm 5 and k 7 = 3.2×10 3 kN/mm 7 , representing only stiffening load-deflection behaviour of the railpad.…”

Section: Static Stiffness Of Railpadsmentioning

confidence: 97%

Influence of Preload and Nonlinearity of Railpads on Vibration of Railway Tracks under Stationary and Moving Harmonic Loads

Koroma

Hussein

Owen

2015

Journal of Low Frequency Noise, Vibration and Active Control

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In railway track dynamics, the stiffness and damping properties of railpads have a significant effect on track vibration, decay rates as well forces transmitted to the track supporting structure. Many studies have shown that railpads exhibit pronounced nonlinear behaviour, with preload and frequency dependent properties. This paper presents a three parameter railpad model, together with its differential equation of motion and the required model parameters obtained from experimental data. A time domain model of a rail discretely supported on these railpads is then formulated using the finite element method. The model is subjected to static and dynamic loading in order to study the effects of preload and frequency on its dynamic behaviour. Results are shown as time histories and frequency spectra for the track displacements and reaction forces for various preload levels. They emphasise the necessity of accounting for nonlinear behaviour based on the large disparities (up to 20 dB) observed between the linear and nonlinear cases for the parameters used in this study.

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Developments of the Indirect Method for Measuring the High Frequency Dynamic Stiffness of Resilient Elements

Cited by 85 publications

References 0 publications

The Role of Studs in the Sound Transmission of Double Walls

The Role of Studs in the Sound Transmission of Double Walls

An Alternative Rail Pad Tester for Measuring Dynamic Properties of Rail Pads Under Large Preloads

Influence of Preload and Nonlinearity of Railpads on Vibration of Railway Tracks under Stationary and Moving Harmonic Loads

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