Study on Transmission Characteristics of Vertical Rail Vibrations in Ballast Track

Sheng, Xi; Zhao, Caiyou; Wang, Ping; Liu, Dongya

doi:10.1155/2017/5872419

Cited by 10 publications

(8 citation statements)

References 22 publications

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“…Shortpitch rail corrugation found in the railway line between Belfast and Steelpoort corresponds to a low frequency range of vibration [1]. Furthermore, it is in a low frequency range that the horizontal vibration is predominantly transmitted downwards [21]. At higher frequencies the vibrations are understood to be transmitted along the rail.…”

Section: Resultsmentioning

confidence: 99%

Train Wheels Eigenmodes on Effects of Vibration and Track Deterioration in the Belfast to Steelpoort Railway Line

Balekwa

Kallon

2021

MATEC Web Conf.

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In South Africa, one of the main lines situated in its Limpopo Province presents symptoms of excessive vehicle-track vibrations. A modal method is adopted to study the difference in dynamic response of corrugated rails resting on the Hytrel/6385 and High Density Polyethylene (HDPE) rail pads. The results for dynamic response of rails on these two types of rail pads are analysed in form of Frequency Response Functions (FRFs). Two positions are considered in obtaining these point FRFs; those are mid-span and on top of sleeper. Resonance modes of significance are excited in a frequency range of 0 – 500Hz on rails resting on both types of rail pads. In view of the entire vibration response window, the FRFs show a more damped vibration response by rail resting on the HDPE than that resting on the Hytrel/6358 rail pad. A Finite Element (FE) modal analysis method is used to investigate vibration mode shapes and corresponding frequencies of the wheelset used by the locomotive operating in the line. In the high frequency range of 350 – 500Hz, the gear-side wheel of a locomotive wheelset proves to be vibrating more erratically than the non-gear side wheel. Clearly pronounced mode shape excited at a frequency of 350Hz and higher are presented.

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Section: Resultsmentioning

confidence: 99%

Train Wheels Eigenmodes on Effects of Vibration and Track Deterioration in the Belfast to Steelpoort Railway Line

Balekwa

Kallon

2021

MATEC Web Conf.

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“…where k 1 and k 2 are the wavenumbers. The derivation of S t (ω) has been demonstrated in the previous work [16], which is omitted in this paper. F t is the input determined by the external loads.…”

Section: Spectral Element Methodsmentioning

confidence: 99%

“…To build the transfer relation between two ends, the STMM should be improved by removing unnecessary degrees of freedom in the middle of the model. Recently, the SEM and the STMM have been adopted to study the transmission characteristics of vertical rail vibrations in the ballast track [16].…”

Section: Introductionmentioning

confidence: 99%

Influence of Vertical Fastener Stiffness on Rail Sound Power Characteristics: Numerical Study and Field Measurement

2020

Self Cite

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The aim of this paper is to investigate the influence of vertical fastener stiffness on the sound power characteristics of rail rolling noise. The rail mobility is obtained by using the Timoshenko-beam track model and the spectral element method. The decay rate is obtained by using the periodic track model and the spectral transfer matrix method. Then, the simulation results of the rail mobility and the decay rate are used to calculate the sound power level of the rail subjected to a harmonic point excitation. Furthermore, the influence of vertical fastener stiffness on the rail sound power level is investigated. Finally, field measurements of the rail accelerance and the decay rate are performed to verify the accuracy of models and calculation methods. The results show that the sound power level of the rail subjected to a harmonic point excitation increases with the increase of the frequency and peaks at the center frequency of 800 Hz. When the vertical fastener stiffness decreases from 50 kN/mm, the rail sound power level below the center frequency of 200 Hz gets increased. The increase of the sound power level is most significant at the center frequency which is close to the decreased vertical rail resonance frequency, because in the corresponding one-third octave band the rail mobility amplitude increases significantly while the decay rate decreases considerably. The simulations of the rail accelerance and the decay rate both coincide well with the measurements.

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“…Recently, vibration control strategies based on such local resonances were used to filter the propagation of undesired waves in metamaterial beams 13,14 , rods 15 , shafts 16,17 and piping systems 8 . Moreover, vibration transmission behavior in the vertical and lateral direction of railway tracks like the one depicted in Figure 1, were investigated by many researchers [18][19][20][21][22][23] . Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Flexural Band Gaps and Vibration Control of a Periodic Railway Track

Iqbal

Kumar

Jaya

et al. 2021

Preprint

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Periodic structures exhibit unique band gap characteristics by virtue of which they behave as vibro-acoustic filters thereby allowing only waves within a certain frequency range to pass through. In this paper, both lateral and vertical flexural wave propagation and vibration control of a periodic railway track are studied in depth. More precisely, a rail fastened on rigid sleeper blocks is modeled with an Euler-Bernoulli beam. The dispersion relations in both lateral and vertical directions are obtained using the Floquet-Bloch theorem and the resulting dispersion curves are verified using finite element (FE) models. Afterwards, tuned mass dampers (TMDs) with different mass ratios are designed to control vibrations of the examined rail along both lateral and vertical directions. Moreover, the influence of damping of rail and resonators on band structures is investigated. As a replacement to the conventional TMD, a novel possibility to control vibrations relies on using another rail as a lateral distributed resonator (LDR). Although the effectiveness of LDR is lower than that of localized resonators, the former represents a simple and promising way to control vibrations. Efficacy of the proposed control methods is finally verified using the results of transient simulation based on a random Gaussian white noise input.

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Study on Transmission Characteristics of Vertical Rail Vibrations in Ballast Track

Cited by 10 publications

References 22 publications

Train Wheels Eigenmodes on Effects of Vibration and Track Deterioration in the Belfast to Steelpoort Railway Line

Train Wheels Eigenmodes on Effects of Vibration and Track Deterioration in the Belfast to Steelpoort Railway Line

Influence of Vertical Fastener Stiffness on Rail Sound Power Characteristics: Numerical Study and Field Measurement

Flexural Band Gaps and Vibration Control of a Periodic Railway Track

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