Systems Thinking Approach for Rail Freight Noise Mitigation

Kaewunruen, Sakdirat

doi:10.1007/s40857-016-0052-9

Cited by 6 publications

(2 citation statements)

References 8 publications

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“…However, further studies into dynamic and falling frictions are needed for investigations since the wheel/rail friction is not constant in reality. 35…”

Section: Resultsmentioning

confidence: 99%

Spectro-Temporal Responses of Curved Railway Tracks with Variable Radii of Arc Curves

Kaewunruen

Ngamkhanong

Liu

2019

Int. J. Str. Stab. Dyn.

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On curved railway tracks, wheel/rail interface can usually cause a traveling source of sound and vibration, which constitutes high-pitch or tonal noise pollution causing considerable concern to rail asset owners, commuters and people living or working along the railway corridor. The sound and vibration can be in various forms and spectra. The undesirable tonal sound on curves caused by excessive lateral wheel/rail dynamics in resonance with falling friction states are often called ‘squeal noises’. This paper evaluates the transient effect of curve radii on the possible occurrence of lateral track resonances, which is a principal cause of dynamic wheel/rail mode coupling that could trigger ‘curve squeal’. This study is devoted to systems thinking approach and better insight into dynamic phenomena of railway tracks that could resolve the railway curve noise problems. Curved track models in three-dimensional space have been developed using a finite element package, STRAND7. The dynamic responses of curved track have been simulated by applying a moving train load. The transient loading model of a common wheel/rail slip has been adopted. The simulations of railway tracks with different curve radii have been carried out to develop state-of-the-art understanding of lateral track dynamics, including rail dynamics, cant dynamics and overall track responses. Parametric studies have been conducted to evaluate lateral displacements, velocities and accelerations of rail over sleeper and rail at midspan, both in static and dynamic conditions. The study firstly reveals that the lateral resonance of tangent tracks is relatively rare and the mode coupling behavior is unlikely to occur on moderately curved tracks. The lateral vibration responses have been presented in terms of time histories and spectro-temporal responses (also called “Spectogram”). The dynamic lateral responses of the track are found to be sensitive to the change of curved radii. The resonance peak in the lateral direction is related to the agreement of corresponding natural frequencies of rail and the vibration excitation frequencies under an individual rolling velocity. The outcome of this study establishes new insight into the dominant influences of different track parameters to track lateral dynamic behaviors.

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“…However, further studies into dynamic and falling frictions are needed for investigations since the wheel/rail friction is not constant in reality. 35…”

Section: Resultsmentioning

confidence: 99%

Spectro-Temporal Responses of Curved Railway Tracks with Variable Radii of Arc Curves

Kaewunruen

Ngamkhanong

Liu

2019

Int. J. Str. Stab. Dyn.

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“…Although many methods for vibration mitigation at source or propagation path have been tested and applied, lesser scale of research with respect to metamaterials applications in vibration abatements have been conducted [11][12][13]. Metamaterials are artificially constructed materials, which have repeated patterns in the configuration.…”

Section: Introductionmentioning

confidence: 99%

Sustainability of Vibration Mitigation Methods Using Meta-Materials/Structures along Railway Corridors Exposed to Adverse Weather Conditions

Kaewunruen

Qin

2020

Sustainability

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Noises and vibrations caused by operating transport systems can seriously affect people’s health and environmental ecosystems. Railway-induced vibrations in urban settings can cause disturbances and damages to surrounding buildings, infrastructures and residents. Over many decades, a number of mitigation methods have been proposed to attenuate vibrations at the source, in the transmission path, or at the receiver. In fact, low-frequency or ground-borne vibration is turned out to be more difficult to be mitigated at source, whilst some attenuation measures in propagation path can be applicable. To broaden the mitigating range at the low-frequency band, the applications of meta-materials/structures have been established. In railway systems, periodic structures or resonators can be installed near the protected buildings to isolate the vibrations. Despite a large number of proposed attenuation methods, the sustainability of those methods has not been determined. Based on rational engineering assumptions, the discounted cash flows in construction and maintenance processes are analysed in this study to evaluate lifecycle costs and the quantity of materials and fuels, as well as the amount of carbon emissions. This study is the world’s first to identify the efficacy and sustainability of some transmission path attenuation methods in both normal and adverse weather conditions. It reveals that geofoam trenches and wave impeding blocks are the most suitable methods. Although metamaterial applications can significantly mitigate a wider range of lower frequency vibrations, the total cost and carbon emissions are relatively high. It is necessary to significantly modify design parameters in order to enable low-cost and low-carbon meta-materials/structures in reality.

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Life cycle analysis of mitigation methodologies for railway rolling noise and groundbourne vibration

Tuler

Kaewunruen

2017

Journal of Environmental Management

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Systems Thinking Approach for Rail Freight Noise Mitigation

Cited by 6 publications

References 8 publications

Spectro-Temporal Responses of Curved Railway Tracks with Variable Radii of Arc Curves

Spectro-Temporal Responses of Curved Railway Tracks with Variable Radii of Arc Curves

Sustainability of Vibration Mitigation Methods Using Meta-Materials/Structures along Railway Corridors Exposed to Adverse Weather Conditions

Life cycle analysis of mitigation methodologies for railway rolling noise and groundbourne vibration

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