A Laboratory Test on the Vibration Mitigation Efficiency of Floating Ladder Tracks

Ma, Meng; Jiang, Bolong; Li, Minghang; X, Sun

doi:10.1016/j.proeng.2017.09.570

Cited by 5 publications

(7 citation statements)

References 8 publications

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“…Toll et al (Töll, Achs et al 2018) verified the performance of a FST System after 20 Years of Service. Similar works on FST systems were conducted by Ma et al (Ma, Jiang et al 2017) and Zhao et al (Zhao and Ping 2018). A summary of stiffness variations of FST systems used in European countries was done by International Union of Railways (UIC 2008).…”

Section: Introductionmentioning

confidence: 79%

Effectiveness of track stiffness reduction in attenuation of metro induced vibrations received by historical buildings

Sadeghi

Esmaeili

2018

Lat. Am. j. solids struct.

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Preservation of historical buildings is a main challenge in civil engineering field. One of the main concerns in this regard is metro induced vibration received by historical structures. There is a need to evaluate effectiveness of vibration mitigation measures in preservation of monumental buildings. The most widely used method of reducing metro vibrations is changes in the structure of the vibration source (not sufficiently investigated in the literature). In response to this need, effectiveness of track stiffness reduction in mitigation of vibration was investigated in this research. Comprehensive field tests were conducted in the Iranian metro lines. The track stiffness as well as the induced vibrations were measured. It was shown that track stiffness has noticeable role in the track levels of vibration, and in turn in metro vibration reduction. The amounts of vibration reduction were derived as a function of track stiffness reduction.

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Section: Introductionmentioning

confidence: 79%

Effectiveness of track stiffness reduction in attenuation of metro induced vibrations received by historical buildings

Sadeghi

Esmaeili

2018

Lat. Am. j. solids struct.

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“…[21] Xu [20] Liu et al [17], Jia et al [18] High resilient rail fastener Fang et al [19] Twin-block booted sleepers Gao et al [22], He and Yang [23] Ladder sleeper track Yan et al [25], Jin et al [26] Ma et al [27] Xia et al [24] FST with steel spring Ma et al [3], Zhai et al [28], Ding et al [29] Ma et al [3], Liu et al [17], Jia et al [18] FST with rubber bearing Yuan et al [30] FST + tuned slab damper/mass block Xu [20], Zhu et al [31,32],…”

Section: Sketch Measures On the Track Theoretical And Numerical Study...mentioning

confidence: 99%

“…Table 1 summarizes existing research on different types of vibration-isolating tracks. The elastic element can be inserted under the rail [17][18][19][20][21], the sleeper [22][23][24][25][26][27], and the whole slab track [3,17,18,[28][29][30]. The track's natural frequency decreases with the decrease of the elastic element stiffness or increase in floating masses above the elastic elements.…”

Section: Introductionmentioning

confidence: 99%

Control of Metro Train-Induced Vibrations in a Laboratory Using Periodic Piles

Jiang

Liu

et al. 2020

Sustainability

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Laboratories with sensitive instruments need a low-vibration environment. It is a challenge to control the train-induced vibration impact on these instruments when a newly planned metro line is adjacent to a laboratory building. An alternative method of mitigating train-induced ground vibrations involves installing measures along the transmission path. Recent research has highlighted the potential of periodic pile barriers with specifically designed band gaps for controlling environmental vibrations. This study performed in-situ measurements of ambient vibrations inside and outside a laboratory containing various types of sensitive instruments and located adjacent to a newly designed metro line. The vibration transfer function of the laboratory was then obtained. To help design and optimize the band gaps of periodic piles, a novel band gap performance evaluation function was proposed. Finally, numerical analysis was conducted to validate the mitigation effect of the designed periodic piles. The results showed that the band gap performance evaluation function can be used to optimize the mitigation effect of periodic piles. The proposed periodic piles clearly attenuated vibrations between 52.4 and 74.3 Hz, especially those at 63 Hz. A comparison of general vibration criteria (VC) curves revealed that vibration attenuation of one level can be obtained by the designed periodic piles.

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“…To model the moving train effect in the laboratory, the multi-point asynchronous loading method was applied by employing large scale and special loading equipment (Garburg et al., 2013; Bian et al., 2014). On the preload problem, whether the elastic element is under preload has an obvious influence on its dynamic and vibration mitigation performance (Garburg et al., 2013; Ma et al., 2017a). Then, it is suggested that the applied preload should be as close as possible to actual axle loads.…”

Section: Introductionmentioning

confidence: 99%

“…Carman and LaBonte (1994) applied preload by unsprung mass and static load to the track when testing the reduction effect of the FST. Ma et al. (2017a) investigated the quantitative relationship between the preload mass and IL in the laboratory, but the maximum preload mass was only 8 t, much smaller than the actual axial load.…”

Section: Introductionmentioning

confidence: 99%

Influence of static preload on vibration reduction effect of floating slab tracks

Liu

et al. 2018

Journal of Vibration and Control

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To effectively reduce the railway vibration and its environmental impact, vibration mitigation measures are increasingly used. The vibration reduction effect of railway tracks is described quantitatively by insertion loss (IL). ILs obtained from in situ measurements under moving train loads and laboratory tests under artificial excitation differ significantly due to the different track loading state between these two methods. The differences of track loading state are induced by the moving effect of train passages and the preloads effect of vehicle masses, the latter of which is a significant factor to discuss in this paper. In order to study the static preload by vehicle masses influence on the vibration reduction effect in isolated tracks, the steel spring floating slab track and regular slab track, as a reference case, were compared. First, a theoretical simplified model was constructed, following which a finite–infinite element coupled model was built, which was calibrated by experimental test results. Impact loads were applied to both tracks with preloads using unsprung wheelsets or sprung vehicle-body masses, with the total mass varying from 0 t to 30 t. The results demonstrate that the increase in preload of unsprung mass makes the natural frequencies further reduced, and the peak IL value increased from 39 dB to 48 dB. The increase in preload has a significant effect on vibration responses below 5 Hz, and the application of the preload has different effects on the reduction effect in different frequency ranges.

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A Laboratory Test on the Vibration Mitigation Efficiency of Floating Ladder Tracks

Cited by 5 publications

References 8 publications

Effectiveness of track stiffness reduction in attenuation of metro induced vibrations received by historical buildings

Effectiveness of track stiffness reduction in attenuation of metro induced vibrations received by historical buildings

Control of Metro Train-Induced Vibrations in a Laboratory Using Periodic Piles

Influence of static preload on vibration reduction effect of floating slab tracks

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