Effect of uncertainty of fastening systems properties on wheel/rail dynamic force

Sadeghi, Javad; Seyedkazemi, Mohammad; Khajehdezfuly, Amin

doi:10.1590/1679-78256537

Cited by 4 publications

(4 citation statements)

References 48 publications

(105 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 2(a) shows the comparison of the fastener dynamic stiffness results of the P-T model and the laboratory measurement data. In the figure, three different fastener stiffness data, considering the preloads under the working condition, are used to verify the P-T model, 9,10 and their static stiffness are, respectively, 6 kN/mm, 75 kN/mm, and 280 kN/mm. 12 It is difficult to accurately obtain the dynamic damping value of the fastener in a laboratory.…”

Section: Track Model With Frequency-dependent Stiffness and Damping O...mentioning

confidence: 99%

“…In fact, the rail pad inserting in the fastener is made of rubber. Laboratory measurements of the fastener dynamic stiffness has showed that the stiffness and damping of it could be affected by the external excitation frequency, environmental temperature, preload generated by the clips 8 and the uncertainty of fastening system, 9 and in turn influence the vibration and noise radiation of the track, [10][11][12][13][14] and the specific impact of each variable is strongly material-dependant. 15 In order to have a better understanding of the effect of the fastener dynamic properties on vehicle/track dynamic performance, various fastener models were proposed.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of dynamic stiffness of fasteners on vibration and acoustic radiation of a ballastless track

Han

Xiao

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part F:

View full text Add to dashboard Cite

A new model for a single wheel rolling over a metro ballastless track is developed. It is used to carry out the analysis on the effect of dynamic characteristics of fastener on the vibration and noise radiation of the wheel and the track in the vertical direction, under the excitation of the wheel/rail uneven surfaces in detail. In this analysis, a rail is modeled as a Timoshenko beam resting on discrete rubber booted short sleepers, and the sleepers are connected with the slab through linear springs and damping units, the slab is modeled by using the FE method, the fastener is characterized by using the Poynting-Thomson model which takes into account that the stiffness and dumping of the fasteners vary with vibration frequency in their service. The dynamic characteristics of the fastener include the variation of its stiffness and damping with frequency. The analysis considers that the fastener dynamic stiffness increases with the excitation frequency while its damping decreases. The vibration and acoustic radiation of the wheel/track is, to varying degree, affected by the dynamic property of the fastener. The vibration and acoustic radiation of the sleeper and the slab is greatly affected by the dynamic property of the fastener. But the effect of the total noise level of the wheel and the track by the dynamic property of the fastener is not so large because the wheel and rail noise is dominant in the whole analyzed system. These conclusions have certain reference values for the study of the vibration and noise reduction measures of the wheel and track coupled system using the fastening characteristic.

show abstract

Section: Track Model With Frequency-dependent Stiffness and Damping O...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of dynamic stiffness of fasteners on vibration and acoustic radiation of a ballastless track

Han

Xiao

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part F:

View full text Add to dashboard Cite

show abstract

“…The large differences in the vibration response induced by the trains at the same position lead to an effect of uncertainty that cannot be ignored. Therefore, researchers have recently carried out many studies, using a large number of experimental methods to analyse the uncertainty associated with the vibration source intensity [17,18], the finite element method to analyse the effect of uncertainty generated by the fastening system's properties on the wheel-rail force [19], and the stochastic field theory to analyse the uncertainty of the soil propagation system [20]. At the same time, machine learning methods have been used to analyse the characteristics and sources of uncertainty in the environmental vibrations induced by the metro [21,22].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Vibration Responses Induced by Metro Operations Using a Probabilistic Method

Wu,

Li,

Liu

et al. 2024

Symmetry

View full text Add to dashboard Cite

The environmental vibrations of tunnels and soil caused by metro operations is one of the most important issues in the field of environmental geotechnical engineering. Recent studies in metro-induced vibrations have revealed significant uncertainties in the vibration responses of tunnels and the surrounding soil. A two-step method of obtaining train loads considering uncertainty was introduced. The first step was to obtain the train loads via an inverse model based on measurements, and the second step was to quantify the uncertainty of train loads based on complex principal component analysis. A portion of a tunnel of the Beijing metro was selected as the object of study, where the vertical accelerations on the rail and on the tunnel wall were measured under different train speeds of 35, 45 and 55 km/h. Inputting the train loads based on the measured rail accelerations into an axisymmetric numerical model, established using ANSYS, the vibration responses of the tunnel wall in a probabilistic framework were calculated and were compared with the measured results. By using an accuracy index that considers both calculation bias and uncertainty, the accuracy of the calculated vibration response was quantitatively evaluated. It can be concluded that the calculated vibration response can reflect the actual vibration level and uncertainty of the tunnel wall. The accuracies of the calculated results under different speeds were generally high while showing a slight difference in amplitude.

show abstract

“…Other related studies can be seen in Refs. [13][14][15][16][17][18]. However, when considering the influence of fastening failure in the curved track on train-track dynamics, most of the present studies only considered the fastening failure in ballasted track, and few studies have studied the same problem in slab track.…”

Section: Introductionmentioning

confidence: 99%

Reduced-order modeling of train-curved-slab-track dynamics with the effects of fastening failures

Liu

Yang

et al. 2022

Acta Mech. Sin.

View full text Add to dashboard Cite

Fastening failures have frequently been found on China high-speed railway curved tracks in recent years. Thus the influence of fastening failures on high-speed train-track interaction in curved track needs to be analyzed. A train-curved slab track interaction model is built, in which the real shape of the curved rail is considered and modeled with reduced beam model (RBM) and curved beam theory, and the slabs are modeled with four-nodes Kirchhoff-Love plate elements. The present model is validated at first with different traditional models. Then the influence of fastening failure in curved slab track on train-track interaction dynamics is studied. A different number of failed fastenings is assumed to occur at the curved track, and different types of fastening failure including the fatigue fracture of the clip structure and failure of the rail pad are considered. Based on the calculation results, the fatigue fracture of the clip structure has little influence on train-track interaction dynamics. But when rail pad failure happens and its equivalent vertical stiffness and damping are less than one-tenth of its original, the fastening failure seriously affects the highspeed train operation safety, and it must be prevented.

show abstract

Effect of uncertainty of fastening systems properties on wheel/rail dynamic force

Cited by 4 publications

References 48 publications

Effect of dynamic stiffness of fasteners on vibration and acoustic radiation of a ballastless track

Effect of dynamic stiffness of fasteners on vibration and acoustic radiation of a ballastless track

Analysis of Vibration Responses Induced by Metro Operations Using a Probabilistic Method

Reduced-order modeling of train-curved-slab-track dynamics with the effects of fastening failures

Contact Info

Product

Resources

About