Safety of high-speed train passing by windbreak breach with different sizes

Sun, Zhuang; Dai, Huanyun; Hemida, Hassan; Li, Tian; Huang, Chen

doi:10.1080/00423114.2019.1657909

Cited by 18 publications

(35 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The aerodynamic models in the references of Sun et al. 1,2 are show in Figure 1(a) and (b), respectively. There were two gaps between the two windbreak walls and the boundaries shown in Figure 1(a), excluding the windbreak breach.…”

Section: Simulation Modelmentioning

confidence: 99%

“…Meanwhile, Sun et al. 2 researched the safety of the train passing by different sizes of windbreak breach with constant wind speed of 32 m/s and train speed of 120 km/h, respectively. It turned out that although the short windbreak breach produced the highest wind speed it gave the lowest wind loads compared to the longer breach.…”

Section: Introductionmentioning

confidence: 99%

“…Sun et al. 1,2 proved when the train passed by a equivalent windbreak breach of 12 m that the tested phenomena could be reproduced, in which the wind loads were called the gust. The duration of the wind loads is about 0.71 s, which is close to the natural periods of the train suspension system.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dynamic response of a high-speed train under a type of gust with different durations

Sun

Dai

Gui

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part F:

Self Cite

View full text Add to dashboard Cite

In order to study the effect of different gust durations on the safety of a high-speed train passing by a wind-break breach at a speed of 120 km/h, the root locus method is used to analyze the suspension modes of the train under different speeds. The original gust is obtained based on the Unsteady Reynolds-averaged Navier-Stokes (URANS) model when the train passes by a 12 m breach between two windbreaks with a normal crosswind speed of 32 m/s. A group of scaling factors for stretching and compressing the time windows is applied to change the gust duration without changing the amplitude. The results show that when the gust duration is close to the natural period of the suspension system, the train responses and derailment coefficient of the train can be amplified. As the attack angles of the first and second wheelset are still in the clockwise direction when overlooking the wheelset, the first wheelset is more vulnerable than the second wheelset. When the gust duration is longer than the natural period of lower sway, the initial fluctuation of the train response can be relieved.

show abstract

Section: Simulation Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dynamic response of a high-speed train under a type of gust with different durations

Sun

Dai

Gui

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part F:

Self Cite

View full text Add to dashboard Cite

show abstract

“…• Aerodynamics Zhuang Sun measured the wind force acting on a train when it passed by a windbreak breach, and studied the effects according to the gap size of the windbreak breach through simulations [11]. Mulugeta Biadgo Asress carried out simulations on the ICE 2 high-speed train for a range of various yaw angles to compare with wind tunnel test data, and evaluated the changes of wind flows according to the yaw angles through simulation [12].…”

Section: Introductionmentioning

confidence: 99%

Prediction of Theoretical Derailments Caused by Cross-Winds with Frequency

2021

View full text Add to dashboard Cite

In this paper, theoretical derailment equations for cross-wind with frequency were derived to assess running safety. For a KTX (Korean high-speed train) unit, the wheel unloading ratios, which are the criteria for evaluating derailments in UIC (International union of railways) and TSI (Technical Specification for Interoperability) regulations, were calculated through the formula under the driving regulations according to cross-wind speeds, and the theoretical results were compared and evaluated through a multibody dynamics (MBD) simulation. In addition, the wheel unloading ratios were calculated for various frequencies of cross-winds. As a result of the formula and MBD, the wheel unloading ratios were shown to increase rapidly regardless of the dampers in suspension when the cross-wind frequency and the natural frequency of a vehicle were in agreement. Finally, we calculated the changes of wheel unloading ratio for different track gauges and found that these theoretical equations could calculate more accurate results than the existing Kunieda’s formula. The formula derived in this study has the advantage of considering various variables, such as fluctuant cross-winds, rail irregularities, and derailment behaviors, which were not considered in previous studies or Kunieda’s formula. It could be used for setting suspensions or railway vehicle specifications in the initial design stage.

show abstract

“…Similarly, windbreak types and their effectiveness on bridges (Guo et al, 2015;He et al, 2019;Zhang, Gao, et al, 2013;Zhang, Xia, et al, 2013), embankments (Avila-Sanchez et al, 2010Gao & Duan, 2011) and flat ground (Hashmi et al, 2019;Yang et al, 2011;Zhang et al, 2017;Zhang, He, et al, 2019) have been studied to protect trains. In addition, due to the effects of the terrain, wind-reducing facilities are discontinuous and sometimes generate transition areas between different landforms, such as the windbreak transition induced by a regular windbreak and an open-hole tunnel or between a cutting and an embankment, bridge, or a tunnel (Deng et al, 2019;Sun et al, 2019Sun et al, , 2020Wang, 2010). In this windbreak transition region, due to the sudden structural shape change, the original wind-reducing ability is weakened, and there is a strong wind impact on the train (Chen et al, 2019;Liu et al, 2018;Xu et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical research on wind characteristics affected by actual mountain ridges and windbreaks: a case study of the Lanzhou-Xinjiang high-speed railway

Chen

Liu

et al. 2020

Engineering Applications of Computational Fluid Mechanics

View full text Add to dashboard Cite

To reduce the impact of a mountain ridge on the crosswind flow field of a specific section of the Lanzhou-Xinjiang high-speed railway, a portion of the mountain ridge was removed to increase the distance from the windbreak. To verify the effects of this flow optimization measure, the wind speed and wind angle were tested in this mountain ridge region. In this paper, under the actual conditions of this specific case study, the average and transient wind characteristics were analyzed based on the test results. Then, based on the actual terrain model, using the computational fluid dynamics (CFD) method with two inlet boundary conditions, namely, constant wind and exponential wind, the results obtained from the two boundary conditions were validated. Furthermore, the visualized flow structures and wind speed distributions along the railway under both boundary conditions were compared. Finally, along the railway, the impacts of different terrain types on the flow field of the railway were compared.

show abstract

Safety of high-speed train passing by windbreak breach with different sizes

Cited by 18 publications

References 17 publications

Dynamic response of a high-speed train under a type of gust with different durations

Dynamic response of a high-speed train under a type of gust with different durations

Prediction of Theoretical Derailments Caused by Cross-Winds with Frequency

Experimental and numerical research on wind characteristics affected by actual mountain ridges and windbreaks: a case study of the Lanzhou-Xinjiang high-speed railway

Contact Info

Product

Resources

About