Study on safety boundary for high-speed train running in severe environments

Jin, Xuesong; Xiao, Xinbiao; Ling, Liang; Zhou, Li; Xiong, Jian

doi:10.1080/23248378.2013.790138

Cited by 52 publications

(26 citation statements)

References 18 publications

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“….8] < 50 ms) (Japanese National Railways (JNR)) (Yokose, 1966); (Wu and Wilson, 2006); (5) The bogie-side-sum L/V limit criterion ((L/V) B <0.6) (Wu and Wilson, 2006); (6) Prudhomme's criterion (transverse axle force) (F ys <10+P 0 /3, where P 0 is the static wheelset load) (Wilson et al, 2011); (7) The wheel load unloading ratio (V/V<0.8) (Jin et al, 2013); (8) The vehicle overturning coefficient (V D /V 0 < 0.8) (Jin et al, 2013); (9) The wheel rise (Z up ) limit with respect to the rail (Z up <28.272 mm) (Jin et al, 2013); (10) The lateral coordinate (y con ) limit of the wheel-rail contact point (−38.875 mm<y con <57.0 mm) (Jin et al, 2013).…”

Section: Methods For Safety Assessment Of Crosswindsmentioning

confidence: 99%

Study on the safety of operating high-speed railway vehicles subjected to crosswinds

Xiao

Ling

Xiong

et al. 2014

J. Zhejiang Univ. Sci. A

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Abstract:A coupled vehicle-track dynamic model is put forward for use in investigating the safety effects of crosswinds on the operation of a high-speed railway vehicle. In this model, the vehicle is modeled as a nonlinear multi-body system, and the ballasted track is modeled as a three-layer discrete elastic support system. The steady aerodynamic forces caused by crosswinds are modeled as ramp-shaped external forces being exerted on the vehicle body. This model was used in a numerical analysis of the dynamic response and dynamic derailment mechanisms of high-speed vehicles subjected to strong crosswinds. The effects of the crosswind speeds, crosswind attack angle, and vehicle speed on the operational safety of the vehicle were examined. The operational safety boundaries of a high-speed vehicle subjected to crosswinds were determined. The numerical results obtained indicate that crosswinds at attack angles of 75° to 90° with respect to the forward direction of the vehicle have a great influence on the safety of operating high-speed railway vehicles. The wheelset unloading limit, which determines the position of the warning boundary dividing the safe operating area and the warning area, is the most conservative, i.e., the safest, criterion to use in assessing the high-speed operational safety of vehicles in crosswinds.

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Section: Methods For Safety Assessment Of Crosswindsmentioning

confidence: 99%

Study on the safety of operating high-speed railway vehicles subjected to crosswinds

Xiao

Ling

Xiong

et al. 2014

J. Zhejiang Univ. Sci. A

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“…These models are mainly used for railway vehicle stability, comfort and safety assessment (Zhai et al, 2009). For a high-speed train, if the problems discussed in Section 1 are not included in the analysis, these models can also be used (Jin et al, 2013). However, in this case the interaction between the vehicles of the train is ignored.…”

Section: Train-track Coupling System Dynamic Modelmentioning

confidence: 99%

Key problems faced in high-speed train operation

Jin

2014

JZUS-A

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Jin / J Zhejiang Univ-Sci A (Appl Phys & Eng) 2014 15(12) Nov. 18, 2014; Crosschecked Nov. 19, 2014 Abstract: This paper discusses some key problems faced in high-speed train operation. These problems include: wheel tread concave wear causing the lateral oscillation of the train in operation, wheel roundness higher-order polygonal wear leading to fierce vertical vibration of wheel/rail and abnormal vibration noise of the coach interior of the train thus causing loosening and cracking of the train bogie parts, short pitch rail corrugation generation on the part of the track, fracture of cushion layer and road base fracture of the track, and increased noise inside and outside the train. At present, the mechanism of the occurrence and development of these phenomena is still not fully understood. This paper briefly reviews the related research on these problems in China and abroad, including many important recent papers and the articles published in this special issue. They make outstanding contributions to solving these problems, and include important work on train-track coupling large system theory, the relationship theory and technique of wheel/rail, and the vibration-noise reduction technology of the train.

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“…However, there are some problems including passenger riding comfort, noise pollution, and even operational safety (Jin et al, 2013). Rail corrugation, rail welding irregularity, wheel burning, and wheel out-of-roundness (OOR) generate high-frequency components of the dynamic wheel-rail contact forces that contribute significantly to the total wheel-rail contact forces (Nielsen et al, 2003), and reduce the life of the components of track and vehicle, such as wheels, rails, and fasteners.…”

Section: Introductionmentioning

confidence: 99%

Effect of the first two wheelset bending modes on wheel-rail contact behavior

Zhong

Jin

2014

JZUS-A

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Abstract:The objective of this paper is to develop a new wheel-rail contact model, which is suitable for considering the effect of wheelset bending deformation on wheel-rail contact behavior at high speeds. Dummies of the two half rigid wheelset are introduced to describe the spacial positions of the wheels of the deformed wheelset. In modeling the flexible wheelset, the first two wheelset bending modes are considered. Based on the modal synthesis method, these mode values of the wheelset axle are used to solve the motion equations of the flexible wheelset axle modeled as an Euler-Bernoulli beam. The wheel is assumed to be rigid and always perpendicular to the deformed axle at the wheel centre. In the vehicle model, two bogies and one car body are modeled as lumped masses. Spring-damper elements are adopted to model the primary and secondary suspension systems. The ballasted track is modeled as a triple layer discrete elastic supported model. Two high-speed vehicle-track models, one considering rigid wheelset models and the other considering flexible wheelset models, are used to analyze the differences of the numerical results of the two models in both frequency and time domains. In the simulation, a random high-speed railway track irregularity is used as wheel-rail excitations. Wheel-rail forces are calculated and analyzed in the time and frequency domains. The results clarify that this new contact model can characterize very well the influence of the first two bending modes of the wheelset on contact behavior.

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Study on safety boundary for high-speed train running in severe environments

Cited by 52 publications

References 18 publications

Study on the safety of operating high-speed railway vehicles subjected to crosswinds

Study on the safety of operating high-speed railway vehicles subjected to crosswinds

Key problems faced in high-speed train operation

Effect of the first two wheelset bending modes on wheel-rail contact behavior

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