Overturning Probability of Railway Vehicles under Wind Gust Loads

Proppe, Carsten; Wetzel, Christian

doi:10.1007/978-1-4020-6332-9_3

Cited by 8 publications

(5 citation statements)

References 13 publications

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“…The study on turbulence has made many achievements [ Lauren et al , 2001; Nakamura and Mahrt , 2005; Peinke et al , 2004; Sun et al , 2004; Xu et al , 1997]. And now the investigations on gusts have attracted more and more attentions of scientists [ Barth et al , 2005; Proppe and Wetzel , 2006; Wang and Karrem , 2006; Zheng and Zhang , 2010].…”

Section: Introductionmentioning

confidence: 99%

Parameterizations of some important characteristics of turbulent fluctuations and gusty wind disturbances in the atmospheric boundary layer

Cheng¹,

Wu²,

Hu³

et al. 2012

J. Geophys. Res.

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[1] Parameterizations of several key characteristics of the high frequency turbulent fluctuations, the intermediate gusty wind disturbances, and their vertical profiles have been constructed with the physically based approach, and by the use of multilevel ultrasonic anemometer -thermometer observational data sets in the cold air mass. These characteristics are the kinetic energy and friction velocity of the turbulence and gust, the equivalent horizontal and vertical amplitudes and equivalent period of the gust train. The accuracy of parameterizations is statistically good (the coefficient of determination R 2 > 0.5). Some problems about their further improvement and application were also discussed in this paper. Parameterization of gusty wind disturbances separated from the high frequency turbulence is important in the models for calculation and prediction of emission and entrainment of aerosol particles in the atmospheric boundary layer, because the role of turbulence is diffusion, but gusty wind disturbances act as small scale advection to entrain particles into the upper part of the atmospheric boundary layer.

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Section: Introductionmentioning

confidence: 99%

Parameterizations of some important characteristics of turbulent fluctuations and gusty wind disturbances in the atmospheric boundary layer

Cheng¹,

Wu²,

Hu³

et al. 2012

J. Geophys. Res.

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“…Publications on the gusty wind disturbances (or gustiness) were not as many as on the turbulence. Some of them were devoted to the correction of vertical fluxes at the surface by taking the wind gustiness into account [ Zeng et al , 2002; Morcrette et al , 2008], some others to the numerical simulation of wind gusts (the maximum wind speed in a time interval) and their prediction [ Brasseur , 2001; Ágústsson and Olafsson , 2006; Peinke et al , 2004; Barth et al , 2005; Wang and Karrem , 2006; Proppe and Wetzel , 2006; Ágústsson and Olafsson , 2009; Li et al , 2006; Goyette et al , 2003; Zhu , 2008] and to the case study of observations [ Li et al , 2004; Xu et al , 1997; Lauren et al , 2001; Sun et al , 2004; Nakamura and Mahrt , 2005]. Our monitoring network provides us good observational data sets for rather systematically analyzing the dynamical structures of gusty wind disturbances.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of gusty wind disturbances and turbulent fluctuations in windy atmospheric boundary layer behind cold fronts

Cheng

Qingcun

2011

J. Geophys. Res.

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[1] Statistical analysis of turbulent and gusty characteristics in the atmospheric boundary layer with strong mean wind behind cold fronts has been carried out. The data used in the analysis were the multilevel ultrasonic anemometer-thermometer observations for 5 years during spring in East Asia. The results show: (1) there is systematical descending component of the basic flow in the lower part and ascending component in the upper part of the boundary layer; (2) the turbulent fluctuations (period less than 1 min) are nearly random and isotropic with weak coherency, but the gusty wind disturbances (1 min < period < 10 min) are anisotropic with rather strong coherency; (3) the kinetic energy of gusty wind disturbances and the related downward flux of momentum reach their maximum at some level below h*, where h* is the level separating the descending and ascending components of the mean flow; and (4) the turbulent kinetic energy and related downward flux of momentum increase first in the lowest layer and then decrease with height, if the fastest sampling frequency is 10 Hz, although the reason is unclear yet.Citation: Cheng, X., Q.-C. Zeng, and F. Hu (2011), Characteristics of gusty wind disturbances and turbulent fluctuations in windy atmospheric boundary layer behind cold fronts,

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“…a distributed anemometer) would certainly help in managing the maintenance and risks of failure more efficiently. A particularly interesting example of this is the high-speed railway, where lateral wind may cause disruption in the catenary-pantograph interaction (for moderately high wind loads), and even wagon derailment and overturn in more severe cases [4,5]. To enhance the safety and reliability of many railway lines, it would be convenient to have the capability of monitoring the magnitude of lateral wind over relatively long sections of e.g.…”

Section: Introductionmentioning

confidence: 99%

Long-range distributed optical fiber hot-wire anemometer based on chirped-pulse ΦOTDR

et al. 2018

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Abstract:We demonstrate a technique allowing to develop a fully distributed optical fiber hot-wire anemometer capable of reaching a wind speed uncertainty of ≈ ±0.15 m/s (±0.54 km/h) at only 60 mW/m of dissipated power in the sensing fiber, and within only four minutes of measurement time. This corresponds to similar uncertainty values than previous papers on distributed optical fiber anemometry but requires two orders of magnitude smaller dissipated power and covers at least one order of magnitude longer distance. This breakthrough is possible thanks to the extreme temperature sensitivity and single-shot performance of chirped-pulse phase-sensitive optical time domain reflectometry (ΦOTDR), together with the availability of metal-coated fibers. To achieve these results, a modulated current is fed through the metal coating of the fiber, causing a modulated temperature variation of the fiber core due to Joule effect. The amplitude of this temperature modulation is strongly dependent on the wind speed at which the fiber is subject. Continuous monitoring of the temperature modulation along the fiber allows to determine the wind speed with singular low power injection requirements. Moreover, this procedure makes the system immune to temperature drifts of the fiber, potentially allowing for a simple field deployment. Being a much less power-hungry scheme, this method also allows for monitoring over much longer distances, in the orders of 10s of km. We expect that this system can have application in dynamic line rating and lateral wind monitoring in railway catenary wires.

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Overturning Probability of Railway Vehicles under Wind Gust Loads

Cited by 8 publications

References 13 publications

Parameterizations of some important characteristics of turbulent fluctuations and gusty wind disturbances in the atmospheric boundary layer

Parameterizations of some important characteristics of turbulent fluctuations and gusty wind disturbances in the atmospheric boundary layer

Characteristics of gusty wind disturbances and turbulent fluctuations in windy atmospheric boundary layer behind cold fronts

Long-range distributed optical fiber hot-wire anemometer based on chirped-pulse ΦOTDR

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