On the use of second-order derivatives of track irregularity for assessing vertical track geometry quality

Li, Martin; Persson, Ingemar; Spannar, J.; Berg, Mats

doi:10.1080/00423114.2012.671947

Cited by 30 publications

(19 citation statements)

References 3 publications

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“…It is also shown that the acceleration of the wheelset is dependent on the second-order derivative of the longitudinal level of the track rather than on the amplitude. Some results, presented in [89], look very promising. The results have been produced with simulations in GENSYS.…”

Section: 312mentioning

confidence: 79%

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Road and track irregularities: measurement, assessment and simulation

Haigermoser

Luber²,

Rauh

et al. 2015

Vehicle System Dynamics

108

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Road and track irregularities have an important influence on the dynamic behaviour of vehicles.Knowledge of their characteristics and magnitude is essential for the design of the vehicle but also for comparable homologation and acceptance tests as well as for the planning and management of track maintenance. Irregularities of tracks and roads are regularly measured using various measurement technologies. All have advantages and weaknesses and require several processing steps. Characterisation of irregularities is done in the distance as well as in the wavelength domain. For rail irregularities, various distance domain description methods have been proposed and are in use. Methods have been analysed and compared with regard to their processing steps. Several methods have been analysed using measured irregularity and vehicle response data. Characterisation in the wavelength domain is done in a similar way for track and road irregularities. Here, an important issue is the estimation of the power spectral densities and the approximation by analytical formulas. For rail irregularities, periodic defects also play an important role. The use of irregularities in simulations requires various processing steps if measured irregularities are used, as well as if synthetic data are utilised. This paper gives a quite complete overview of rail irregularities and points out similarities and differences to the road.

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Section: 312mentioning

confidence: 79%

“…In [89], a method is presented describing how the second-order derivatives of the track irregularities, instead of the amplitudes themselves, should be used when evaluating the track/vehicle interaction. This is motivated by an analysis of the equations of motion of a simple model such as that sketched at the top of Figure 14.…”

Section: 312mentioning

confidence: 99%

Road and track irregularities: measurement, assessment and simulation

Haigermoser

Luber²,

Rauh

et al. 2015

Vehicle System Dynamics

108

View full text Add to dashboard Cite

show abstract

“…The vehicle reactions at the same level of track geometry can differ significantly, as shown by many authors, e.g. [3][4][5] and as visible in Figure 1. On the left-hand side of Figure 1, the 'maximum values' in track sections (actually the 99.85% or 0.15% percentiles) of the sum of the guiding forces Y max of the first wheelset is plotted against the standard deviations of alignment in the wavelength range D1 (according to EN 13848-1).…”

Section: Problem Outline and Motivationmentioning

confidence: 94%

“…In Refs [5,15,16], methods are proposed, where second-order derivatives of the track irregularities, instead of the amplitudes themselves, should be used when evaluating the track-vehicle interaction.…”

Section: Problem Outline and Motivationmentioning

confidence: 99%