Locomotive Friction-Creep Studies

Logston, C F; Itami, G S

doi:10.1115/1.3183865

Cited by 36 publications

(20 citation statements)

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“…Polach [64] studied adhesion limits and reported five sets of measurements from locomotives under traction which showed falling friction above a creepage of 0.3%. These measurements included those of Lang and Roth [63] reported by Ertz [62] and of Logston and Itami [61]. The negative slope was steeper at higher speeds.…”

Section: Logston and Itami [61] Present Falling Friction Curves From mentioning

confidence: 98%

A State-of-the-Art Review of Curve Squeal Noise: Phenomena, Mechanisms, Modelling and Mitigation

Thompson

Squicciarini

Ding

et al. 2018

Notes on Numerical Fluid Mechanics and Multidisciplinary Design

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Curve squeal is an intense tonal noise occurring when a rail vehicle negotiates a sharp curve. The phenomenon can be considered to be chaotic, with a widely differing likelihood of occurrence on different days or even times of day. The term curve squeal may include several different phenomena with a wide range of dominant frequencies and potentially different excitation mechanisms. This review addresses the different squeal phenomena and the approaches used to model squeal noise; both time-domain and frequency-domain approaches are discussed and compared. Supporting measurements using test rigs and field tests are also summarised. A particular aspect that is addressed is the excitation mechanism. Two mechanisms have mainly been considered in previous publications. In many early papers the squeal was supposed to be generated by the so-called falling friction characteristic in which the friction coefficient reduces with increasing sliding velocity. More recently the mode coupling mechanism has been raised as an alternative. These two mechanisms are explained and compared and the evidence for each is discussed. Finally, a short review is given of mitigation measures and some suggestions are offered for why these are not always successful.

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Section: Logston and Itami [61] Present Falling Friction Curves From mentioning

confidence: 98%

A State-of-the-Art Review of Curve Squeal Noise: Phenomena, Mechanisms, Modelling and Mitigation

Thompson

Squicciarini

Ding

et al. 2018

Notes on Numerical Fluid Mechanics and Multidisciplinary Design

View full text Add to dashboard Cite

show abstract

“…6). • Measurements on GM locomotives SD 45X in the USA [24], wet and dry contact conditions, average values and 90% data bands of measurements with speeds between 16 and 32 km/h (Fig. 7).…”

Section: Parameter Identification From Measurementsmentioning

confidence: 99%

Creep forces in simulations of traction vehicles running on adhesion limit

Polách¹

2005

Wear

394

294

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“…Chen et al [3,4] theoretically studied the influences of the surface roughness and the water temperature on the adhesion (i.e., traction) characteristics under high-speed conditions by means of the partial elastohydrodynamic lubrication (EHL) theory with the contact theory of rough surfaces; they also experimentally studied these influences by using a twin-disc rolling-contact machine. Logston and Itami investigated the characteristics of friction creep under dry, wet, and oily conditions by using a locomotive [5]. Jin et al [6] carried out experimental and theoretical investigations of the adhesion coefficient under dry, wet, and oil-contamination conditions at high speeds using a full-scale test facility.…”

Section: Introductionmentioning

confidence: 99%