Wheel Squeal: Insights from Wayside Condition Monitoring

Jiang, Jiandong; Hanson, David G.; Dowdell, Bruce

doi:10.1007/978-3-319-73411-8_2

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…Previous studies have shown that squeal occurrences are dependent on angle of attack (see e.g. [15,31]). In this modelling approach, however, if constant friction is considered and the angle of attack is large enough for the creep-adhesion curve to be in the saturated region, the actual value of the angle of attack is no longer important for stability.…”

Section: Description Of the Wheel/rail Interaction Modelmentioning

confidence: 99%

An assessment of mode-coupling and falling-friction mechanisms in railway curve squeal through a simplified approach

Ding

Squicciarini

Thompson

et al. 2018

Journal of Sound and Vibration

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Curve squeal is one of the most annoying types of noise caused by the railway system. It usually occurs when a train or tram is running around tight curves. Although this phenomenon has been studied for many years, the generation mechanism is still the subject of controversy and not fully understood. A negative slope in the friction curve under full sliding has been considered to be the main cause of curve squeal for a long time but more recently mode coupling has been demonstrated to be another possible explanation. Mode coupling relies on the inclusion of both the lateral and vertical dynamics at the contact and an exchange of energy occurs between the normal and the axial directions. The purpose of this paper is to assess the role of the mode-coupling and falling-friction mechanisms in curve squeal through the use of a simple approach based on practical parameter values representative of an actual situation. A tramway wheel is adopted to study the effect of the adhesion coefficient, the lateral contact position, the contact angle and the damping ratio. Cases corresponding to both inner and outer wheels in the curve are considered and it is shown that there are situations in which both wheels can squeal due to mode coupling. Additionally, a negative slope is introduced in the friction curve while keeping active the vertical dynamics in order to analyse both mechanisms together. It is shown that, in the presence of mode coupling, the squealing frequency can differ from the natural frequency of either of the coupled wheel modes. Moreover, a phase difference between wheel vibration in the vertical and lateral directions is observed as a characteristic of mode coupling. For both these features a qualitative comparison is shown with field measurements which show the same behaviour.

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Section: Description Of the Wheel/rail Interaction Modelmentioning

confidence: 99%

An assessment of mode-coupling and falling-friction mechanisms in railway curve squeal through a simplified approach

Ding

Squicciarini

Thompson

et al. 2018

Journal of Sound and Vibration

View full text Add to dashboard Cite

show abstract

“…Extensive field trials have been conducted in Australia on both suburban and freight trains, including monitoring the effect of friction modifiers [1,2,81,82,83]; the angle of attack of each passing wheelset has also been monitored. Two main categories of squeal were identified by Anderson et al [1,81].…”

Section: Freight Trainsmentioning

confidence: 99%

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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Wheel Squeal: Insights from Wayside Condition Monitoring

Cited by 2 publications

References 5 publications

An assessment of mode-coupling and falling-friction mechanisms in railway curve squeal through a simplified approach

An assessment of mode-coupling and falling-friction mechanisms in railway curve squeal through a simplified approach

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

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