Curve squeal of urban rolling stock—Part 1: State of the art and field measurements

Vincent, Nicolas; Koch, Jann; Chollet, Hugues; Guerder, Jean-Yves

doi:10.1016/j.jsv.2005.12.008

Cited by 53 publications

(51 citation statements)

References 8 publications

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“…A more complete mathematical description of the wheel lateral dynamics has been included in [19], and later in [6,7]. An experimental validation on a scaled test bench has been presented in [4,22]. The vertical dynamics has been lately introduced in a squeal model by [1], but its role in the mechanism of squeal noise has not been investigated.…”

Section: Introductionmentioning

confidence: 99%

Importance of the Wheel Vertical Dynamics in the Squeal Noise Mechanism on a Scaled Test Bench

Collette¹

2012

Shock and Vibration

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Abstract. This paper investigates the influence of the wheel vertical dynamics in the mechanism of squeal noise on a scaled test bench. To this purpose, sustained oscillations are first studied on a single degree of freedom oscillator, considering both a decreasing slope of the friction curve and a vertical excitation. Their relative importance to sustain the oscillations is discussed. Then, a mathematical model of a quarter scale test bench is developed in the frequency domain. Using this model, it is shown that the squeal noise resulting from the excitation of the bending modes of the wheel is sustained because these bending modes are associated with variations of the vertical contact force. Results are further confirmed by experiments conducted on a scaled test bench.

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Section: Introductionmentioning

confidence: 99%

Importance of the Wheel Vertical Dynamics in the Squeal Noise Mechanism on a Scaled Test Bench

Collette¹

2012

Shock and Vibration

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“…The feasibility of this method has been investigated with FEM. The FEA model in Figure 1(b) shows the configuration of the testrig, where S 1 , S 2 , S 3 and S 4 show the position of the strain gauges, and the Q and W are the lateral force and the normal force in rolling contact. A method was developed for the testrig to measure the angle of attack using a laser distance measurer, which emits a laser beam perpendicular to the wheel, projecting a point on a white board about 6 meters away from the wheel.…”

Section: Experimental Methodsmentioning

confidence: 99%

The modeling of wheel squeal in the time domain and its validation

Liu

Meehan

2013

Proceedings of Meetings on Acoustics

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The sound pressure level of wheel squeal has been shown to increase with the angle of attack and rolling speed in both field and laboratory tests, but the causes behind the manner of increase are still unknown. To investigate this, a model in the time domain was extended by utilising nonlinear rolling contact theory developed specially for wheel squeal. This model is used to simulate the vibration velocity of a testrig wheel at different rolling speed and angle of attack. The results correlate well with the recorded sound pressure level of wheel squeal in laboratory tests. It was found that due to the interaction of wheel vibration with lateral force and lateral creepage the vibration velocity amplitude of the wheel increases with angle of attack and rolling speed increases. This explains why the sound pressure level of wheel squeal also increases in the same manner. The phenomenon is explained theoretically using the mechanics based model.

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“…There are a decent number of (older) studies related to tram sound emissions [5,6], determining factors [6,7] and about special issues such as squeal noise [8][9][10]. However, the current scientific data base regarding tramway immissions is small, most (except [11][12][13]) reported sound levels only in dBA, neglecting potential low frequency components and other specific characteristics of tramway sounds, which are produced by the various noise sources of this complex vehicle [7].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Psychoacoustic and Vibration-Related Parameters to Track the Reasons for Health Complaints after the Introduction of New Tramways

Cik

Lienhart

2016

Applied Sciences

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Abstract:Background: A change to new tramways in Graz (Austria) led to severe complaints in residential areas. To understand the underlying reasons for these complaints, a systematic measurement campaign was designed. Methods: Six locations in Graz and two locations in a comparably sized city were selected. Parallel indoor recordings of sound and vibrations were conducted from 8:00 p.m. to 8:00 a.m. (due to sleep problems) at all locations. Results: Vibration levels remained below the limits of the Austrian standard (Wm-weighting) although variability was observed among sites, tram types and pass-bys. A complex characteristic of the acoustic feature space was found with A-weighting (differences between A-and C-weighting of more than 15 dB were observed). C-weighted background to peak noise ratios clearly distinguished "old" from "new" trams. Psychoacoustic indices indicated a high variability between locations and tram types. Roughness and loudness was higher in "new" versus "old" trams at most locations. "New" trams exhibited high sharpness values and variability, especially at higher speeds-when compared with trams from a control city. Conclusions: Standard indicators of sound and vibration were not sensitive enough to uncover the reasons for the complaints. Only the integrated analysis of the ambient soundscape (high signal-to-noise-ratio), the more noticeable sound (in psychoacoustic terms) and the observed high variance of the immissions provided guidance to implement appropriate technical solutions.

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Curve squeal of urban rolling stock—Part 1: State of the art and field measurements

Cited by 53 publications

References 8 publications

Importance of the Wheel Vertical Dynamics in the Squeal Noise Mechanism on a Scaled Test Bench

Importance of the Wheel Vertical Dynamics in the Squeal Noise Mechanism on a Scaled Test Bench

The modeling of wheel squeal in the time domain and its validation

Analysis of Psychoacoustic and Vibration-Related Parameters to Track the Reasons for Health Complaints after the Introduction of New Tramways

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