Prediction of noise from trams

Mandula, Ján; Salaiová, Brigita; Kovaľaková, Mária

doi:10.1016/s0003-682x(01)00047-0

Cited by 17 publications

(12 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Even if quite efficient models [15,21] and solutions exist for its mitigation [14,16] (e.g. iron rings [2,3], active control [8], high positive friction [5]) the experimental validation of squeal models remains a challenging task for two reasons [17]: (i) for identical operating conditions, there exist large fluctuations in the sound levels radiated, in the mode which squeals and even in the occurrence of squeal; (ii) squeal has been recorded without any associated negative slope of the creepage-creep force law [13].…”

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

View full text Add to dashboard Cite

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.

show abstract

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

View full text Add to dashboard Cite

show abstract

“…The recorded noise levels at a train density of eight per hour were greater than those at three trains per hour [13,31]. A study conducted at Technical University of Kosice, Slovakia, concluded that the equivalent noise level is directly correlated to the train density [33]. The significance of variations in the L Aeq at different train and tram densities indicated that the observed variations were real and not accidental.…”

Section: Discussionmentioning

confidence: 90%

Assessment of ambient noise levels in the urban residential streets of Eastern Alexandria, Egypt

Zaki

2012

Journal of the Egyptian Public Health Association

View full text Add to dashboard Cite

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

Prediction of noise from trams

Cited by 17 publications

References 1 publication

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

Assessment of ambient noise levels in the urban residential streets of Eastern Alexandria, Egypt

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

Contact Info

Product

Resources

About