Correlation between tyre/road noise levels measured by the Coast-By and the Close-ProXimity methods

Cesbron, Julien; Klein, Philippe

doi:10.1016/j.apacoust.2017.05.005

Cited by 17 publications

(8 citation statements)

References 7 publications

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“…Anfosso-Lédée conclusions on the relation between CPX and sound power was corroborated on a later study by Campillo-Davo et al [5]. Other studies also have addressed the relationship between CPX noise and roadside measurements [8,35].…”

Section: Background and Related Studiesmentioning

confidence: 68%

CPX based synthesis for binaural auralization of vehicle rolling noise to an arbitrary positioned stander-by receiver

et al. 2021

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Virtual reality is becoming an important tool for studying the interaction between pedestrians and road vehicles, by allowing the analysis of potentially hazard situations without placing subjects in real risk. However, most of the current simulators are unable to accurately recreate traffic sounds that are congruent with the visual scene. This has been recognized as a fault in the virtual audio-visual scenarios used in such contexts. This study proposes a method for delivering a binaural auralization of the noise generated by a moving vehicle to an arbitrarily located moving listener (pedestrian). Building on previously developed methods, the proposal presented here integrates in a novel way a dynamic auralization engine, thus enabling real-time update of the acoustic cues in the binaural signal delivered via headphones. Furthermore, the proposed auralization routine uses Close ProXimity (CPX) tyre-road noise signal as sound source input, facilitating the quick interchangeability of source signals, and easing the noise collection procedure. Two validation experiments were carried out, one to quantitatively compare field signals with CPX-derived virtual signal recordings, and another to assess these same signals through psychoacoustic models. The latter aims to assure that the reproduction of the synthesized signal is perceptually similar to one occurring on pedestrian/vehicle interactions during situations of street crossing. Discrepancies were detected, and emphasized when the vehicle is within close distance from the receiver (pedestrian). However, the analysis indicated that these pose no hindrance to the study of vehicle-pedestrian interaction. Improvements to the method are identified and further developments are proposed.

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Section: Background and Related Studiesmentioning

confidence: 68%

CPX based synthesis for binaural auralization of vehicle rolling noise to an arbitrary positioned stander-by receiver

et al. 2021

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“…The independent term of Equation (1), 22.5, could slightly vary depending on the pavement characteristics [11,12]. A similar relationship between coast by and CPX methods was recently establish by Cesbron and Klein at vehicle speeds ranging between 50 and 110 km/h [13].…”

Section: Environmental Noise Levels From Close Proximity (Cpx) Noise mentioning

confidence: 87%

Surface Aging Effect on Tire/Pavement Noise Medium-Term Evolution in a Medium-Size City

et al. 2018

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This paper presents the geo-referenced acoustical results obtained throughout the close proximity noise (CPX) technique carried out on different urban sections included within the 2017 strategic noise mapping (Directive 2002/49/CE) in Ciudad Real, a Spanish medium-sized city. The employed methodology quantifies the tire/pavement noise generated in the contact between the tire and the surface of the studied sections. Measurements were carried out in different research campaigns between 2008 and 2015 (medium-term evolution). They give valuable information about the pavement-aging effect on its surface characteristics. Throughout these years, the acoustic situation of these sections has worsened mainly due to surface damage and higher mean profile depth (MPD) values, although the performance does not follow the same pattern in every section. The relationships between measured tire/pavement noise and theoretical environmental noise, just due to the geometric spreading of sound energy, is also studied in order to elaborate a simple rolling noise mapping and to assess the environmental noise evolution. Traffic noise plays the main role in the noise registered within the assessed sections, therefore, CPX assessment could be used by local authorities to take decisions regarding urban planning and traffic management, with the aim of reducing noise exposure from traffic.

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“…First, the L Amax,CPX values are converted into values corresponding to the statistical pass-by method (L Amax,SPB ). For this purpose, the CPX/SPB filter, proposed by [33], was used. In practice, it corresponds to a reduction (∆L r ) of 21.6 ± 0.9 dB.…”

Section: Calculation Of the Sound Power Level Per Unit Length From Thmentioning

confidence: 99%

The Influence of Pavement Degradation on Population Exposure to Road Traffic Noise

2019

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Road pavement develops distresses over time, which increase tyre/road noise. This work focuses on the impact of these distresses on environmental noise. To calculate the environmental noise, a method to transform Close ProXimity (CPX) measurement results into the required input for traffic noise models was defined and used. The tyre/road noise levels were determined by the CPX method for three types of pavement, with three types of distress, at three different speed levels. The study was carried out in the city center of Guimarães, a medium-sized Portuguese city. Using the NMPB model, 18 noise maps were produced for the passing of one single vehicle, taking into account two levels of distress (50% and 100%) for the pavement. The presence of distresses increased the noise, calculated at control points, by up to 7.1 dBA, and the percentage of the population exposed to levels over 45 dB was more than 11%. It was shown that pavement maintenance at early stages of distress development is, particularly for low-speed roads, very important to reduce environmental noise and population exposure. A comprehensive selection of the type of surface and speed control policies can mitigate the impact of a lack of maintenance.

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Correlation between tyre/road noise levels measured by the Coast-By and the Close-ProXimity methods

Cited by 17 publications

References 7 publications

CPX based synthesis for binaural auralization of vehicle rolling noise to an arbitrary positioned stander-by receiver

CPX based synthesis for binaural auralization of vehicle rolling noise to an arbitrary positioned stander-by receiver

Surface Aging Effect on Tire/Pavement Noise Medium-Term Evolution in a Medium-Size City

The Influence of Pavement Degradation on Population Exposure to Road Traffic Noise

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