Characterization of tire-road noise from Brazilian roads using the CPX trailer method

Knabben, Ramon Mendes; Trichês, Glicério; Vergara, Erasmo F.; Gerges, Samir N. Y.; Keulen, Wim van

doi:10.1016/j.apacoust.2019.03.013

Cited by 18 publications

(3 citation statements)

References 38 publications

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“…This method uses multiple runs of a test vehicle equipped with standard tyres measured by microphones placed close by. CPX can evaluate the pavement noise emission along its full length, and is able to identify pavement damage [43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Adjusted Controlled Pass-By (CPB) Method for Urban Road Traffic Noise Assessment

Moreno

Bianco²,

Carpita³

et al. 2023

Sustainability

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Noise associated with road infrastructure is a prominent problem in environmental acoustics, and its implications with respect to human health are well documented. Objective and repeatable methodologies are necessary for testing the efficacy of sustainable noise mitigation methods such as low noise emission pavement. The Controlled Pass-By (CPB) method is used to measure the sound generated by passing vehicles. Despite its popularity, the applicability of CPB is compromised in urban contexts, as its results depend on test site conditions, and slight changes in the experimental setup can compromise repeatability. Moreover, physical conditions, reduced space, and urban elements risk confine its use to only experimental road sites. In addition, vehicle speed represents a relevant factor that further contributes to the method’s inherent instability. The present paper aims to extend the applicable range of this method and to provide more reliable results by proposing an adjusted CPB method. Furthermore, CPB metrics such as LAmax do not consider the travelling speed of the vehicle under investigation. Our proposed method can yield an alternative metric that takes into account the duration of the noise event. A hypothetical urban case is investigated, and a signal processing pipeline is developed to properly characterize the resulting data. Speed cushions, manhole covers, and other spurious effects not related to the pass-by sound emissions of ordinary vehicles are pinpointed as well.

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Section: Introductionmentioning

confidence: 99%

Adjusted Controlled Pass-By (CPB) Method for Urban Road Traffic Noise Assessment

Moreno

Bianco²,

Carpita³

et al. 2023

Sustainability

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show abstract

“…Then, the stabilization of this device and the measurement system itself were evaluated and compared with the traditional one. Knabben et al [32,33] prepared four different types of asphalt mixtures. The sound absorption characteristics of the materials were analyzed using the standing wave tube sound absorption coefficient method; the CPX trailer method was used to characterize the tire pavement noise of Brazilian roads, and different road types were examined.…”

Section: Introductionmentioning

confidence: 99%

Relationship between the Void and Sound Absorption Characteristics of Epoxy Porous Asphalt Mixture Based on CT

Gao

et al. 2022

Coatings

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This study investigates the relationship between the void characteristics and sound absorption characteristics of an epoxy porous asphalt mixture. The specimens are scanned and reconstructed under different void fractions using X-ray computed tomography (CT) technology and digital image processing, and the sound absorption coefficients at different frequencies are obtained using an acoustic impedance tube. The relationship between void characteristics and sound absorption characteristics is analyzed using gray correlation. The test results exhibited a good correlation between the void characteristics of the epoxy porous asphalt mixture obtained by CT scanning (mesoscale) and the measured values (macroscale). The difference between the void fraction and connected void fraction gradually decreased with an increase in the void fraction. The relationship curve between the sound absorption coefficient and frequency exhibited a bimodal trend, and the peak value of the sound absorption coefficient increased with an increase in the void fraction. The order of the gray correlation degree between the peak and average values of the sound absorption coefficient and the void characteristic parameters is as follows: connected void fraction > void fraction > equivalent diameter of connected void > surface area of connected void > curvature.

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“…The reference tyre is usually placed onto the wheels of a special trailer pulled by the vehicle in the driving path, i.e., the trailer has a total of two tyres placed in the distance corresponding to that between the tyres of a regular vehicle. If the reference tyre is placed in a special housing serving as an anechoic chamber, the method is described as enclosed CPX [32,[41][42][43][44][45]. In some cases, measurement is done using only one reference tyre placed in the centre of the trailer [46,47].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Exposed Aggregate Cement Concrete Surface and Stone Mastic Asphalt Surface Noise Emissions by Close-Proximity Method

Hablovicova¹,

Křivánek²,

Marková³

2021

Applied Sciences

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In this study, results from long-term monitoring of the tyre/road noises of the exposed aggregate cement concrete (EACC) with the highest grain size of 8 mm and stone mastic asphalt (SMA) surface with the highest grain size of 11 mm performed by close-proximity (CPX) method are presented. There are certain concerns that the EACC surface will have inferior noise properties than SMA. These concerns are based on previous experience with the cement concrete surface with transverse tining texture which is very noisy. The main aim of this article is to demonstrate that these concerns are unfounded. A section of the motorway was chosen for the measuring and the testing speed for all measurements was 80 km·h−1. Provisional results (based on six years of monitoring) show that the noise levels measured on both these surface types are similar over their lifetime and exhibit logarithmic acoustic behaviour.

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Characterization of tire-road noise from Brazilian roads using the CPX trailer method

Cited by 18 publications

References 38 publications

Adjusted Controlled Pass-By (CPB) Method for Urban Road Traffic Noise Assessment

Adjusted Controlled Pass-By (CPB) Method for Urban Road Traffic Noise Assessment

Relationship between the Void and Sound Absorption Characteristics of Epoxy Porous Asphalt Mixture Based on CT

Comparison of Exposed Aggregate Cement Concrete Surface and Stone Mastic Asphalt Surface Noise Emissions by Close-Proximity Method

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