Uncertainty in the standardized method "Characterization of the acoustic properties of road surfaces" by CEN TC227 WG5

2021 ◽  
Vol 263 (6) ◽  
pp. 314-322
Author(s):  
Gijsjan van Blokland ◽  
Luc Goubert
Keyword(s):  
Calculation Model ◽  
Acoustic Properties ◽  
Noise Emission ◽  
Road Vehicles ◽  
The Road ◽  
Road Pavement ◽  
Road Surfaces ◽  
Standardized Method ◽  
Limited Accuracy

TC227 of CEN has developed a method to determine the effect of the road pavement on the sound emission of road vehicles. The proposed methods can be applied to define the acoustic label value of a generic or proprietary pavement type, to check compliance of a pavement with the specifications for that pavement type and to monitor the development of the acoustic properties over the lifetime of the product. With the procedure one can additionally derive the coefficients for the pavement correc tion in the noise emission formulae for road vehicles in the CNOSSOS-EU calculation model. The application of the method exhibits a limited accuracy. The paper investigates the sources of uncertainty of the standardized method and combine the contributions into a single overall uncertainty according to the procedures laid down in Guide 98-3 of ISO. The uncertainty is determined for each of the listed application areas. From the uncertainty analysis the major contributions are identified. Improvement of the method shall focus on only these contributions.

scholarly journals Investigation of Acoustic Properties of Different Types of Low-Noise Road Surfacers under In Situ and Laboratory Conditions

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 480
Author(s):  
Janusz Bohatkiewicz ◽  
Maciej Hałucha ◽  
Marcin Kamil Dębiński ◽  
Michał Jukowski ◽  
Zbigniew Tabor
Keyword(s):  
Sound Absorption ◽  
Low Noise ◽  
Operating Conditions ◽  
Acoustic Properties ◽  
Road Noise ◽  
In Situ Conditions ◽  
Study Results ◽  
Road Surfaces ◽  
Impedance Tube Method

Current literature on the performance characteristics of road surfaces is primarily focused on evenness, roughness and technical durability. However, other important surface properties require analysis, including noisiness, which is an important feature of the environmental impact of vehicular traffic around roads. This can be studied using various methods by which road noise phenomena are investigated. The method used to measure the noise performance of road surfaces herein is the Statistical Pass-By (SPB) method, as described in ISO 11819-1:1997. The impedance tube method was used for sound absorption testing, as described in ISO 13472-2:2010. These tests were performed under a variety of conditions: in situ and in laboratory. The existence of relationships between them can be helpful in selecting surfaces for noise reduction. Preliminary surface noise tests can be performed in the laboratory with samples consisting of various compounds. This is less expensive and faster than doing so on purpose-built surfaces. The paper presents study results for sound absorption coefficients of various types of low-noise surfaces in in situ conditions (on an experimental section and on operated road sections) and in the laboratory setting. The results of the tests performed on the operational sections were compared to the results of the surface impact on road noise using the SPB method. The correlations between the test results help confirm the feasibility of road surface pre-testing in the laboratory and the relation to tests performed using the SPB method under typical operating conditions.

Acoustic Properties of Artifical Larnyx Speech

1988 ◽  
Vol 16 ◽  
pp. 31-39
Author(s):  
Bethann Moffet ◽  
Rebekah Pindzola
Keyword(s):  
Acoustic Properties

Acoustic properties of rare-earth alloys Tb0.27Dy0.73(Fe1-xMnx)1.9

1994 ◽  
Vol 04 (C5) ◽  
pp. C5-705-C5-708
Author(s):  
V. PREOBRAZHENSKY ◽  
I. DUBENKO ◽  
N. ECONOMOV ◽  
A. ZAIKIN
Keyword(s):  
Rare Earth ◽  
Acoustic Properties ◽  
Rare Earth Alloys

Studies of Acoustic Properties of Substituted Heterocyclic Drugs in Dioxane & Dioxane-Water Mixture At 290C

2011 ◽  
Vol 4 (7) ◽  
pp. 75-78
Author(s):  
Y. K. Meshram Y. K. Meshram ◽  
◽  
K.N.Sonune K.N.Sonune ◽  
Rohinee R Dharamkar
Keyword(s):  
Acoustic Properties ◽  
Water Mixture

Study of Elastic and Acoustic Properties of TiN

2014 ◽  
Vol 2014 (1) ◽  
pp. 24-28 ◽  
Author(s):  
Sanjay Srivastava ◽  
◽  
Nitu Yana ◽  
A.K. Gupta ◽  
Y. Srivastava ◽  
...  
Keyword(s):  
Acoustic Properties

Tire-Road Interactions — Harmony or Conflict?

1989 ◽  
Vol 17 (1) ◽  
pp. 66-84
Author(s):  
A. R. Williams
Keyword(s):  
Rolling Resistance ◽  
Major Effect ◽  
Road Surface ◽  
Interactive Effects ◽  
Central Theme ◽  
Water Drainage ◽  
The Road ◽  
Truck Tires ◽  
Road Surfaces ◽  
Tire Wear

Abstract This is a summary of work by the author and his colleagues, as well as by others reported in the literature, that demonstrate a need for considering a vehicle, its tires, and the road surface as a system. The central theme is interaction at the footprint, especially that of truck tires. Individual and interactive effects of road and tires are considered under the major topics of road aggregate (macroscopic and microscopic properties), development of a novel road surface, safety, noise, rolling resistance, riding comfort, water drainage by both road and tire, development of tire tread compounds and a proving ground, and influence of tire wear on wet traction. A general conclusion is that road surfaces have both the major effect and the greater potential for improvement.

Tire Vibration Modes and Effects on Vehicle Ride Quality

1993 ◽  
Vol 21 (1) ◽  
pp. 23-39 ◽  
Author(s):  
R. W. Scavuzzo ◽  
T. R. Richards ◽  
L. T. Charek
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Operating Conditions ◽  
Modal Testing ◽  
Ride Quality ◽  
Vibration Modes ◽  
Inflation Pressure ◽  
Passenger Cars ◽  
Element Modeling ◽  
Road Surfaces

Abstract Tire vibration modes are known to play a key role in vehicle ride, for applications ranging from passenger cars to earthmover equipment. Inputs to the tire such as discrete impacts (harshness), rough road surfaces, tire nonuniformities, and tread patterns can potentially excite tire vibration modes. Many parameters affect the frequency of tire vibration modes: tire size, tire construction, inflation pressure, and operating conditions such as speed, load, and temperature. This paper discusses the influence of these parameters on tire vibration modes and describes how these tire modes influence vehicle ride quality. Results from both finite element modeling and modal testing are discussed.

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