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BS ISO 13325:2019

BS ISO 13325:2019

$102.76

Tyres. Coast-by methods for measurement of tyre-to-road sound emission

Published By Publication Date Number of Pages
BSI 2019 20
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This document specifies methods for measuring tyre-to-road sound emissions from tyres fitted on a motor vehicle under coast-by conditions, i.e. when the vehicle is in free-rolling, non-powered operation. This is typically achieved by putting the transmission in the neutral or equivalent position and switching off the engine as well as all auxiliary systems not necessary for safe driving.

This document is applicable to passenger cars and commercial vehicles as defined in ISO 3833. It is not intended to be used to determine the sound contribution of tyres of vehicles running in powered condition nor for the determination of traffic sound nuisance at a given location.

PDF Catalog

PDF Pages PDF Title
2 National foreword
6 Foreword
7 1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
4.1 LI
8 4.2 Classes of tyre
5 General
6 Test site
9 7 Instrumentation
7.1 Instrumentation for acoustical measurements
7.2 Microphones
7.3 Temperature measurement
7.3.1 General
10 7.3.2 Air temperature
7.3.3 Test surface temperature
7.4 Wind measurement
7.5 Speed measurement
8 Meteorological conditions and background sound
8.1 Meteorological conditions
8.2 Temperature correction
11 8.3 Background sound pressure level
9 Preparation and adjustments with respect to tyres
12 10 Vehicle method
10.1 General
10.1.1 Test vehicle
10.1.2 Wheel base
10.1.3 Other measures to minimize vehicle influence on measurements
10.1.4 Tyre load
13 10.1.5 Tyre inflation pressure
10.1.6 Vehicle operating condition
10.1.7 Speed range
10.1.8 Sound pressure level readings
14 10.1.9 Number of measurements
10.1.10  Recommended frequency spectrum measurement
10.2 Data processing
10.2.1 Temperature correction
10.2.2 Reference speeds
10.2.3 Normalization with respect to speed
15 10.3 Test report
18 Bibliography

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BS ISO 13325:2019
$102.76