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BS ISO 20908:2023

BS ISO 20908:2023

$189.07

Tyre sound emission test. Methods of drum

Published By Publication Date Number of Pages
BSI 2023 48
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PDF Catalog

PDF Pages PDF Title
2 National foreword
7 Foreword
8 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
10 4 Symbols and abbreviated terms
12 5 Instrumentation
5.1 Instruments for acoustical measurement
5.2 Microphones
13 5.3 Temperature measurement
5.3.1 General
5.3.2 Room temperature
5.3.3 Calibration
5.4 Conformity with requirements
6 Test room requirements
6.1 General
14 6.2 Microphone array setup
6.2.1 General
15 6.2.2 Linear array
16 6.2.3 Circular array
17 6.2.4 One microphone measurement set up
18 6.3 Far field conditions
6.4 Test room dimensions
6.5 Acoustical qualification of the room
6.5.1 General
6.5.2 Validation of the inverse square law on lines from the centre of the room to microphone position
20 6.5.3 Validation of the inverse square law with at least one line from the centre of the room to a microphone position and the points of concern of the microphone arrays
21 6.5.4 Validation of the inverse square law along the complete microphone array
23 6.5.5 Qualification procedure
6.6 Condition of the floor
6.7 Cooling, ventilation, room temperature
24 6.8 Background noise
7 Drum, drum surface and loading device requirements
7.1 Tyre loading device
7.2 Drum characteristics
7.2.1 Drum diameter
7.2.2 Drum width
7.2.3 Height of the drum top point above the floor
7.2.4 Drum speed
7.3 Tyre condition
7.4 Drum surface
25 7.5 Tyre pressure measurement device
8 Preparation and adjustments with respect to tyres
26 9 Test method and report
9.1 General
9.1.1 Tyre load
9.1.2 Tyre pressure
9.1.3 Thermal conditioning
9.1.4 Speed range
9.2 Data processing
9.2.1 Data pre-treatment
27 9.2.2 Normalization with respect to distance
9.2.3 Emulation of fast time weighting
9.2.4 Normalization with respect to number of tyres, tyre masking effect and vehicle impact
28 9.2.5 Normalization with respect to speed
29 9.2.6 Correlation with outdoor measurement
9.2.7 Adjustment of the reported value
10 Test report
31 11 Validation method and alignment coefficient to outdoor measurement
11.1 Correlation with outdoor reference measurement using ISO 13325 method
32 11.2 Alignment process
33 11.3 Correction coefficients
11.3.1 Correction coefficients calculation
11.3.2 Correlation coefficient calculation
34 11.3.3 Correction coefficients usage
11.4 Measurement stability among time
12 Measurement uncertainty
36 Annex A (informative) Measurement uncertainty — Framework for analysis according to ISO/IEC Guide 98-3
38 Annex B (informative) Normalization with respect to number of tyres, tyre masking effect, and vehicle impact
46 Bibliography

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BS ISO 20908:2023
$189.07