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BS ISO 362-3:2022

BS ISO 362-3:2022

$215.11

Acoustics. Measurement of noise emitted by accelerating road vehicles. Engineering method – Indoor testing M and N categories

Published By Publication Date Number of Pages
BSI 2022 74
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PDF Catalog

PDF Pages PDF Title
2 National foreword
7 Foreword
8 Introduction
9 1 Scope
2 Normative references
10 3 Terms and definitions
4 Symbols and abbreviated terms
12 5 Acceleration for vehicles of categories M1 and M2 having a maximum authorized mass not exceeding 3 500 kg, and of category N1
5.1 Applicability and conditions
13 5.2 Calculation of acceleration
5.2.1 Calculation procedure for vehicles with manual transmission, automatic transmission, adaptive transmission, and continuously variable transmission (CVT) tested with locked gear ratios
5.2.2 Calculation procedure for vehicles with automatic transmission, adaptive transmission, and CVT tested with non-locked gear ratios
5.3 Calculation of the target acceleration
5.4 Calculation of the reference acceleration
5.5 Partial power factor, kP
14 6 Instrumentation
6.1 Instruments for acoustical measurement
6.1.1 General
6.1.2 Calibration
15 6.2 Conformity with requirements
6.3 Instrumentation for speed measurement
6.4 Meteorological instrumentation
7 Test room requirements
7.1 General
16 7.2 Test room dimensions
18 7.2.1 Test room dimensions for measurements where the length of the test track is greater than 20m
19 7.3 Acoustical qualification of the room
7.3.1 General
7.3.2 Validation of free-field conditions of the microphone array
22 7.3.3 Qualification procedure
23 7.4 Condition of the floor
7.5 Cooling, ventilation, air temperature, exhaust gas management
7.6 Background noise
24 8 Dynamometer requirements
8.1 Type of texture of the rollers
8.2 Diameter of the rollers
8.3 Reproducibility of the pass-by dynamics
25 8.4 Single-axle or multi-axle operation
8.5 Noise emission limit under operating conditions produced by the dynamometer rollers
9 Test procedures
9.1 General
9.2 Microphone array — Hardware and software
26 9.3 Vehicle fixing system
9.4 Conditions of the vehicle
9.4.1 General conditions
9.4.2 Test mass of the vehicle
27 9.4.3 Tyre selection and tyre condition
9.4.4 Calculation of total engine power
9.4.5 Battery state of charge
9.4.6 Additional sound emitting devices
9.4.7 Vehicle cooling fans or cooling systems
28 9.5 Operating conditions
9.5.1 Vehicles of categories M1, M2 having a maximum authorized mass not exceeding 3 500 kg, and N1
29 9.5.2 Vehicles of categories M2 having a maximum authorized mass exceeding 3 500 kg, M3, N2 and N3
9.6 Measurement readings and reported values
9.6.1 General
30 9.6.2 Data compilation
9.6.3 Vehicles of categories M1 and M2 having a maximum authorized mass not exceeding 3 500 kg, and of category N1
9.6.4 Vehicles of categories M2 having a maximum authorized mass exceeding 3 500 kg, M3, N2, and N3
9.7 Measurement uncertainty
31 10 Test methods and test report
10.1 General
10.2 Variant A
10.2.1 General
32 10.2.2 Power train noise
10.2.3 Tyre/road noise
10.2.4 Calculation of the total vehicle noise using variant A
10.3 Test report
34 Annex A (normative) Validation of method
38 Annex B (normative) Procedure for measurement, evaluation, and calculation of tyre/road noise when using variant A
55 Annex C (informative) Procedure for description of tyre torque influence by an energetic model
60 Annex D (informative) Procedure for measurement, evaluation, and calculation of tyre/road noise when using variant B
62 Annex E (informative) Measurement uncertainty — Framework for analysis according to ISO/IEC Guide 98‑3
70 Annex F (informative) Room length deviation from recommendation
72 Bibliography

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BS ISO 362-3:2022
$215.11