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BS ISO 362-3:2022 Acoustics. Measurement of noise emitted by accelerating road vehicles. Engineering method - Indoor testing M and N categories, 2022
- National foreword
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Symbols and abbreviated terms
- 5 Acceleration for vehicles of categories M1 and M2 having a maximum authorized mass not exceeding 3 500 kg, and of category N1 [Go to Page]
- 5.1 Applicability and conditions
- 5.2 Calculation of acceleration [Go to Page]
- 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
- 6 Instrumentation [Go to Page]
- 6.1 Instruments for acoustical measurement [Go to Page]
- 6.1.1 General
- 6.1.2 Calibration
- 6.2 Conformity with requirements
- 6.3 Instrumentation for speed measurement
- 6.4 Meteorological instrumentation
- 7 Test room requirements [Go to Page]
- 7.1 General
- 7.2 Test room dimensions [Go to Page]
- 7.2.1 Test room dimensions for measurements where the length of the test track is greater than 20m
- 7.3 Acoustical qualification of the room [Go to Page]
- 7.3.1 General
- 7.3.2 Validation of free-field conditions of the microphone array
- 7.3.3 Qualification procedure
- 7.4 Condition of the floor
- 7.5 Cooling, ventilation, air temperature, exhaust gas management
- 7.6 Background noise
- 8 Dynamometer requirements [Go to Page]
- 8.1 Type of texture of the rollers
- 8.2 Diameter of the rollers
- 8.3 Reproducibility of the pass-by dynamics
- 8.4 Single-axle or multi-axle operation
- 8.5 Noise emission limit under operating conditions produced by the dynamometer rollers
- 9 Test procedures [Go to Page]
- 9.1 General
- 9.2 Microphone array — Hardware and software
- 9.3 Vehicle fixing system
- 9.4 Conditions of the vehicle [Go to Page]
- 9.4.1 General conditions
- 9.4.2 Test mass of the vehicle
- 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
- 9.5 Operating conditions [Go to Page]
- 9.5.1 Vehicles of categories M1, M2 having a maximum authorized mass not exceeding 3 500 kg, and N1
- 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 [Go to Page]
- 9.6.1 General
- 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
- 10 Test methods and test report [Go to Page]
- 10.1 General
- 10.2 Variant A [Go to Page]
- 10.2.1 General
- 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
- Annex A (normative) Validation of method
- Annex B (normative) Procedure for measurement, evaluation, and calculation of tyre/road noise when using variant A
- Annex C (informative) Procedure for description of tyre torque influence by an energetic model
- Annex D (informative) Procedure for measurement, evaluation, and calculation of tyre/road noise when using variant B
- Annex E (informative) Measurement uncertainty — Framework for analysis according to ISO/IEC Guide 98‑3
- Annex F (informative) Room length deviation from recommendation
- Bibliography [Go to Page]
