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BS ISO 362-1:2022 Acoustics. Engineering method for measurement of noise emitted by accelerating road vehicles - M and N categories, 2022
- National foreword
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions [Go to Page]
- 3.1 Vehicle mass
- 3.4 Vehicle categories
- 4 Symbols, terms and abbreviated terms
- 5 Specification of the 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 General
- 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
- 6.1.3 Conformity with requirements
- 6.2 Instrumentation for speed measurements
- 6.3 Meteorological instrumentation
- 7 Acoustical environment, meteorological conditions, and background noise [Go to Page]
- 7.1 Test site
- 7.2 Meteorological conditions
- 7.3 Background noise
- 8 Test procedures [Go to Page]
- 8.1 Microphone positions
- 8.2 Conditions of the vehicle [Go to Page]
- 8.2.1 General conditions
- 8.2.2 Test mass of the vehicle
- 8.2.3 Tyre selection and condition
- 8.2.4 Calculation of total engine power
- 8.2.5 Battery state of charge
- 8.2.6 Additional sound emitting devices
- 8.2.7 Vehicle cooling fans or cooling systems
- 8.3 Operating conditions [Go to Page]
- 8.3.1 Vehicles of categories M1 and M2 having a maximum authorized mass not exceeding 3 500 kg and category N1
- 8.3.2 Vehicles of category M2 having a maximum authorized mass exceeding 3 500 kg, and categories M3, N2 and N3
- 8.4 Measurement readings and reported values [Go to Page]
- 8.4.1 General
- 8.4.2 Data compilation
- 8.4.3 Vehicles of categories M1 and M2 having a maximum authorized mass not exceeding 3 500 kg and category N1
- 8.4.4 Vehicles of category M2 having a maximum authorized mass exceeding 3 500 kg and categories M3, N2, and N3
- 8.5 Measurement uncertainty
- 9 Test report
- Annex A (informative) Technical background for development of vehicle noise test procedure based on in-use operation in urban conditions
- Annex B (informative) Measurement uncertainty — Framework for analysis according to ISO/IEC Guide 98‑3
- Annex C (informative) Flowchart of the procedure for categories M1 and M2 having a maximum authorized mass not exceeding 3 500 kg and category N1
- Annex D (informative) Flowchart for vehicles of category M2 having a maximum authorized mass exceeding 3 500 kg and categories M3, N2, and N3 with locked gears
- Annex E (informative) Flowchart for vehicles of category M2 having a maximum authorized mass exceeding 3 500 kg and categories M3, N2, and N3 with non-locked gears
- Annex F (informative) Flowchart for vehicles of category M2 having a maximum authorized mass exceeding 3 500 kg and categories M3, N2, and N3 with no rotational engine speed available
- Bibliography [Go to Page]
