GB/T 44040-2024 Measurement methods for noise emitted by heavy-duty vehicles in multiple driving mode conditions
1 Scope
This document specifies the terms and definitions, measuring instruments, measuring conditions, measurement requirements and methods for measuring noise emitted by heavy-duty vehicles in multiple driving mode conditions.
This document is applicable to the measurement of noise emitted by Categories M3, N2, and N3 vehicles, as well as Category M2 vehicles with a maximum total mass greater than 3,500kg in multiple driving mode conditions.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 3730.1 Terms and definitions of motor vehicles, trailers and combination vehicle - Part 1: Types
GB/T 3730.2 Road vehicle - Masses - Vocabulary and codes
GB/T 12534 Motor vehicles - General rules of road test method
GB/T 15089 Classification of power-driven vehicles and trailers
GB/T 15173 Electroacoustics - Sound calibrators
GB/T 19596 Terminology of electric vehicles
GB/T 22157 Acoustics - Specification of test tracks for measuring noise emitted by road vehicles and their tyres
GB/T 38146.2 China automotive test cycle - Part 2: Heavy-duty commercial vehicles
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 3730.1, GB/T 3730.2, GB/T 15089, GB/T 19596 and GB/T 38146.2 as well as the following ones apply.
3.1
test mass
mt
mass of different types of test vehicles used for noise testing after being loaded according to different load conditions
Note: The unit is kilograms (kg).
3.2
total power of vehicle
Pn
total power of all power sources directly involved in driving the vehicle
Note 1: The unit is kilowatts (kW).
Note 2: The total power of vehicles using fuel engines refers to the maximum net power of engines measured according to GB/T 17692. For battery electric vehicles, it refers to the sum of the peak power of all drive motors measured according to GB/T 18488.2. For hybrid electric vehicles, it refers to the sum of the maximum net power of the engine measured according to GB/T 17692 and the peak power of the drive motor(s) measured according to GB/T 18488.2. For fuel cell vehicles, it refers to the peak power of the drive motor(s) measured according to GB/T 24554.
3.3
engine speed at maximum net power
S
speed of engine when it outputs the maximum net power, as specified in GB/T 17692
Note 1: The unit is revolutions per minute (r/min).
Note 2: If the maximum net power can be achieved at multiple engine speeds, the highest speed corresponding to the maximum net power is considered the engine speed at maximum net power.
3.4
reference point
locating point used to represent the position of a test vehicle during noise measurements
Note 1: For test vehicles with a front-mounted engine (or drive motor), the reference point is the foremost point of the test vehicle. For test vehicles with a mid-mounted or rear-mounted engine (or drive motor), the reference point is the edge of the engine (or drive motor) closest to the forward driving direction of the test vehicle.
Note 2: For test vehicles with multiple drive motors, if the main drive motor or the forward-positioned drive motor (in cases where multiple drive motors have equal power) is front-mounted, the reference point is the foremost point of the test vehicle. If the main drive motor or the forward-positioned drive motor is mid-mounted or rear-mounted, the reference point is the edge of the main or forward-positioned drive motor closest to the forward driving direction of the test vehicle.
4 Measuring instrument
4.1 Acoustic measuring instrument
The sound level meters or other equivalent measuring systems used for measurement shall meet the requirements for Level 1 sound level meters as specified in GB/T 3785.1 (windscreen shall be included, if applicable). During measurement, the "F" time-weighting characteristic and "A" frequency-weighting characteristic of sound level meter shall be used. If a sound level meter or measuring system capable of automatically capturing "A"-weighted sound pressure levels is used, the reading time interval shall not exceed 30ms.
4.2 Calibration of acoustic measuring instrument
Before and after the measurement, the acoustic measuring instrument shall be calibrated using a Level 1 acoustic calibrator compliant with GB/T 15173. Without making any further adjustments, if the difference between the post-test calibration reading and the pre-test calibration reading exceeds 0.5dB(A), the measurement results obtained after the pre-test calibration shall be considered invalid.
4.3 Other measuring instruments
The measuring instruments shall include the following equipment, with accuracies meeting the following requirements:
a) Tachometer: ±2%;
b) Vehicle speed measuring instrument: ±0.5%;
c) Thermometer: ±1℃;
d) Anemometer: ±1.0m/s;
e) Barometer: ±0.5kPa;
f) Relative humidity meter: ±5%;
g) Tyre gauge: ±10kPa.
Contents 1 Scope 2 Normative references 3 Terms and definitions 4 Measuring instrument 5 Measuring conditions 6 Measurement requirements and methods Annex A (Informative) Record form for measurement of noise emitted by heavy-duty vehicles in multiple driving mode conditions Bibliography
GB/T 44040-2024 Measurement methods for noise emitted by heavy-duty vehicles in multiple driving mode conditions
1 Scope
This document specifies the terms and definitions, measuring instruments, measuring conditions, measurement requirements and methods for measuring noise emitted by heavy-duty vehicles in multiple driving mode conditions.
This document is applicable to the measurement of noise emitted by Categories M3, N2, and N3 vehicles, as well as Category M2 vehicles with a maximum total mass greater than 3,500kg in multiple driving mode conditions.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 3730.1 Terms and definitions of motor vehicles, trailers and combination vehicle - Part 1: Types
GB/T 3730.2 Road vehicle - Masses - Vocabulary and codes
GB/T 3785.1 Electroacoustics - Sound level meters - Part 1: Specifications
GB/T 12534 Motor vehicles - General rules of road test method
GB/T 15089 Classification of power-driven vehicles and trailers
GB/T 15173 Electroacoustics - Sound calibrators
GB/T 19596 Terminology of electric vehicles
GB/T 22157 Acoustics - Specification of test tracks for measuring noise emitted by road vehicles and their tyres
GB/T 38146.2 China automotive test cycle - Part 2: Heavy-duty commercial vehicles
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 3730.1, GB/T 3730.2, GB/T 15089, GB/T 19596 and GB/T 38146.2 as well as the following ones apply.
3.1
test mass
mt
mass of different types of test vehicles used for noise testing after being loaded according to different load conditions
Note: The unit is kilograms (kg).
3.2
total power of vehicle
Pn
total power of all power sources directly involved in driving the vehicle
Note 1: The unit is kilowatts (kW).
Note 2: The total power of vehicles using fuel engines refers to the maximum net power of engines measured according to GB/T 17692. For battery electric vehicles, it refers to the sum of the peak power of all drive motors measured according to GB/T 18488.2. For hybrid electric vehicles, it refers to the sum of the maximum net power of the engine measured according to GB/T 17692 and the peak power of the drive motor(s) measured according to GB/T 18488.2. For fuel cell vehicles, it refers to the peak power of the drive motor(s) measured according to GB/T 24554.
3.3
engine speed at maximum net power
S
speed of engine when it outputs the maximum net power, as specified in GB/T 17692
Note 1: The unit is revolutions per minute (r/min).
Note 2: If the maximum net power can be achieved at multiple engine speeds, the highest speed corresponding to the maximum net power is considered the engine speed at maximum net power.
3.4
reference point
locating point used to represent the position of a test vehicle during noise measurements
Note 1: For test vehicles with a front-mounted engine (or drive motor), the reference point is the foremost point of the test vehicle. For test vehicles with a mid-mounted or rear-mounted engine (or drive motor), the reference point is the edge of the engine (or drive motor) closest to the forward driving direction of the test vehicle.
Note 2: For test vehicles with multiple drive motors, if the main drive motor or the forward-positioned drive motor (in cases where multiple drive motors have equal power) is front-mounted, the reference point is the foremost point of the test vehicle. If the main drive motor or the forward-positioned drive motor is mid-mounted or rear-mounted, the reference point is the edge of the main or forward-positioned drive motor closest to the forward driving direction of the test vehicle.
4 Measuring instrument
4.1 Acoustic measuring instrument
The sound level meters or other equivalent measuring systems used for measurement shall meet the requirements for Level 1 sound level meters as specified in GB/T 3785.1 (windscreen shall be included, if applicable). During measurement, the "F" time-weighting characteristic and "A" frequency-weighting characteristic of sound level meter shall be used. If a sound level meter or measuring system capable of automatically capturing "A"-weighted sound pressure levels is used, the reading time interval shall not exceed 30ms.
4.2 Calibration of acoustic measuring instrument
Before and after the measurement, the acoustic measuring instrument shall be calibrated using a Level 1 acoustic calibrator compliant with GB/T 15173. Without making any further adjustments, if the difference between the post-test calibration reading and the pre-test calibration reading exceeds 0.5dB(A), the measurement results obtained after the pre-test calibration shall be considered invalid.
4.3 Other measuring instruments
The measuring instruments shall include the following equipment, with accuracies meeting the following requirements:
a) Tachometer: ±2%;
b) Vehicle speed measuring instrument: ±0.5%;
c) Thermometer: ±1℃;
d) Anemometer: ±1.0m/s;
e) Barometer: ±0.5kPa;
f) Relative humidity meter: ±5%;
g) Tyre gauge: ±10kPa.
Contents of GB/T 44040-2024
Contents
1 Scope
2 Normative references
3 Terms and definitions
4 Measuring instrument
5 Measuring conditions
6 Measurement requirements and methods
Annex A (Informative) Record form for measurement of noise emitted by heavy-duty vehicles in multiple driving mode conditions
Bibliography
