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GB 24929-2010: Limit and measurement method of noise emitted by accelerating all-terrain vehicles
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Limit and measurement method of noise emitted by accelerating all-terrain vehicles
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GB 24929-2010
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Basic data | Standard ID | GB 24929-2010 (GB24929-2010) | | Description (Translated English) | Limit and measurement method of noise emitted by accelerating all-terrain vehicles | | Sector / Industry | National Standard | | Classification of Chinese Standard | Z32 | | Classification of International Standard | 13.140 | | Word Count Estimation | 9,924 | | Date of Issue | 2010-06-18 | | Date of Implementation | 2011-01-01 | | Quoted Standard | GB/T 3785; GB/T 5378; GB/T 15173; GB 16169-2005; GB/T 24936 | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 3, 2010 (No. 158 overall) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This Chinese standard specifies the all-terrain vehicle acceleration with noise limits and measurement methods. This standard does not apply to non-road all-terrain vehicles and special all-terrain vehicles. This standard applies to all-terrain vehicle type approval and production consistency checks. | GB 24929-2010: Limit and measurement method of noise emitted by accelerating all-terrain vehicles
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Limit and measurement method of noise emitted by accelerating all-terrain vehicles
ICS 13.140
Z32
National Standards of People's Republic of China
ATVs with acceleration noise
Limits and methods of measurement
Issued on. 2010-08-09
2011-01-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Table of Contents
Introduction Ⅲ
1 Scope 1
2 Normative references 1
3 Terms and definitions
4 1 accelerated with noise limits
5 measuring instruments 2
6 Acceleration Running Noise Test Method 2
Appendix A (informative) acceleration with noise measurement records 5
Foreword
The standard Chapter 4, Chapter 5 and Chapter 6 are mandatory, the rest are recommended.
Appendix A of this standard is an informative annex.
The standard four all-terrain vehicle by the National Standardization Technical Committee (SAC/TC344) and focal points.
This standard is drafted by. Shanghai Motor Vehicle Inspection Center.
Participated in the drafting of this standard. Chongqing Jianshe Motorcycle Co., Ltd., the National Motorcycle Quality Supervision and Inspection Center (Chongqing), Zhejiang
Xingyue Group Co., Ltd., Hangzhou Chunfeng Holdings Group Motorcycle Manufacturing Co., China Quality Certification Center, Chongqing Astronautic Bashan Motorcycle
Manufacturing Co., step Yang Group Limited.
The main drafters of this standard. Miao Wenquan, Jiang Yong, Zhou plot, Lian, Bo Jun, ZHAO Yong Zhou, Zhang, Zhu Zhu, Chen Xiangyang, Zhang Ping.
The standard implementation of the transition period. the first stage of implementation of the standard after six month; the second phase of the implementation of the standard 30 months after the date onwards.
ATVs with acceleration noise
Limits and methods of measurement
1 Scope
This standard specifies the all-terrain vehicle acceleration with noise limits and measurement methods.
This standard does not apply to non-road all-terrain vehicles and special all-terrain vehicle.
This standard applies to all-terrain vehicle type approval and production consistency check.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Can you use the latest versions of these files. For undated reference documents, the latest versions apply to this standard.
GB/T 3785 sound level meter electric, acoustic performance and test methods
GB/T 5378 motorcycles and road test method
GB/T 15173 electric acoustic sound calibrators (GB/T 15173-2010, IEC 60942.2003, IDT)
GB 16169-2005 motorcycles and accelerated with noise limits and measurement methods
GB/T 24936 ATVs term
3 Terms and Definitions
In GB/T 24936 and established the following terms and definitions apply to this standard.
3.1
Type approval test testfortype-approval
Production enterprises manufacturing all-terrain vehicle type approval tests of new models by the provisions of.
3.2
Conformity of Production tests testforconsistencyoftheproductinspection
The test type approval test approved ATVs mass production vehicle models produced by the provisions of the consistency check.
3.3
Background noise ambientnoise
Background noise refers to the ambient noise (including wind noise) test vehicle noise does not exist.
4 Acceleration with noise limits
4.1 Noise limit the type approval test
The internal combustion engine as a power source using all-terrain vehicle type approval test accelerated with noise limits in Table 1, the pure electric drive as a power source
The all-terrain vehicle type approval test acceleration noise limits in Table 2, the use of hybrid ATVs its power source, respectively assessment.
4.2 Production consistency check test noise limits
ATVs various stages of production consistency check test implementation date and the same type approval testing, production consistency check test acceleration
With noise limits than the type approval test acceleration with high noise limits 1dB (A), and the production consistency check test noise measured value
It should not exceed the type approval test measured noise value plus 3dB (A).
4.3 Other Requirements
Equipped with sound-absorbing material fiber exhaust muffler system of all-terrain vehicles should be consistent with GB 16169-2005 Appendix A requirements.
All-terrain vehicle type approval test in Table 1 with an internal combustion engine powered acceleration noise limits
Engine Displacement/mL
Noise Limit/dB (A)
The second stage of the first phase
≤50 78 76
> 50 and < 17 580
≥175 82
Table 2 electric all-terrain vehicle type approval test accelerated with noise limits
ATVs Type Noise Limit/dB (A)
Motor maximum continuous power ≤4kW 76
Motor maximum continuous power > 4kW 80
5 Measuring Instruments
5.1 Acoustic measuring instruments
5.1.1 for measuring the sound level of the sound level meter or equivalent measurement system should be consistent with GB/T 3785 type 1 precision sound level meter requirements.
Note. Whenever possible, use the extension rods and extension cables.
5.1.2 At the beginning and end of each series of measurements, use a suitable sound source (such as a piston sound meter) according to GB/T 15173 requirements
Checked and calibrated sound level meter. Use Sound Level Meters "fast (F)" profile Time weighting characteristics and "A" frequency weighting characteristics measurement measurements.
5.1.3 measurement process, should be required to use the sound level meter windshield instructions correctly, it should be noted windshield on the microphone sensitivity
And directional influence.
5.2 vehicle speed and engine speed measuring instruments
You should use a dedicated vehicle speed and engine tachometer measuring instruments, which should be consistent with the requirements of GB/T 5378 regulations.
5.3 Meteorological measuring instruments
Anemometer, air pressure gauge and a thermometer should be consistent with GB/T 5378 regulations.
6 accelerated running noise test method
6.1 Measurement Environment
6.1.1 measurement site (FIG. 1)
Center 6.1.1.1 to survey the site should be a solid flat area surrounding the detection of the acceleration parts, this central acceleration section should be flat;
Its surface should be dry, there should be no snow, dirt or similar sound absorbing material covered. Detecting road surface coating should be consistent with GB 16169-2005
Appendix B requirements.
6.1.1.2 on the measuring site, accelerated change free-field sound source and the microphone part of the center should not exceed 1dB (A).
If the center portion 50m in the acceleration range, no large sound reflecting objects, such as buildings, fences, rocks, bridges, trees and parked
Vehicle, can be considered for this condition is satisfied.
6.1.1.3 should not in any way that could affect the sound field microphone barrier, no one should stand between the microphone and the sound source, the measurement
Own work stations observers should not affect the readings measuring device.
6.1.2 Meteorology
Measurement should be no rain, no snow and the wind speed of not more than 3m/s climatic conditions. Excluding the impact should be measured gusts of sound level meter readings.
6.1.3 Background noise
The measurement process, the A-weighted sound level of sound sources influence the detection of the vehicle other than the wind formed (background noise) ratio should be at least test the whole earth
Noise generated by the car-shaped low 10dB (A) above. If the difference between the ambient noise and the measured noise is between 10dB (A) ~ 16dB (A) of the
Room noise measured value of the test vehicle shall be reduced by the correction value shown in Figure 2.
In meters
1 with noise measurement site, measurement region and microphone arrangement
Figure 2 correction value of the background noise
6.2 Vehicle Condition
6.2.1 During the measurement, the test vehicle in addition to a pilot, shall not load and without people, vehicles should be in working order (including cooling
Fluid, lubricants, fuel, tools, spare wheel). The total mass of the driver and their equipment should be between 75kg ~ 80kg, if necessary, increase
Additional weights of 75kg to meet the minimum requirements.
6.2.2 If the test subject is equipped with automatic fans, in the measurement process, this system should be undisturbed.
6.2.3 before measuring, speed warm-up test shall be subject to the normal operation, and the vehicle engine to reach normal operating temperature.
6.3 Measurement Methods
6.3.1 The nature and number of measurements
When traveling vehicle line AA 'and BB' between the measurement of A-weighted decibel [dB (A)] represents the maximum sound level. If the record
Between the maximum value and the general sound level difference abnormally recorded, this measurement is invalid. On each side of the vehicle should be at least 2 measurements.
6.3.2 microphone position
The microphone should be placed away from the runway reference line CC '(FIG. 1) 7.5m ± 0.2m above the ground and at a position 1.2m ± 0.1m
on. Microphone reference axis parallel to the ground and perpendicular point line CC '.
6.3.3 with the operating conditions
By gear and test shall be specified in the initial steady speed 6.3.4 approaching AA 'line speed tolerance of ± 3%.
When the front end of the vehicle approaching AA 'line, as far as possible to the motor controller or the throttle fully open, and held in the fully open position;
When the trailing end of the vehicle reaches the line BB ', then, as soon as possible to return the throttle to idle position or motor controller will return to the closed position
Set on.
In the whole process of measurement, the vehicle should be traveling straight over the acceleration section keeping the longitudinal center plane of the vehicle as close to the line CC '.
6.3.4 Test line speed used
6.3.4.1 In the internal combustion engine as the power source of all-terrain vehicles
6.3.4.1.1 ATVs without transmission
The test vehicle shall be the maximum power of the engine speed matches the speed of 3/4 steady speed, or to allow the engine governor
3/4 of the maximum speed of the speed matching a steady speed, or to 50km/h speed close to the line AA ', whichever is the lowest one speed.
6.3.4.1.2 equipped with hand (foot) automatic transmission ATVs
If the test vehicle has 4 or less transmission gear ratio, you should use the second gear measurement.
If the transmission has five or more gear ratios, third gear should be used for measurement.
If you reach the BB 'line engine speed exceeds the maximum power speed, you should choose the 2 block 3 and block outside in close proximity to high gear
Bit, this gear can without exceeding the value of the maximum power speed, reaches line BB 'on the runway. Should not be selected overdrive. If the car
Vehicles with dual-stage main transmission, the selected gear ratio and the maximum speed gear of the vehicle should be consistent.
The test vehicle shall be the maximum power of the engine speed matches the speed of 3/4 steady speed, or to allow the engine governor
3/4 of the maximum speed of the speed matching a steady speed, or to 50km/h speed close to the line AA ', whichever is the lowest speed.
6.3.4.1.3 with automatic transmission ATVs
The test vehicle shall be 50km/h or three-quarters of its maximum speed stable speed approaching AA 'line, whichever is lower vehicle speed. in
When you can choose from several forward range, they should choose between line AA 'and BB' line can produce the highest average acceleration of the vehicle gear.
Only then it should not be used in braking, parking or similar low-speed movement of the selected gear position.
6.3.4.2 In electric power source for driving ATVs
The test vehicle shall be 50km/h or three-quarters of its maximum speed stable speed approaching AA 'line, whichever is lower vehicle speed.
6.3.4.3 hybrid drive ATVs
Manual switching mode power-driven ATVs provisions of 6.3.4.1 and 6.3.4.2 respectively performed. Powered automatic switching parties
According to their type of vehicle reaches a predetermined line drive mode when a steady speed test, and shall be stated in the report.
6.4 Value Requirements
6.4.1 should adopt readings rounded to the nearest integer decibel.
If the number after the decimal point is between 0 and 4, the figures after the decimal point should be rounded down; if it is between 5 and 9, the carry.
6.4.2 If the results of two consecutive measurements on the same side of the vehicle exceeds 2dB (A), the measurement is invalid.
6.4.3 Consider measurement accuracy uncertainty will each reading measured minus 1dB (A) as a measurement result.
6.4.4 The average of four measurements (to one decimal place) as that of the acceleration test with the maximum noise level.
6.4.5 hybrid all-terrain vehicle to take the larger of the two results as that of the acceleration test with the maximum noise level.
6.5 Measurement Record
Measurement data and results of measurement conditions, that is test and measurement instruments and other technical parameters to fill in the Appendix A table. If there is
Note the case, should fill in the "Additional Notes" column.
Appendix A
(Informative)
Acceleration with noise measurement records
Location Date The date road conditions
Weather Temperature/℃ wind speed/(m/s)
By commissioning. factory model
VIN designed maximum speed/(km/h) final drive ratio
Engine. Type Displacement/mL number
Maximum power/kW Maximum power speed/(r/min)
Transmission. Type the number of forward gear
Exhaust muffler system. factory Rockwoll Test method
Tyres. front wheel specifications
Pressure (kPa). front wheel
Sound Level Meter. Model accuracy class instrument number
Measured before calibration value (dB) measurement calibration value (dB) assay calibration value (dB)
Acoustic Calibrator. Model accuracy class instrument number
Speed measuring device models tachometer Model
Gear
microphone
position
frequency
Engine speed/(r/min)
[Or speed/(km/h)]
Into line outlet
Measurements/
dB (A)
average value/
dB (A)
Background noise /
dB (A)
Remark
The left
Right
The left
Right
Accelerated with the maximum noise level dB (A)
Checking of surveyors driver
Description road test
other instructions
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