GB 19757-2005Limits and measurement methods for noise emitted by accelerating tri-wheel and low-speed vehicle (English PDF)

Foreword

To implement the "People's Republic of China Environmental Protection Law" and "People's Republic of China Environmental Noise Pollution Prevention Law," three controls

Cars and trucks low noise emissions and protect the environment, the development of this standard.

This standard is based on GB 7258-2004 "safe operation of motor vehicles technical conditions" will "three farm vehicles" was renamed "three

Car ", the" four-wheel farm vehicles "was renamed" low-speed vehicles. "

This standard specifies two accelerated with the implementation phase of the three-wheeled vehicles and low-speed vehicle type approval and production tests of consistency checks

Exterior noise limits and measurement methods.

The date of promulgation of this standard instead of GB 18321-2001 "Noise Limits Farm Transporter" and GB/T 19118-2003 "farming

With truck noise measurement methods "on farm vehicles accelerated with the contents of the vehicle noise limits and measurement methods, and GB

18321-2001 and GB/T 19118-2003 compared to the main changes are as follows.

--- Farm vehicles will accelerate with exterior noise measurement requirements for sound level meter from type 2 to type 1;

--- For farm vehicles with vehicle acceleration noise measurement conditions were reasonable adjustment;

--- Will take on the biggest record results for the measured time with a predetermined acceleration farm vehicles exterior noise values, to pick up the car

The average vehicle on both sides of the greater value of the measured acceleration of the vehicle with the maximum vehicle noise value.

Appendix A of this standard is a normative appendix, Appendix B is an informative annex.

According to relevant laws and regulations, the standard shall be enforceable.

This standard was proposed by the State Environmental Protection Administration of Science, Technology.

This standard was drafted by the Development Research Center of China Agricultural Vehicles Environmental Science Research Institute of the atmosphere, the machinery industry.

This standard is approved by the State Environmental Protection Administration May 30, 2005.

This standard since July 1, 2005 implementation.

This standard is interpreted by the State Environmental Protection Administration.

Book GB 19757 2005

Three-wheeled vehicles and low-speed vehicles with vehicle acceleration noise limits and measurement methods

(China I, II stage)

1 Scope

This standard specifies the three-wheeled vehicles and low-speed vehicles with vehicle acceleration noise limits and measurement methods.

This standard applies to three-wheeled vehicles and low-speed 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, subsequently

Some amendments (excluding corrections) or revisions do not apply to this standard, however, encourage an agreement in accordance with this standard

Parties to study the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.

GB 7258 Safety requirements for operation of motor vehicles

GB/T 3785 sound level meter electric, acoustic performance and test methods

GB/T 15173 acoustic calibrator

JB/T 7235 Test methods for four-wheel farm truck

JB/T 7237 Farm Fransport Test Method

GB 7258 Safety requirements for operation of motor vehicles

3 noise limits

Three cars or low-speed vehicles to accelerate with the vehicle shall comply with the noise limits specified in Table 1.

Table 1 three cars or low-speed vehicles with vehicle acceleration noise limits

Pilot implementation phase

Noise Limit/dB (A)

Multi-cylinder diesel engine mounted low-speed vehicles and low-speed trucks wheel vehicles mounted single-cylinder diesel engine

Type approval

Phase I <=83 <=84

The first phase of <=81 <=82 II

Conformity of Production

Phase I <=84 <=85

The first phase of <=82 <=83 II

4 type approval

Acceleration with 4.1 three cars or low-speed vehicles, the company should be made in line with the scope of application of this standard three-wheeled vehicles and low-speed trucks

Exterior noise emission levels, to the competent authorities responsible for vehicle type approval (hereinafter. the type approval authorities) proposed type of nuclear

Prospective applicants.

4.2 three cars or low-speed vehicles, the company or manufacturing units should be submitted three cars or low-speed vehicles and the main assembly of the vehicle, such as

Engine, clutch, transmission and other technical parameters, in particular, should be provided in relation to the design of the vehicle can function for noise control

And related technical documents.

4.3 application for three cars or low-speed vehicles to speed up traffic noise outside the car or the type approval, the company must submit a compliance with manufacturing units

The techniques described above prototype vehicle type approval by the competent authorities to entrust testing organization (hereinafter referred to as "detection means") for inspection.

Detecting mechanism should be the standard in Appendix A noise measured in accordance with Appendix B to record, complete the inspection of the contents of this standard. Detect

Agencies should test results issued by the test report and submitted to the type approval authorities.

GB 19757 2005

4.4 test results detecting means consistent with the standard three cars or low-speed vehicles type approval tests prescribed limits, it is considered qualified, whether

It was unqualified.

5 type-approval extension

5.1 three cars or low-speed vehicles to accelerate the vehicle with the vehicle noise type approval shall be extended to apply to the company or the type of manufacturing units

Type approved by the competent department.

5.2 Manufacturer or manufacturing units shall submit an application type detection mechanism is extended and extended models of vehicle models and key parts, such as

Engine, clutch, transmission and other technical parameters, in particular, should be provided in relation to the design of the vehicle can function for noise control

And related technical documents.

5.3 When necessary, manufacturers or manufacturing units shall submit detecting means meeting the above description of the prototype.

5.4 detection mechanism should be the standard requirements for type-approval extension test, to meet the conditions for type approval extended models issued

Test report and submitted to the type approval authorities. On three cars or low-speed vehicles to speed up traffic noise outside the car, in the following main

To respect there is no difference with the approved vehicle type approval models can be extended.

5.4.1 bodywork or structural materials (in particular the engine compartment and the insulation material).

6 Conformity of Production

6.1 pairs have been type approved and mass-produced vehicles, must take measures to ensure that the vehicle, system, component or separate technical integration and

Consistent with the approved type. Three cars or low-speed vehicles to accelerate the vehicle with the vehicle noise produced by the State Council administrative consistency check

The competent department of the.

6.2 from mass-produced three cars or low-speed vehicles at random like a car, by the relevant administrative departments under the State Council entrusted the subject

Measurement means for inspection.

6.3 detection mechanism should be the standard in Appendices A and B to complete the inspection of the contents of this standard. Detection means to deal with the test results issued by the detector

Report and submitted to the relevant administrative departments under the State Council.

6.4 test results detecting means consistent with the standard three cars or low-speed vehicles production limit for the consistency check is considered qualified.

Example 7 Standard

Specified in Table 2 since the implementation date of type approval, where accelerated with noise emission type approval of three-wheeled vehicles and low-speed vehicles

We must comply with this standard. Prior to the implementation date specified in Table 2, it can be carried out in accordance with the respective application type approval requirements of this standard

Please approve.

Table 2 Type approval execution date

The first stage of Phase II I

July 1, 2005 July 1, 2007

For according to the standards approved by the type-approval of three-wheeled vehicles and low-speed vehicles, production consistency check, the date of execution of approval.

Since then type approval specified in Table 2 execution date one year, all manufacturing and sales of three-wheeled vehicles and low-speed vehicles, which accelerated

With noise emissions must comply with the standards of production consistency check limits.

GB 19757 2005

Appendix A

(Normative)

Three-wheeled vehicles and low-speed vehicles with vehicle acceleration noise measurement method

A.1 Measuring Instruments

A.1.1 acoustic measurements

A.1.1.1 measured by sound level meter (including microphone and cable) or other equivalent measurement system should be consistent with GB/T 3785 stipulated 1

Type 1 sound level requirements.

A.1.1.2 measured before and after the application in line with GB/T 15173 stipulated Class 1 acoustic calibrator according to the procedure specified by the manufacturer to conduct sound level meter

calibration. In the absence of any further adjustments, if after reading a calibration relative difference between the previous calibration readings exceed 0.5dB,

Measurement result is considered invalid after the previous calibration. The actual sound level meter calibration readings should be recorded in Appendix B.

A.1.2 speed or speed measurement

Measurement should be used accuracy better than ± 2% of engine speed or vehicle speed measuring instruments to monitor the engine speed or vehicle speed, should not be used

Similar instruments on farm vehicles.

A.1.3 Measurement of meteorological parameters

Thermometer accurate measurement of the ambient temperature should be within ± 1 °C. Anemometer accuracy should be within ± 1.0m/s.

A.1.4 Other parameters measured

Other parameters, such as distance, accuracy should be used not less than ± 2% of the measuring instrument.

A.1.5 Instrument Effectiveness

All measuring instruments shall be regularly inspected according to the provisions of the relevant national metrology instruments, and used within the effective date of inspection.

A.2 Measurement Conditions

A.2.1 tested three cars or low-speed vehicles should meet the technical conditions JB/T 7235 "four-wheel farm truck", JB/T 7237 "three

The relevant provisions of farm vehicles "or GB 7258" operational safety and technical conditions "vehicles and vehicle technical documentation, measurement test three

Wheel cars or low-speed vehicles to be unloaded.

A.2.2 measuring site should be a quiet, open space horizontal (slope less than 0.5%), the site should be able to ensure sound noise

Deviation hemispherical propagation of the sound source and the microphone is not greater than ± 1dB (A). Meet the requirements of the acoustic field, it may be such a

Venues.

--- To measure the space center M (see Figure 1) anchored within a 50m radius of the range, there is no large sound reflecting objects, such as buildings,

Fences, rocks or bridges;

--- M to measure the space center anchored to the ground within a 10m radius of the range should be concrete, asphalt or similar hard materials

Road, there should be no snow, tall grass, loose soil or ash and other sound-absorbing material.

--- Between the measured sound level meter microphone and three cars or low-speed vehicles, not someone or other obstacles, observers should

Without prejudice to the position of the sound level meter readings.

A.2.3 test track should be a clean, dry, straight road, its length is generally less than 200m. Runway surface should not be made

As excessive tire noise.

A.2.4 When measured, the ambient temperature should be -5 ~ 35 °C, measuring 1.2m above the ground at the site from wind speed is not more than 5m/s. When the wind

When the speed is greater than 3m/s, to avoid the effects of wind noise, the microphone should be tops in the hood, but the hood should not affect the accuracy of the measurement.

Measuring instrument meteorological parameters should be placed in the vicinity of the measurement site and a height of 1.2m.

A.2.5 background noise measurements should be at least lower than the noise measurement of 10dB (A), the measurement should guarantee not to be incidental to other sound source

interference.

GB 19757 2005

A.3 acceleration measured with vehicle noise

A.3.1 measuring site is arranged as shown in Figure 1. On the measuring site marked the runway centerline CC, center M, acceleration starting line

AA, the acceleration of the line BB, instrument placement points P1 and P2. Acceleration section length is 2 × (10 ± 0.05) m.

A.3.2 instrument placed at the points P1 and P2, respectively, with a fixed tripod sound level meter, sound level meter microphone placed in P1, P2 point,

1.2m ± 0.05m from the ground and toward the line CC, and the horizontal axis line CC microphone distance is 7.5m ± 0.05m, and perpendicular to the CC

Line and parallel to the ground.

A.3.3 when accelerating by measuring the area, measured three cars or low-speed vehicles should be straight, three cars or low-speed vehicles measured longitudinally

The amount of deviation from the center line plane of the CC should be controlled within ± 0.3m, otherwise the measurement is invalid.

Figure 1 measurement field and the measurement zone and microphone arrangement

A.3.4 should be measured using a sound level meter "A" frequency weighting characteristics and "F" time weighting characteristics.

A.3.5 tested three cars or low-speed vehicles at the following gear. forward block number is 4 more than three cars or low-speed vehicles linked to third

Block, the number of forward gears is four or less three-wheeled cars or low-speed vehicles linked to second gear. The article does not include the use of forward gears deputy

Number of gear shifting mechanism when there subtransmission of three cars or low-speed vehicles will be measured the subtransmission mechanism disposed transport gear position.

Tested three cars or low-speed vehicles to the predetermined gear and steady speed (3/4 rated speed equivalent to the speed of the engine when),

Along CC line accelerating towards the start line AA, which vehicle speed changes should be controlled within ± 2km/h; if the engine speed control, the speed change

Technology should be controlled within ± 4%.

When the front end of the measured three cars or low-speed trucks arrived AA line shall promptly stepped on the accelerator pedal as much as possible in the end (ie throttle

Fully open) and kept to test three cars back-end or low-speed vehicles to leave the BB line after the pedal is released (ie, throttle closed), read and write

Recorded three cars or low-speed vehicles through the survey area of maximum sound level meter reading.

A.3.6 If the measured three cars or low-speed vehicles to accelerate with the AA between BB line, the engine speed does not reach the rated speed,

Should the distance AA line to M points to 15m, re-measurement.

GB 19757 2005

A.3.7 Measurement in three cars or low-speed vehicles on each side at least four times. If 4 consecutive measurements on the same side of no greater than 2dB

(A), the measurement result is considered effective, otherwise it should be re-measured.

A.4 measurement results and reports

The measured values recorded in Appendix B. Calculation of three cars or low-speed vehicles on each side of the four arithmetic average of the measured value, whichever is

The maximum noise level on both sides of the average three cars or low-speed vehicles in a larger value of the measured three cars or low-speed vehicles with vehicle acceleration.

The maximum noise level shall be rounded to the relevant provisions of one decimal place.

Three cars or low-speed vehicles accelerated with the maximum vehicle noise does not exceed the limits specified in Table 1, for the test pass.

GB 19757 2005

Appendix B

(Informative)

Three cars, low-speed trucks traveling the vehicle acceleration noise meter register

Test Date Test Location Pavement Condition

Weather Wind m/s Ambient temperature °C

Three cars or low-speed vehicles. Model Type cab forward range number

No trial date of serial number

Engine. Model Rated power kW Rated speed r/min

Sound Level Meter. Model Accuracy class Verification Effective Date

Acoustic Calibrator. Model Accuracy class Verification Effective Date

When calibrating sound level meter reading. before measuring dB (A) after measurement dB (A)

Speed (rpm) Instrument. Model Accuracy Verification Effective Date

Thermometer. Model Accuracy Verification Effective Date

Anemometer. Model Accuracy Verification Effective Date

Background noise. Before measurement dB (A) after the measurement dB (A)

Gear selection

Measuring the position of the right side of the left

Number of measurements 12341234

Speed / (km/h)

Or engine speed/(r/min)

Start Line

Stop Line

Noise measurement dB (A)

The average value of each side dB (A)

The average of both sides is greater dB (A)

Three cars, low-speed vehicle acceleration with the maximum vehicle noise level dB (A)

Surveyors drivers

other instructions

END: Draft Version (GB 19757-2005)