Acoustics--Tractors and machinery for agriculture and forestry--Measurement of noise at the operators position-Survey method
Some standard content:
GE/T 16955—1997
This standard is equivalent to the international standard ISO5131:1996 "Simplified method for measuring the noise at the operator's position of acoustic agricultural and forestry tractors and machinery". This will make my country's measurement method for measuring the noise at the operator's position of agricultural and forestry tractors and machinery consistent with the international standards, which is conducive to international trade, technology and economic exchanges.
The writing format and expression method of this standard are in accordance with the provisions of GH/1.1-1993. The foreword of ISO5131:1996 is retained in the form of title \TSC Foreword\, and the foreword of this standard is added. "Appendices A, BC and D of this standard are all standard appendices, and Appendix E of this standard is a suggestive appendix
This standard is proposed and coordinated by the National Technical Committee for Acoustic Standardization. The drafting unit of this standard is China Agricultural Mechanization Science Research Institute. The main initiators of this standard are Zhang Weisheng and Chen Junbao. This standard is entrusted to China Agricultural Mechanization Science Research Institute for interpretation. GB/T169551997
ISO Foreword
ISO (International Organization for Standardization) is a joint organization of national standards bodies (ISO member bodies) in the world. The formulation of international standards is usually carried out by ISO's technical committees. Each member body interested in the project of an established technical committee has the right to participate in the committee. ISO liaison members' international organizations, governmental and non-governmental Organizations may also participate in the work. ISO and the International Electrotechnical Commission (IEC) collaborate closely in all areas of electrical standardization. Draft International Standards adopted by the technical committees are circulated to their member bodies for voting. Publication as an International Standard requires at least 75% of the member bodies voting in favor.
International Standard ISO 5131 was prepared by Technical Committee ISU/TC:48 Acoustics, Subcommittee SC1 Noise, and Technical Committee ISU/TC23 Forestry Tractors and Machinery, Subcommittee SC3 Operator Safety and Comfort. This second edition of this standard replaces the first edition (ISO 5131:1982) by technical revision and the first edition is abolished. Annexes A, B, C and D of this International Standard are normative annexes. Annex E of this International Standard is an informative annex. 1 Scope
National Standard of the People's Republic of China
Acoustics Agricultural and forestry tractors and machinery
Simplified method for measuring noise at the operator's position Acoustics-Tractors and mahlnery for agricultureand forestry-Measurement of nolse al the operator'sposltlon-Survey method
GB/T16955—1997
eqv Iso 5131:1996
This standard specifies the method for measuring the noise at the operator's position of agricultural and forestry tractors and machinery. This standard applies to tractors and machinery that are operated by the operator sitting or walking, and the noise measured is only related to the machine itself. The test procedures specified in this standard are the same as the test procedures of the simplified method in GB/T14259. This standard also specifies the basic requirements for measuring and recording the noise at the operator's position of agricultural and forestry tractors and machinery. The following appendices specify additional conditions for the noise measurement of various types of machinery: Appendix A (Standard Appendix) Agricultural and forestry tractors Appendix B (Standard Appendix) White walk-behind agricultural machinery Appendix C (Standard Appendix) Walk-behind agricultural machinery Appendix D (Standard Appendix) Forestry forwarders and logging tractors During the measurement, the specified machine operating conditions should make the measured noise true and reproducible and the maximum noise that the operator can be exposed to when operating the machine. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. The versions shown are valid at the time of publication of this standard. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB3241-82 1/1 and 1/3 octave filters for sound and vibration analysis GH3785-83 Electrical and acoustic properties and test methods of sound level meters GB/T14259-93 Acoustics Guide to standards for the measurement of airborne noise and the evaluation of its impact on humans GB/T 15173-94 Sound calibrator
JB/T6715-93 Agricultural tractor driver's seat landmark 3 Measurement requirements
3.1 All readings of the sound level meter should be read under the slow weighting characteristic. 3-2 The measured quantity should be A-weighted sound pressure level in d. 3.3 Spectral analysis is an optional test item. If required, the measured load should be the octave band sound pressure level in dB. 4 Measurement equipment
4.1 The sound level meter used shall at least comply with the requirements for Type 2 sound level meters in GB3785-83. Approved by the State Administration of Technical Supervision in 1997-0 B-27. Implementation on March 1, 1998
GB/T16955-1997
4.2 If other measuring equipment is used, the errors of the various parts of the measuring system shall not exceed the errors specified in the corresponding clauses of GB3785. 4.3 The sound spectrum shall be measured using a frequency analyser equipped with a 1/2-octave filter. The 1/2-octave filter shall comply with the requirements for Class 1 filters in GB3241.
Note 1 It should be noted that, especially when using a 13 mm straight transducer, if the sound is directional, in order to ensure that no error is caused by the characteristics of the microphone, a random-radiation adapter shall be used if necessary to ensure that its omnidirectionality is not worse than that of the Type 2 sound level meter specified in GB3785-88. The multi-dimensional nature of the sound in the cab usually avoids errors caused by the directional characteristics of the microphone. 4.4 During measurement, the instrument shall be calibrated in accordance with all the requirements specified in (G133785). The instrument shall be checked regularly, and at least immediately before and after the measurement, it shall be checked with an acoustic calibrator that meets the requirements of GB/T15173-91 for a Class 1 calibrator. The acoustic calibrator shall be checked and verified annually, and its initial calibration shall be performed by the municipal national metrology verification and certification department. 5 Acoustic environment, meteorological conditions, background noise 5.1 The test site shall be flat and open. There shall be no obstacles that reflect sound, such as buildings, walls, trees or other vehicles, within a test site at least 20m away from the test machine. When using a power load vehicle or a recording vehicle, it shall be parked far enough away to avoid reflections. 5.2: The temperature shall be - 5~-30C. The wind speed at the operator's position shall not exceed 5m/s, and other meteorological conditions shall not affect the measurement. 5.3 The background noise level and the A-weighted sound pressure level of wind-borne noise during the test period shall be at least 10dB lower than the measured noise level. If spectrum analysis is required, the background noise level in each frequency band during the test shall be at least 10dB lower than the measured noise level in the corresponding frequency band. 5.4 During the test, except for the operator of the tractor or machinery, other personnel shall not be in the operating position or in the cab. When measuring the noise at other operator positions of the machinery, the number of operators shall be determined according to the number of people usually required. Except for the operator, other personnel shall not be in a position that affects the noise measurement.
6 Condition of the tractor or machinery
The tractor or machinery shall comply with the manufacturer's product technical specifications and be operated according to the manufacturer's instructions. Before taking measurements, the engine, transmission system and hydraulic system shall be properly operated to stabilize their temperatures. The specific conditions of various types of machinery specified in this standard are given in Appendix A to Appendix D. 7 Operator
For walking-operated machinery and machinery operated by the operator standing, an operator with a height of 1.72m! .1I should be selected. The operator shall not wear any clothes, hats or headscarves during measurement. 8 Position of the microphone
8.1·For seated operators, the microphone shall be placed 250mm to one side of the center plane. The sound pressure level on this side should be higher, the sensor axis should be horizontal and the diaphragm should face forward. The center of the microphone should be 700mm ± 20mm above the driver's seat mark. 100mm + 20mm in front of the front plate: vibration reduction measures should be taken to avoid excessive vibration of the sensor. The driver's seat mark is determined according to the provisions of JB/T6715. 8.2 For standing and walking operators, the microphone should be fixed on an open-frame helmet on the operator's head or shoulder strap, the sensor axis should be horizontal, the diaphragm should be 250mm ± 20mm on one side of the center plane of the operator's head, at the same height and in front of the operator's head, and the microphone should be placed on the side of the operator's head with higher sound pressure level. During the noise measurement.The operator should always face forward. 9 Noise measurement procedure
At least 3 measurements shall be made in each operating state at each position specified in Chapter &, with a time interval of not less than 5. Under certain measurement conditions, if the measured A-weighted sound pressure level results differ by more than 3 dB, the measurement shall be continued until the difference between the readings of 3 consecutive measurements is within d3 minutes. The arithmetic average of the 3 readings shall be taken as the test result. The tractor or machine shall be measured for noise level line by line according to the provisions of the corresponding appendix. The measurement report shall clearly indicate that the sound level meter is A-frequency weighting and slow gear time weighting. The measurement shall be made after 105 days of stable operation. Due to the large fluctuation range of the sound pressure level of the machine type characteristics, if the requirement of no more than 3 dB difference in consecutive readings specified above cannot be met, the number of interval measurements shall be greater than the fluctuation range, and the arithmetic average shall be taken as the test result. In all cases, any peak value that is significantly different from the general sound level shall be removed. The value given in the report shall be the integer part of the result measured according to the above procedure (rounded off according to the rounding rules). Note 2 If the manufacturer requires, in addition to the A-weighted sound pressure level, the octave band sound pressure level with a center frequency in the range of 31.5Hs to 8000Hz may also be measured and recorded.
10 Test report
The test report shall include the following:
a) Indication that the test was carried out in accordance with this standard;
b) Test report number and test date:
c) Complete identification of all necessary information for the tractor or machine;
d) Complete identification of all necessary information for the cab (if any);
e) Test location!
t) The condition and type of the tested tractor or machine,) The test instrument,
h) The engine speed suitable for the test conditions; The forward speed of the tractor or the forward speed of the machine The measurement results measured according to the corresponding appendix;
i) In addition to the above, the test report should also include the details of the test operator and the working position; i) The test management organization.
The format of the test report recording the test results is shown in Appendix E (Indicative Appendix) A1 General
GB/T16955-1997
Appendix A
(Subjective Appendix)
Agricultural and forestry tractors
During the measurement, the tractor should not be used for agricultural or forestry operations. During the test, it is best to load the tractor with the traction load generated by the power load vehicle.
A2 Tractor running state
During the measurement, tractors equipped with pneumatic tires should be operated on dry concrete or asphalt ground with a horizontal inclination angle of no more than 2°. There should be no sand, leaves and accumulation on the ground. Crawler tractors and metal wheel tractors should be operated on flat grass or solid ground without tall weeds and plants. The test road should have at least 150m long straight section to allow the tractor speed to stabilize and sufficient time for measurement. The tractor should not be equipped with counterweight. Wheeled tractors should be equipped with conventional agricultural pneumatic wheels, and the wear should not exceed 50%. Before the noise measurement, the power output shaft power test or other methods are used to determine the tractor's average power. The deviation between the value and the rated power given by the manufacturer should be within 5%.
A3 Cab and accessories
A3.1 If a cab is installed, the sound positive level should be measured with all openings, doors and windows, large windows and windshield closed. In addition, if the openings must be operated in the open state and no danger will occur during the normal use of the tractor, the noise can be measured when they are all open, but the windshield should be kept closed. Note 3 The results of the measurement when the doors, windows and sunroof are open are provided for information only, so that users can know what sound pressure levels under certain working conditions can cause tooth injury and what working conditions exceed the sound pressure levels measured in the closed driving air. During the measurement, the components that ensure the normal operation of the engine (such as the engine cooling fan) should be running at the same time, but the engine-powered or self-driven auxiliary equipment (such as: window wipers, heating system and ventilation fans, power output shaft) should be stopped. 43.2 The additional noise when the engine is running at the highest speed and all auxiliary air conditioning equipment are working can be measured. The heating system or ventilation fan shall be operated at maximum load.
43.3 The additional noise of all auxiliary equipment, such as ventilation fans, dehumidifiers and other electrical equipment, can be measured when the engine is stopped. The energy supplied to the auxiliary equipment should be at least the normal output energy value. A4 Noise Measurement
A4.1 General requirements
Noise measurements should be made under the following conditions: a) without traction load
b) with traction load.
During the measurement, the wheel slip should not exceed 15%, and the track slip should not exceed 7. For tractors with four-wheel drive (4WD), the sound pressure level should be measured in both four-wheel drive and two-wheel drive (2WD) states (front drive shaft engaged or disengaged). The higher of the two recorded measurement values is taken as the measurement result. 44.2 Measurement method when no load
The microphone should be placed on the side with the larger predetermined operator sound level. When determining, the tractor is running without load at the rated engine speed specified by the manufacturer, with a forward speed as close to 7.5 km/h as possible. GB/T 16955—1997
The tractor shall be measured at the rated engine speed specified by the manufacturer, with a forward speed as close to 7.5 km/h as possible.
When measuring, the throttle control handle shall be placed in the full open position or the governor control handle shall be placed in the maximum engine speed position. The stable noise level measured during the operation of the tractor shall be recorded, and a multiple frequency band analysis shall be performed at the same time (optional). A4.3 Measurement method with load
44.3.1 The microphone shall be placed on the side with the larger predetermined operator sound pressure level. When determining, the tractor shall be running with the throttle control handle under load in the full open position or the governor control handle in the maximum engine speed position, with a forward speed as close to 7.5 km/h as possible. 44.3.2 Measure the A-weighted sound pressure level when the tractor is running at the rated engine speed specified by the manufacturer and in a gear or state with a forward speed as close to 7.5 km/h as possible, and perform octave band analysis (optional). Note: The forward speed of 7.5 km/h specified in A4.2 and A4.3 is recommended to be adjusted to 6 km/h for belt tractors. The tractor governor control handle is placed in the full open position. After starting without load, gradually increase the load until the maximum sound pressure level is obtained. After each load increase, a period of time should be allowed for the noise level to stabilize before measuring. The load state should keep the engine running under governor control.
A4.3.3 Use the same procedure to measure the noise in all other gears or states, and only record the measured sound pressure level that is more than 1 dB greater than the measured value in A4.3.2, and perform octave band analysis (optional). For tractors with continuously variable transmission, noise measurements shall be made at four speeds evenly distributed within the speed range of 4 km/h to 16 ki/h. A4.3.4 The noise of the tractor running at the maximum design speed without load shall also be measured and recorded. A5 Test report
The test report shall comply with the provisions of Chapter 10 and shall include the results of the measurements in accordance with Chapter 9 and A1. Appendix B
(Standard Appendix)
Self-propelled agricultural machinery
B1 Operation status of machinery
The machinery shall be fixed on a short grass or on the ground that meets the acoustic requirements of Chapter 5 for noise measurement. The engine of the machinery shall be operated at the manufacturer's rated speed. All mechanisms shall be operated under typical continuous working conditions, but no crops or other materials shall pass through the machinery. All devices (box hoppers) used to store crops or other materials shall be empty. The microphone shall be placed on the side with a higher sound bed level of the operator. Note 5 Available data indicate that the noise level measured when the combine harvester is stationary but its service parts are running is significantly different from the noise level when it is operating. B2 Cab and accessories
2.1 If a cab is installed, the sound pressure level should be measured with all openings, doors, windows, skylights, and windshields closed. In addition, if the openings must be operated in the open state and will not cause danger during normal use of the tractor, the noise when they are all open can be measured, but the windshield should be kept closed at this time. Note 6 The results of the measurement when the doors, windows, and skylights are open are provided only as information to enable the user to know what working conditions The sound pressure level can cause injury and what working conditions The sound pressure level exceeds the maximum value measured in a closed cab. B2.2 The additional noise when the engine is running at the highest speed and all auxiliary air conditioning equipment is working can be measured. The heating system or ventilation fan should be operated at maximum load.
B2.3 The additional noise of all auxiliary equipment, such as ventilation hoods, defrosters and other electrical equipment, operating at maximum load when the engine is stopped can be measured. During the measurement, the energy supplied to the auxiliary equipment should be at least the normal output energy value. B3 Operational sound measurement A-weighted sound pressure level and octave band sound pressure level (optional) should be measured and recorded under the above-mentioned operating conditions. 4 Test report The test report should comply with the provisions of Chapter 10 and should include the results of the measurements in accordance with Chapter 9 and B3. Appendix C (Standard Appendix) Walk-behind agricultural machinery C1 Operating state of the machinery The machinery should be fixed on a short grass field or ground that meets the acoustic requirements of Chapter 5 for noise measurement. The engine of the machinery should be operated at the rated speed of manufacture, and all mechanisms should be operated under typical field operation conditions, but the tillage or moving parts should not contact the soil or crops.
The microphone should be placed on the side where the sound pressure level is higher for the operator. Note: The provisions of this appendix do not apply to equipment that is carried by the operator for operation. C2 Noise measurement
A-weighted sound pressure level and times the belt sound pressure level (optional) shall be measured and recorded under the same operating conditions as specified above. C3 Test report
The test report shall comply with the provisions of Chapter 10 and shall include the results of the measurements in accordance with Chapters 9 and 2. Appendix D
(Standardized Appendix)
Forestry forwarders and logging tractors
D1.1 Forwarder: A self-propelled machine capable of transporting timber completely off the ground, usually self-loading. 11.2 Logger tractor: A self-propelled machine that transports timber by towing. D2 Operation of machinery
During the measurement, machinery equipped with pneumatic tires should operate on a dry concrete or clear ground with a horizontal inclination of not more than 10.2. There should be no sand, leaves, snow, etc. on the ground. Tracked or metal wheeled machinery should operate on flat grass or solid ground with high weeds and plants. The test runway or route should have a line section of at least 150m in length so that the machine speed can be stabilized and there is enough time for measurement. The machine should be without counterweight and without load. Wheeled machines should be equipped with conventional pneumatic wheels, and the wear should not exceed 50. Before the noise measurement, the power of the machine should be determined by the power output shaft power test or other methods. The difference between its value and the rated power given by the manufacturer should be within 5%. D3 Cab and accessories GB/T16955-1997 D3.1 This test procedure is applicable to machines with and without cabs. If a cab is installed, the sound pressure level should be measured when all openings, doors, windows, skylights, and windshields are closed. In addition, if the openings must be operated in the open state and will not cause danger during normal use of the tractor, the noise when they are all open can be measured, but the windshield should remain closed at this time. Note 8 The results of the measurements with the doors, windows and sunroof open are provided as information to let the user know under what operating conditions the sound pressure level can cause harm and under what operating conditions the sound pressure level exceeds the measured value for closed driving. During the measurement, the components that ensure the normal operation of the engine (such as the engine cooling brushes) should be running at the same time, but the engine-powered or self-driven auxiliary equipment (such as the window wipers, heating system and ventilation fans, power output shaft) should be stopped. 13.2 The additional noise when the engine is running at the highest speed and all auxiliary air conditioning equipment is working can be measured. The heating system or ventilation fan should be running at maximum load.
D3-3 The additional noise when the engine is stopped and the ventilation fan, defroster and other electrical equipment are running at maximum load can be measured. When measuring, it should be ensured that the energy supplied to the auxiliary equipment is at least the normal output energy value. D4 Noise measurement
The microphone should be placed on the side with higher voice of the operator. A-weighted sound pressure level and octave band sound pressure level (optional) should be measured and recorded under the following operating conditions: a) The governor control handle is in the full open position, the machine is loaded and moving forward in the highest gear, b) The governor control handle is in the full open position, the machine is unloaded and moving forward at the gear with the forward speed as close to 4km/h as possible at the manufacturer's rated engine speed. Note 9 When measuring the octave band sound pressure level (optional), it is recommended that the machine be operated in the state that can produce the highest sound pressure level. D5 Test Report
The test report shall comply with the provisions of Chapter 10 and shall include the results measured in accordance with Chapter 9 and D4. Noise test according to GB/T16955-1997 Test Report No.
Machine Overview Description:
1) Manufacturing!
2) Model,
3) Rated power output rail and corresponding reverse 1) Maximum no-load speed of the engine
5) Type of transmission system
6) Type of seat
7) Specification of wheel eye or track:
Rear
8) Number of driving wheels
Specification of cab or protective device
a) Overview
CB/T16955—1997
Appendix E
(Tyre's Appendix)
Format of test report
Test date
b) Description of acoustic treatment materials used in protective structures: 1) Internal filling materials
Front panel
Rear panel
Instrument panel and bogie
(upper part)
2) Wind shield
3) Glass
4) Other electrical equipment
Materials and specifications
Materials and specifications
Materials and specifications
Materials and specifications
Materials and specifications
Materials and specifications
(Model and thickness)
(Brand and plastic number)
Test parts
a) Test location
h Test ground,
) Test pseudo
1) Sound level signal
2) Microphone
3) Octave filter
4) Tape recorder
5) Sound calibration instrument
6) Octave analyzer
GB/T16955--1997
According to the test results of the corresponding appendix (an example of Appendix A is given) Position!
State!
Clause number
2nd gear
8th gear, etc.
Octave cheek strap sound pressure level
Position!
State!
Clause number
Operator
Height, m
Working position
Basic observations
Testing unit
Tester
Traction
Running speed
Cab closed
A-yield sound pressure level, dB
Cab open
Level, B
Center frequency, Hz
Approving person
(position)2 Timber tractor 8kidder: A self-propelled machine that transports wood by hauling. During the measurement, the machine with pneumatic tires should be operated on a dry concrete or green ground with a horizontal inclination angle of less than 10.2. There should be no sand, leaves, snow, etc. on the ground. Tracked or metal wheeled machines should be operated on a flat grass or a solid ground with tall weeds and plants. The test runway or route should have a self-tracking section of at least 150m long so that the machine speed can be stabilized and there is enough time for measurement. The machine should be without counterweight and without load. The wheeled machine should be equipped with conventional pneumatic wheels, and the wear should not exceed 50. Before the noise measurement, the power of the machine should be determined by the power output shaft power test or other methods. The value should be within 5% of the nominal power given by the manufacturer. D3 Cab and Accessories
GB/T16955—1997
D3.1 This test procedure is applicable to machines with and without cab. If a cab is installed, the sound pressure level should be measured when all openings, doors, windows, skylights and windshields are closed. In addition, if the openings must be operated in the open state and no danger will be caused during normal use of the tractor, the noise when they are all open can be measured, but the windshield should be kept closed at this time. Note 8 The results measured when the doors, windows and skylights are open are provided as information to enable the user to know under what working conditions the sound pressure level can cause harm and under what working conditions the sound pressure level exceeds the measurement value for the closed cab. During the measurement, the components that ensure the normal operation of the engine (such as engine cooling brushes) should be running at the same time, but the engine-powered or self-driven auxiliary equipment (such as window wipers, heating system and ventilation fans, power output shaft) should stop running.13.2 The additional noise when the engine is running at the highest speed and all auxiliary air-conditioning equipment is working can be measured. The heating system or ventilation fan should be running at the maximum load.
D3-3 The additional noise when the engine is stopped and the ventilation fan, defroster and other electrical equipment are running at the maximum load can be measured. During the measurement, it should be ensured that the energy supplied to the auxiliary equipment is at least the normal output energy value. D4 Noise measurement
The microphone should be placed on the side with a higher vocal cord of the operator. A-weighted sound pressure level and octave band sound pressure level (optional) should be measured and recorded under the following operating conditions: a) The governor control handle is in the full open position, the machine is loaded and moving forward in the highest gear, b) The governor control handle is in the full open position, the machine is unloaded and moving forward at the gear with the forward speed as close to 4km/h as possible at the manufacturer's rated engine speed. Note 9 When measuring the octave band sound pressure level (optional), it is recommended that the machine be operated in the state that can produce the highest sound pressure level. D5 Test Report
The test report shall comply with the provisions of Chapter 10 and shall include the results measured in accordance with Chapter 9 and D4. Noise test according to GB/T16955-1997 Test Report No.
Machine Overview Description:
1) Manufacturing!
2) Model,
3) Rated power output rail and corresponding reverse 1) Maximum no-load speed of the engine
5) Type of transmission system
6) Type of seat
7) Specification of wheel eye or track:
Rear
8) Number of driving wheels
Specification of cab or protective device
a) Overview
CB/T16955—1997
Appendix E
(Tyre's Appendix)
Format of test report
Test date
b) Description of acoustic treatment materials used in protective structures: 1) Internal filling materials
Front panel
Rear panel
Instrument panel and bogie
(upper part)
2) Wind shield
3) Glass
4) Other electrical equipment
Materials and specifications
Materials and specifications
Materials and specifications
Materials and specifications
Materials and specifications
Materials and specifications
(Model and thickness)
(Brand and plastic number)
Test parts
a) Test location
h Test ground,
) Test pseudo
1) Sound level signal
2) Microphone
3) Octave filter
4) Tape recorder
5) Sound calibration instrument
6) Octave analyzer
GB/T16955--1997
According to the test results of the corresponding appendix (an example of Appendix A is given) Position!
State!
Clause number
2nd gear
8th gear, etc.
Octave cheek strap sound pressure level
Position!
State!
Clause number
Operator
Height, m
Working position
Basic observations
Testing unit
Tester
Traction
Running speed
Cab closed
A-yield sound pressure level, dB
Cab open
Level, B
Center frequency, Hz
Approving person
(position)2 Timber tractor 8kidder: A self-propelled machine that transports wood by hauling. During the measurement, the machine with pneumatic tires should be operated on a dry concrete or green ground with a horizontal inclination angle of less than 10.2. There should be no sand, leaves, snow, etc. on the ground. Tracked or metal wheeled machines should be operated on a flat grass or a solid ground with tall weeds and plants. The test runway or route should have a self-tracking section of at least 150m long so that the machine speed can be stabilized and there is enough time for measurement. The machine should be without counterweight and without load. The wheeled machine should be equipped with conventional pneumatic wheels, and the wear should not exceed 50. Before the noise measurement, the power of the machine should be determined by the power output shaft power test or other methods. The value should be within 5% of the nominal power given by the manufacturer. D3 Cab and Accessories
GB/T16955—1997
D3.1 This test procedure is applicable to machines with and without cab. If a cab is installed, the sound pressure level should be measured when all openings, doors, windows, skylights and windshields are closed. In addition, if the openings must be operated in the open state and no danger will be caused during normal use of the tractor, the noise when they are all open can be measured, but the windshield should be kept closed at this time. Note 8 The results measured when the doors, windows and skylights are open are provided as information to enable the user to know under what working conditions the sound pressure level can cause harm and under what working conditions the sound pressure level exceeds the measurement value for the closed cab. During the measurement, the components that ensure the normal operation of the engine (such as engine cooling brushes) should be running at the same time, but the engine-powered or self-driven auxiliary equipment (such as window wipers, heating system and ventilation fans, power output shaft) should stop running.13.2 The additional noise when the engine is running at the highest speed and all auxiliary air-conditioning equipment is working can be measured. The heating system or ventilation fan should be running at the maximum load.
D3-3 The additional noise when the engine is stopped and the ventilation fan, defroster and other electrical equipment are running at the maximum load can be measured. During the measurement, it should be ensured that the energy supplied to the auxiliary equipment is at least the normal output energy value. D4 Noise measurement
The microphone should be placed on the side with higher vocal cords of the operator. A-weighted sound pressure level and octave band sound pressure level (optional) should be measured and recorded under the following operating conditions: a) The governor control handle is in the full open position, the machine is loaded and moving forward in the highest gear, b) The governor control handle is in the full open position, the machine is unloaded and moving forward at the gear with the forward speed as close to 4km/h as possible at the manufacturer's rated engine speed. Note 9 When measuring the octave band sound pressure level (optional), it is recommended that the machine be operated in the state that can produce the highest sound pressure level. D5 Test Report
The test report shall comply with the provisions of Chapter 10 and shall include the results measured in accordance with Chapter 9 and D4. Noise test according to GB/T16955-1997 Test Report No.
Machine Overview Description:
1) Manufacturing!
2) Model,
3) Rated power output rail and corresponding reverse 1) Maximum no-load speed of the engine
5) Type of transmission system
6) Type of seat
7) Specification of wheel eye or track:
Rear
8) Number of driving wheels
Specification of cab or protective device
a) Overview
CB/T16955—1997
Appendix E
(Tyre's Appendix)
Format of test report
Test date
b) Description of acoustic treatment materials used in protective structures: 1) Internal filling materials
Front panel
Rear panel
Instrument panel and bogie
(upper part)
2) Wind shield
3) Glass
4) Other electrical equipment
Materials and specifications
Materials and specifications
Materials and specifications
Materials and specifications
Materials and specifications
Materials and specifications
(Model and thickness)
(Brand and plastic number)
Test parts
a) Test location
h Test ground,
) Test pseudo
1) Sound level signal
2) Microphone
3) Octave filter
4) Tape recorder
5) Sound calibration instrument
6) Octave analyzer
GB/T16955--1997
According to the test results of the corresponding appendix (an example of Appendix A is given) Position!
State!
Clause number
2nd gear
8th gear, etc.
Octave cheek strap sound pressure level
Position!
State!
Clause number
Operator
Height, m
Working position
Basic observations
Testing unit
Tester
Traction
Running speed
Cab closed
A-yield sound pressure level, dB
Cab open
Level, B
Center frequency, Hz
Approving person
(position)2 The additional noise when the engine is running at the highest speed and all auxiliary air conditioning equipment is in operation can be measured. The heating system or ventilation fan should be operated at the maximum load.
D3-3 The additional noise when the engine is stopped and the ventilation fan, defroster and other electrical equipment are operating at the maximum load can be measured. When measuring, it should be ensured that the energy supplied to the auxiliary equipment is at least the normal output energy value. D4 Noise measurement
The microphone should be installed on the side with higher voice of the operator. The A-weighted sound pressure level and the octave band sound pressure level (optional) should be measured and recorded under the following operating conditions: a) The governor control handle is placed in the full open position and the machine is moving forward with no load and the highest gear, b) The governor control handle is placed in the full open position and the machine is moving forward with no load at the gear with the forward speed as close to 4km/h as possible at the manufacturer's rated engine speed. Note 9 When measuring the octave band sound pressure level (optional), it is recommended that the machine be operated under the condition that can produce the highest sound pressure level. D5 Test Report
The test report shall comply with the provisions of Chapter 10 and shall include the results of measurements in accordance with Chapter 9 and D4. Noise test in accordance with GB/T16955-1997 Test Report Number
Description of the machine:
1) Make!
2) Model,
3) Rated power of power output rail and corresponding reverse 1) Maximum no-load speed of the engine
5) Type of transmission system·
6) Type of seat
7) Specification of wheel eye or track:
Rear·
8) Number of driving wheels
Specification of cab or protective device
a) Overview
CB/T16955—1997
Appendix E
(Tyre's Appendix)
Format of test report
Test date
b) Description of acoustic treatment materials used in protective structures: 1) Internal filling materials
Front panel
Rear panel
Instrument panel and bogie
(upper part)
2) Wind shield
3) Glass
4) Other electrical equipment
Materials and specifications
Materials and specifications
Materials and specifications
Materials and specifications
Materials and specifications
Materials and specifications
(Model and thickness)
(Brand and plastic number)
Test parts
a) Test location
h Test ground,
) Test pseudo
1) Sound level signal
2) Microphone
3) Octave filter
4) Tape recorder
5) Sound calibration instrument
6) Octave analyzer
GB/T16955--1997
According to the test results of the corresponding appendix (an example of Appendix A is given) Position!
State!
Clause number
2nd gear
8th gear, etc.
Octave cheek strap sound pressure level
Position!
State!
Clause number
Operator
Height, m
Working position
Basic observations
Testing unit
Tester
Traction
Running speed
Cab closed
A-yield sound pressure level, dB
Cab open
Level, B
Center frequency, HzbzxZ.net
Approving person
(position)2 The additional noise when the engine is running at the highest speed and all auxiliary air conditioning equipment is in operation can be measured. The heating system or ventilation fan should be operated at the maximum load.
D3-3 The additional noise when the engine is stopped and the ventilation fan, defroster and other electrical equipment are operating at the maximum load can be measured. When measuring, it should be ensured that the energy supplied to the auxiliary equipment is at least the normal output energy value. D4 Noise measurement
The microphone should be installed on the side with higher voice of the operator. The A-weighted sound pressure level and the octave band sound pressure level (optional) should be measured and recorded under the following operating conditions: a) The governor control handle is placed in the full open position and the machine is moving forward with no load and the highest gear, b) The governor control handle is placed in the full open position and the machine is moving forward with no load at the gear with the forward speed as close to 4km/h as possible at the manufacturer's rated engine speed. Note 9 When measuring the octave band sound pressure level (optional), it is recommended that the machine be operated under the condition that can produce the highest sound pressure level. D5 Test Report
The test report shall comply with the provisions of Chapter 10 and shall include the results of measurements in accordance with Chapter 9 and D4. Noise test in accordance with GB/T16955-1997 Test Report Number
Description of the machine:
1) Make!
2) Model,
3) Rated power of power output rail and corresponding reverse 1) Maximum no-load speed of the engine
5) Type of transmission system·
6) Type of seat
7) Specification of wheel eye or track:
Rear·
8) Number of driving wheels
Specification of cab or protective device
a) Overview
CB/T16955—1997
Appendix E
(Tyre's Appendix)
Format of test report
Test date
b) Description of acoustic treatment materials used in protective structures: 1) Internal filling materials
Front panel
Rear panel
Instrument panel and bogie
(upper part)
2) Wind shield
3) Glass
4) Other electrical equipment
Materials and specifications
Materials and specifications
Materials and specifications
Materials and specifications
Materials and specifications
Materials and specifications
(Model and thickness)
(Brand and plastic number)
Test parts
a) Test location
h Test ground,
) Test pseudo
1) Sound level signal
2) Microphone
3) Octave filter
4) Tape recorder
5) Sound calibration instrument
6) Octave analyzer
GB/T16955--1997
According to the test results of the corresponding appendix (an example of Appendix A is given) Position!
State!
Clause number
2nd gear
8th gear, etc.
Octave cheek strap sound pressure level
Position!
State!
Clause number
Operator
Height, m
Working position
Basic observations
Testing unit
Tester
Traction
Running speed
Cab closed
A-yield sound pressure level, dB
Cab open
Level, B
Center frequency, Hz
Approving person
(position)
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