This standard specifies the noise type, measurement method and noise limit of gasoline engine products with power below 30kW. This standard applies to the noise limit allowed for small gasoline engines. GB 15739-1995 Noise Limit for Small Gasoline Engines GB15739-1995 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Noise limitation of small gasoline engine
Noise limitation of small gasoline engine1 Subject content and scope of application
GB 15739-1995
Replaces GIm264-86
This standard specifies the noise type, measurement method and noise limit of gasoline engine products with a power of less than 30kW. This standard applies to the noise limit allowed for small gasoline engines. 2 Referenced standards
GB1859 Measurement of sound power level of noise of internal combustion engines Standard engineering method GB1105.11105.3 Test method for bench performance of internal combustion engines 3 Noise type of small gasoline engine
The noise type of small gasoline engines shall be specified by the manufacturer according to their matching purposes and use environment. The same model can be suitable for different noise types due to the use of different noise reduction measures, such as different intake and exhaust mufflers. 3.1 Low noise type
Gasoline engines used in generator sets and indoor environments. 3.2 High noise type
Gasoline engines with a speed greater than 7000 r/min, with personal noise protection conditions or used for field operations. 3.3—General type
All gasoline engines except those specified in 3.1 and 3.2 are of this type. 4 Measurement methodbZxz.net
4.1 The required measurement quantity, acoustic test environment, test instrument, gasoline engine installation and noise measurement conditions and measurement calculation method in this standard shall comply with the provisions of GB1859.
4.2 When measuring the noise of a small gasoline engine, all accessories in normal use should be installed. Whether the noise generated by the main accessories is included in the noise of the whole machine shall be handled according to Table 1.
General purpose machine
Automotive machine
Not including
Intake noise
Fan noise
Not including
Reducer transmission noise
Sound insulation
Note: When measuring noise, the exhaust muffler and air filter used in conjunction with the product should generally be installed, including
4.3 The measurement surface S of the sound pressure level is an imaginary rectangular pentahedron without the bottom surface. The number of measuring points is 9 and the positions of the measuring points are in accordance with the provisions of GB1859.
Approved by the State Administration of Technical Supervision on November 16, 1995 366
Implemented on May 1, 1996
GB15739
4.4 When measuring the noise of a gasoline engine, it should operate stably under the conditions of the rated speed and rated power. The accuracy of its speed and power should comply with the provisions of GB1105.3. The operating conditions of the gasoline engine should be stated in the test report. 4.5 The identification of the test environment shall be based on the standard sound source method, and the environmental correction value K2 is usually ≤3dB. 4.6 When measuring the noise value of a small gasoline engine, except for the provisions of this standard, all other relevant provisions shall be carried out in accordance with GB1859. 5 Noise limits for small gasoline engines
5.1 Air-cooled gasoline engines
The noise sound power level limits for air-cooled gasoline engines shall be as specified in Table 2. Table 2
Gasoline engine type
Low noise type
High noise type
Two-stroke
Four-stroke
Two-stroke
Four-stroke
Two-stroke
Four-stroke
>3～6kW
5.2 The noise sound power level limit of water-cooled gasoline engine shall not exceed 110dB(A). Additional remarks:
This standard is proposed by the Ministry of Machinery Industry of the People's Republic of China. This standard is drafted by the Tianjin Internal Combustion Engine Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are Zhao Shen and Jiang Yuhong. >6～10 kW
>10~15 k
6 "Noise Limits for General Small Gasoline Engines" shall be invalid. From the date of implementation of this standard, the original standard GBn264-86>15～30 kW
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