GB/T 14097-2023 PDF in English
GB/T 14097-2023 (GB/T14097-2023, GBT 14097-2023, GBT14097-2023)
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| GB/T 14097-2023 | English | 170 |
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Reciprocating internal combustion engines - Limit values of emitted noise
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| GB/T 14097-2018 | English | 70 |
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Reciprocating internal combustion engines -- Limit values of emitted noise
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| GB 14097-1999 | English | 199 |
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[GB/T 14097-1999] Noise limits for small and medium power diesel engines
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| GB 14097-1993 | English | RFQ |
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Noise limits for small and medium power diesel engines
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Standards related to (historical): GB/T 14097-2023
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GB/T 14097-2023: PDF in English (GBT 14097-2023) GB/T 14097-2023
GB
NATIONAL STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
ICS 27.020
CCS J 91
Replacing GB/T 14097-2018
Reciprocating internal combustion engines - Limit values of
emitted noise
ISSUED ON: SEPTEMBER 7, 2023
IMPLEMENTED ON: APRIL 1, 2024
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Measurement methods ... 6
4.1 General ... 6
4.2 Acoustic treatment of specific sound sources ... 7
4.3 Operating conditions ... 7
5 Noise limits ... 8
5.1 Calculation of sound power level limits ... 8
5.2 Noise grade assessment ... 9
6 Determination method ... 9
7 Marking ... 9
Appendix A (Informative) An example of engine noise grade assessment ... 10
Foreword
This document was drafted in accordance with the provisions of GB/T 1.1-2020
Directives for standardization - Part 1: Rules for the structure and drafting of
standardizing documents.
This document replaces GB/T 14097-2018 Reciprocating internal combustion engines
- Limit values of emitted noise. Compared with GB/T 14097-2018, in addition to
structural adjustments and editorial changes, the main technical changes are as follows:
a) Some definitions in "Terms and definitions" are modified and the term "engine
noise grade 5" is added (see Chapter 3; see Chapter 3 of the 2018 edition);
b) The chapter "Acoustic treatment of specific sound sources" is modified (see
4.2; see 4.2 of the 2018 edition);
c) The content of "Operating conditions" is modified (see 4.3; see 4.3 of the 2018
edition);
d) The chapter "Noise limits" is modified (see Chapter 5; see Chapter 5 of the
2018 edition);
e) The chapter "Marking" is modified (see Chapter 7; see Chapter 7 of the 2018
edition).
Please note that some of the contents of this document may involve patents. The issuing
organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Machinery Industry Federation.
This document is under the jurisdiction of the National Technical Committee on Internal
Combustion Engines of Standardization Administration of China (SAC/TC177).
Drafting organizations of this document: Shanghai Internal Combustion Engine
Research Institute Co., Ltd., Commercial Vehicle Technology Center of SAIC Motor
Corporation Limited, Shanghai Motor Vehicle Inspection Certification & Tech
Innovation Center Co., Ltd., Wuxi Diesel Engine Works of FAW Jiefang Automobile
Co., Ltd., Shanghai New Power Automobile Technology Co., Ltd., Guangxi Yuchai
Machinery Co., Ltd., Kunming Yunnei Power Co., Ltd., Weichai Power Co., Ltd., U
Power (Shanghai) Automotive Technology Co., Ltd., Yiyi Internet Technology Co., Ltd.,
SAIC Motor Corporation Limited, Tianjin Internal Combustion Engine Research
Institute (Tianjin Motorcycle Technology Center), Pan Asia Technical Automotive
Center Co., Ltd., Tongji University, Weifang Internal Combustion Engine Quality
Inspection Center Co., Ltd., Hunan Liyu Gas Power Co., Ltd.
Reciprocating internal combustion engines - Limit values of
emitted noise
1 Scope
This document specifies the five grades of sound power level limits of noise for
reciprocating internal combustion engines.
This document applies to reciprocating internal combustion engines defined in GB/T
21404 (hereinafter referred to as "engines" unless otherwise specified).
2 Normative references
The contents of the following documents constitute the essential clauses of this
document through normative references in this text. Among them, for referenced
documents with dates, only the versions corresponding to the dates are applicable to
this document; for referenced documents without dates, the latest versions (including
all amendments) are applicable to this document.
GB/T 1859.1 Reciprocating internal combustion engines - Measurement of sound
power level using sound pressure - Part 1: Engineering method
GB/T 1859.3 Reciprocating internal combustion engines - Measurement of sound
power level using sound pressure - Part 3: Precision methods for hemi-anechoic
rooms
GB/T 8170 Rules of rounding off for numerical values & expression and judgment
of limiting values
GB/T 21404 Internal combustion engines - Determination and method for the
measurement of engine power - General requirements
3 Terms and definitions
The terms and definitions defined in GB/T 1859.1, GB/T 1859.3, and GB/T 21404 and
the following terms and definitions apply to this document.
3.1 engine noise grade
Classification based on engine noise level.
3.2 engine noise grade 1; ENG1
An engine whose measured sound power level values under all operating conditions are
less than or equal to its corresponding Level 1 sound power level limit.
3.3 engine noise grade 2; ENG2
An engine whose measured sound power level values in all operating conditions are
less than or equal to its corresponding Level 2 sound power level limit, and whose
measured sound power level value in at least one operating condition is greater than its
corresponding Level 1 sound power level limit.
3.4 engine noise grade 3; ENG3
An engine whose measured sound power level values in all operating conditions are
less than or equal to its corresponding Level 3 sound power level limit, and whose
measured sound power level value in at least one operating condition is greater than its
corresponding Level 2 sound power level limit.
3.5 engine noise grade 4; ENG4
An engine whose measured sound power level values in all operating conditions are
less than or equal to its corresponding Level 4 sound power level limit, and whose
measured sound power level value in at least one operating condition is greater than its
corresponding Level 3 sound power level limit.
3.6 engine noise grade 5; ENG5
An engine whose measured sound power level value in at least one operating condition
is greater than its corresponding Level 4 sound power level limit.
4 Measurement methods
4.1 General
Engine noise measurement shall preferably be carried out in accordance with the
provisions of GB/T 1859.3, and may also be carried out in accordance with the
provisions of GB/T 1859.1.
NOTE: The measurement uncertainty specified in GB/T 1859.3 is smaller than that in GB/T 1859.1, but
the working conditions and operating conditions of the engine are exactly the same.
When measuring noise, the engine operating conditions shall comply with the
provisions of GB/T 1859.3 (or GB/T 1859.1). Fixed-speed engines and marine engines
shall operate at rated conditions; other engines shall operate at full load speed
characteristics (i.e. external characteristics).
When operating under external characteristic conditions, steady-state measurement is
preferred, and dynamic measurement of speed increase/deceleration can also be
performed, and the operating conditions shall include rated speed operating conditions
and minimum operating speed conditions. The speed interval of the operating condition
is counted starting from the rated speed; the minimum operating speed condition is
usually determined by the external characteristic curve provided by the manufacturer.
For gasoline engines and diesel engines with a rated speed greater than 3000 r/min, the
determined minimum operating speed shall be less than or equal to 1000 r/min. When
measuring under steady state, the speed interval is selected according to the number
system of 400 r/min, 200 r/min, 100 r/min, 50 r/min, and 25 r/min, and the number of
operating conditions is at least 8; when measuring under dynamic speed
increase/deceleration, the speed interval is 25 r/min, and the speed change rate shall be
less than or equal to 75 r • min-1/s.
5 Noise limits
5.1 Calculation of sound power level limits
The A-weighted sound power level limit (LWGN) of engines of various noise grades shall
be calculated according to formula (1), accurate to 0.1, in decibels (dB):
where:
Pr -- ISO standard power (rated power), in kilowatts (kW) (reference value: Pr0=1 kW);
nr -- Corresponding speed (rated speed) under ISO standard power, in revolutions per
minute (r/min) (reference value: nr0=1 r/min);
n -- Rotating speed, in revolutions per minute (r/min) (reference value: n0=1 r/min);
N -- The ordinal number of the noise grade (Grade 1: N = 1; Grade 2: N = 2; Grade 3:
N = 3; Grade 4: N = 4).
The indices α, β, and γ and the constant C are selected according to Table 1.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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