GB/T 33928-2017Reciprocating internal combustion engines -- Measurement method for silencers -- Sound power level of exhaust noise and insertion loss using exhaust sound pressure and power loss ratio (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard uses the translation method identical with ISO 15619.2013 "reciprocating internal combustion engine exhaust muffler method of sound pressure exhaust

Noise power level and insertion loss and power loss ratio "(in English).

The documents of our country that are consistent with the corresponding international documents that are normative references in this standard are as follows.

--- GB/T 3241-2010 Electroacoustics Octave and Fractional Octave Filters (IEC 61260.1995, MOD)

This standard is proposed by the China Machinery Industry Federation.

This standard by the National Internal Combustion Engine Standardization Technical Committee (SAC/TC177) centralized.

This standard was drafted by Shanghai Internal Combustion Engine Research Institute, Shanghai Automotive Group Co., Ltd. Commercial Vehicle Technology Center, Jiangsu Emei power

Machinery Co., Ltd., Guangxi Yuchai Machinery Co., Ltd., View-car Co., Ltd., Hangzhou Silver Wheel Technology Co., Ltd., Tongji University, Zhejiang

Jiang University, Tianjin Internal Combustion Engine Research Institute, Shanghai Automotive Group Co., Ltd. car technology center.

1 Scope

This standard specifies the reciprocating internal combustion engine exhaust muffler with the measurement methods and requirements, including laboratory measurement methods and field measurements

method.

Laboratory (Engineering) measured the amount of.

--- Sound pressure method of exhaust noise sound power level (A weight or band), the accuracy level of 2;

--- Exhaust muffler insertion loss (A weight or band);

Reciprocating internal combustion engine power loss ratio.

The field and laboratory (simple method) determination of the amount of.

--- Sound pressure measurement of exhaust noise sound power level (A weighted), accuracy rating of 3;

--- Exhaust muffler insertion loss (A weighted).

Note 1. The laboratory-determined exhaust noise sound power level is intended to obtain measurements of Level 2 accuracy classes (Engineering Methods) such as background noise correction and/or the environment

Conditions and/or exhaust port position can not meet the requirements of this standard engineering law, you get 3 levels of accuracy (simple method) of the measurement results; the standard site

The measured exhaust noise sound power level is obtained only by the level 3 accuracy level (simple method) measurement results.

This standard laboratory (engineering method) measurement methods can be used for acceptance testing, but also for the development of engineering measures; site and laboratory (simplified method)

Measurement methods can be used for comparative tests.

This standard applies to equipped with GB/T 6072.1-2008 applicable range reciprocating internal combustion engine exhaust muffler, and there is no suitable standard

Other exhaust mufflers may be used.

Note 2. The following text unless otherwise specified, the exhaust muffler referred to as muffler, Reciprocating internal combustion engine referred to as the engine.