ChinaAutoRegs｜GB/T 20787-2023英文版翻译《往复式内燃机 结构噪声测量方法》

Reciprocating Internal Combustion Engines—Measurement Method for Structure-Borne Noise

Foreword I

Introduction II

1 Scope 1

2 Normative References 1

3 Terms and Definitions 1

4 Measurement Environment 3

5 Measuring Instruments 3

6 Installation and Operation Conditions 3

7 Acceleration Measurement 4

8 Calculation 9

9 Information to be Recorded 10

10 Report 10

Annex A (Normative) Other connections between the engine and the test surroundings 11

Annex B (Normative) Corrections to the height of sensor contact plane 12

Annex C (Normative) Determination of the test frequency range 13

Annex D (Informative) Measurement Record 16

Bibliography 17

1 SCOPE

This document specifies the measurement method for structure-borne noise of reciprocating internal combustion engines.

This document is applicable to the reciprocating internal combustion (hereinafter referred to as “engine”, unless otherwise specified) defined in GB/T 21404.

2 NORMATIVE REFERENCES

The following normative documents contain provisions which, through normative reference in this text, constitute essential provision of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendment) applies.

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 6072.1 Reciprocating internal combustion engines – Performance – Part 1: Declarations of power, fuel and lubricating oil consumptions, and test methods – Additional requirements for engines for general use

GB/T 6072.3 Reciprocating internal combustion engines – Performance – Part 3: Test measurements

GB/T 13824 Mechanical vibration of rotating and reciprocating machinery—Requirements for instruments for measuring vibration severity

GB/T 14777 Geometrical orientation and directions of movements

3 TERMS AND DEFINITIONS

For the purpose of this document, the terms and definitions given in GB/T 6072.1, GB/T 13824, and GB/T 14777, as well as the following apply.

3.1 structure-borne noise

vibration transmitted through solid structures in the frequency range of audible sound

Note: For the purpose of this document, the structure-borne noise refers to the vibration transmitted at the engine feet.

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