GB/T 25078.1-2010Acoustics -- Recommended practice for the design of low-noise machinery and equipment -- Part 1: Planning (English PDF)

Foreword

GB/T 25078 Acoustics - Recommended practice for the design of low-noise machinery

and equipment consists of 2 parts:

-- Part 1: planning;

-- Part 2: Introduction to the physics of low noise design.

This Part is Part 1 of GB/T 25078. This Part is identical to ISO/TR 11688-1:1995,

Acoustics - Recommended practice for the design of low-noise machinery and

equipment - Part 1: Planning (English version).

For ease of use, this Part makes editorial modifications to ISO/TR 11688-1:1995, and

adds newer references such as the "Noise and Vibration Control Engineering Handbook"

edited by Ma Dayou published in 2002 to the Bibliography.

Annex A and Annex B of this Part are normative.

Annex C of this Part is informative.

This Part is proposed by the Chinese Academy of Sciences.

This Part shall be under the jurisdiction of National Technical Committee on Acoustics

of Standardization Administration of China (SAC/TC 17).

Drafting organizations of this Part: Institute of Acoustics, Nanjing University, Institute

of Acoustics, Chinese Academy of Sciences, Institute of Acoustics, Tongji University,

Northwestern Polytechnical University, Changsha Aobang Environmental Protection

Industry Co., Ltd.

Main drafters of this Part: Qiu Xiaojun, Tian Jing, Cheng Mingkun, Yu Wuzhou, Mao

Dongxing, Chen Ke'an, Mo Jianyan.

Acoustics - Recommended practice for the design of low-

noise machinery and equipment - Part 1: Planning

1 Scope

This Part of GB/T 25078 is an aid to understanding the basic concepts of noise control

in machinery and equipment.

The recommended practice presented here is intended to assist the designer at any

design stage to control the noise of the final product. Methodical development of

products was chosen as a basis for the structure of this document (see Clause 4).

The list of design rules given in this Part is not exhaustive. Other technical measures

for reducing noise at the design stage may be used if their efficacy is identical or higher.

To solve problems beyond the scope of this Part, the designer can refer to the

bibliography in this Part, which presents the general state of acoustic handbooks at the

time of publication. Furthermore, reference is made to the numerous technical

publications dealing with acoustical problems.

2 Normative references

The terms in the following documents become the terms of this Part by reference to this

Part of GB/T 25078. For dated references, all subsequent amendments (not including

errata content) or revisions do not apply to this Part. However, parties to agreements

that are based on this Part are encouraged to study whether the latest versions of these

documents can be used. For undated references, the latest edition applies to this Part.

GB/T 3767-1996, Acoustics - Determination of Sound Power Levels of Noise

Sources Using Sound Pressure - Engineering Method in an Essentially Free Field

over a Reflecting Plane (eqv ISO 3744:1994)

GB/T 3768-1996, Acoustics - Determination of sound power levels of noise sources

using sound pressure - Survey method using an enveloping measurement surface

over a reflecting plane (eqv ISO 3746:1995)

GB/T 14574-2000, Acoustics - Declaration and verification of noise emission values

of machinery and equipment (eqv ISO 4871:1996)

GB/T 16404-1996, Acoustics - Determination of sound power levels of noise sources

using sound intensity - Part 1: Measurement at discrete points (eqv ISO 9614-1:1993)

c) The dominant structure-borne noise transmission paths were those between the

pump and motor and pump and reservoir;

d) The dominant radiating surfaces were those of the electric motor and the reservoir.

The hydraulic pump used in this example is not typical of the equipment currently

available. Replacing the hydraulic pump with one having less structure-borne and

liquid-borne source strengths would have reduced the overall sound power level.