ISO 8579-1:2002 ギアユニットの受け入れコード—パート1：空中音のテストコード | ページ 2

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.

The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this part of ISO 8579 may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 8579-1 was prepared by Technical Committee ISO/TC 60, Gears.

This second edition cancels and replaces the first edition (ISO 8579-1:1993), which has been technically revised.

ISO 8579 consists of the following parts, under the general title Acceptance code for gear units:

• Part 1: Test code for airborne sound
• Part 2: Determination of mechanical vibrations of gear units during acceptance testing

Annexes A, B and C of this part of ISO 8579 are for information only.

Introduction

The sound emitted by a gear unit or gearmotor can be radiated by the casing of the gear unit, the driving system (e.g. motor, coupling, another gear unit), and the connected structures included in the gear-drive system.

On-site and on the shop test stand, the perceived sound can be significantly increased by reverberation effects or by the radiation of extraneous sources.

Depending on the type of gear unit or gearmotor, as well as on the requirement of the purchaser, it may be necessary for the manufacturer or supplier to know

• a) the sound emitted by the gear unit, excluding the sound from the driver/motor, driven system and transmission elements,
• b) the sound emitted by the gearmotor, including the motor and the transmission elements,
• c) the sound emitted by subsystems or auxiliaries, for example, the lubrication system, and
• d) the sound emitted by each of those elements in respect of a given requirement, or in view of an efficient sound-proofing of the installation.

This part of ISO 8759 describes methods for the determination of the sound emitted by a gear unit alone, a gearmotor or a gear-drive system. Sound emission is expressed in terms of the sound power level of the transmission system and the emission sound pressure level at the relevant work station (see 6.2).

Annex A provides examples of practical microphone positions on the measurement plane for different gear types and sizes. Annex B gives typical sound-pressure and sound power levels for different gear types and sizes. Annex C, developed for ISO 8579-1:1993, provides information on the determination of airborne sound power levels emitted by gear units, using a combination of the two methods given in clause 5.

1 Scope

This part of ISO 8579 specifies the instructions and standardized conditions necessary for the determination of the airborne sound emission of gear units and gearmotors. It also specifies the allowed measurement methods, together with the operating and mounting conditions used for the test.

The emission characteristics include emission sound pressure levels at specified positions and the sound power level. The determination of these quantities is necessary for

• a) manufacturers of gear units or gearmotors, in order that they may be able to declare the emitted sound,
• b) for comparing the sound emitted by gear units and gearmotors under service operation, and
• c) for the purpose of noise control at the design stage.

This part of ISO 8579 has the aim of ensuring, with its use, the reproducibility of the determination of the airborne sound emission characteristics within specified limits determined by the grade of accuracy of the basic measurement method used. The sound measurement methods allowed by this part of ISO 8579 are engineering methods (grade 2) and survey methods (grade 3).

2 Normative references

The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of ISO 8579. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of ISO 8579 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards.

3 Terms and definitions

For the purposes of this part of ISO 8579, the terms and definitions given in ISO 3743-1, ISO 3744, ISO 3745, ISO 3746, ISO 4871, ISO 9614-1, ISO 9614-2 and ISO 11203 apply.

Bibliography