风机 标准化实验室条件下风机声功率级的测定 包络面法

[中文适用范围]： 1 适用范围 本文件规定了一种测定风机声功率级的方法，适用于符合 ISO 13349-1 定义的风机。本文件仅适用于规定测试配置下 airborne（空气传播）声发射的测定，不涉及振动测量，亦不评估 airborne 声发射对振动效应的敏感性。 依据本文件进行测试的风机尺寸仅受测试配置实际条件的限制；风机的尺寸、测试用风机的几何参数及空气性能将决定测试房间的尺寸、功率需求及安装要求。 注：小型风机可根据实际用途选择按本文件或 ISO 10302-1 进行测试。 本文件所规定的测试布置旨在确立实验室条件下成功测试所需的必要环境。在实地（原位）测试中，通常难以完全满足这些要求，因此本文件不适用于现场测量。 注：请 intending users（预期用户）注意，在此类情况下，风机进、出口条件非理想时，可能产生额外的声学系统效应。 [外文原描述]： This document specifies a method for determining the sound power level of a fan. This document is applicable to fans as defined in ISO 13349-1. The applicability of this document is limited to the determination of airborne sound emission for the specified set-ups. Vibration is not measured, nor is the sensitivity of airborne sound emission to vibration effects determined. The sizes of fan which can be tested in accordance with this document are limited only by the practical aspects of the test set-up. Dimensional limitations, test fan dimensions, and air performance will control the room size, power and mounting requirements for the test fan. NOTE Small fans can be tested according to this document or to ISO 10302-1, according to usage. The test arrangements in this document establish the laboratory conditions necessary for a successful test. Rarely will it be possible to meet these requirements in situ and this document is not intended for field measurements. NOTE Intending users are reminded that, in these situations, there can be additional acoustic system effects where inlet and outlet conditions at the fan are less than ideal. The enveloping surface methods can be used for the determination of open inlet and/or open outlet sound power level of fans for the standardized installation categories given in 4.1 . An estimation (with increased uncertainty) of ducted sound power for fans too small, or otherwise inconvenient, for testing by the in-duct method described in ISO 5136 can also be obtained by the addition of end reflection corrections (see ISO 13347-1:2025, Annex C).