风扇 在标准化实验室条件下确定风扇声功率等级 第2部分：混响室法

[中文适用范围]： 本文件规定了在标准化实验室条件下，通过在混响室中测量声压级来确定风机的声功率级。 本文件适用于确定风机的声学性能。本文件还可用于确定风机与附属装置（如屋顶罩或阻尼器）组合的声学性能，或在风机配备消声器时，确定风机和消声器组合产生的声功率级。关于使用附属项目的测试指南，参见附录C。 本文件适用于ISO 13349-1中定义的风机。它仅限于确定特定安装条件下的空气噪声排放。不测量振动，也不确定空气噪声排放对振动效应的敏感性。 本文件旨在与ISO 5136（涵盖管道内方法）和ISO 10302-1（适用于小型风机）结合使用。 可根据本文件测试的风机尺寸仅受测试装置实际方面的限制。测试风机的尺寸和空气性能将控制房间的大小。 注：根据使用情况，小型风机可根据本文件或ISO 10302-1进行测试。 对于混响场测试，被测设备的尺寸限制在小于房间体积的2%。 对于低功率风机（最高3kW），可使用家用电源（单相交流电，电压不超过250V，电流不超过16A）运行，参考IEC 60704-2-7[18]。 本文件中的测试装置建立了成功测试所需的实验室条件。在现场很难满足这些要求，因此本文件不适用于现场测量。在这些情况下，提醒用户，声学环境可能不符合规定的条件，并且在风机入口和出口条件不理想的情况下，可能会产生额外的声学系统效应。 [外文原描述]： This document specifies determining sound power levels of fans under standardized laboratory conditions from sound pressure levels measured in a reverberant room. This document is applicable for determination of the acoustic performance of fans. This document can additionally be applied to determine the acoustic performance of fans combined with an ancillary device, such as a roof cowl or damper or, where the fan is fitted with a silencer, the sound power resulting from the fan and silencer combination. For guidance of testing with ancillary items, see Annex C. This document applies to fans as defined in ISO 13349-1. It 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. This document is intended to be used in conjunction with ISO 5136, which covers the in-duct method, and ISO 10302-1 for small fans. The size of fans which can be tested in accordance with this document is limited only by the practical aspects of the test set-up. Test fan dimensions and air performance will control the room size. NOTE Based on usage, small fans can be tested according to this document or to ISO 10302-1. For reverberant field tests, the size of equipment under test is limited to less than 2 % of the room volume. For low power fans (up to 3 kW) that can be run from a domestic power supply (single phase AC at a voltage not exceeding 250 V and a current not exceeding 16 A), reference IEC 60704-2-7 [ 18]. The test arrangements in this document establish the laboratory conditions necessary for a successful test. It is difficult to meet these requirements in situ and this document is not intended for field measurements. In these situations, users are reminded that the acoustic environment is unlikely to meet the specified conditions and there can be additional acoustic system effects where inlet and outlet conditions at the fan are less than ideal.