Industrial fans — Determination of fan sound power levels under standardized laboratory conditions — Part 3: Enveloping surface methods
工业风扇——标准化实验室条件下风扇声功率级的测定第3部分:包络面法
发布日期:
2004-08-17
ISO 13347-3:2004适用于ISO 5801和ISO 13349中定义的工业风扇。它仅限于确定指定设置的空气声发射。未测量振动,也未确定空气声发射对振动影响的灵敏度。
可根据ISO 13347-3:2004进行试验的风机尺寸仅受试验装置实际方面的限制。尺寸限制、测试风扇尺寸和空气性能将控制测试风扇的房间大小、功率和安装要求。
ISO 13347-3:2004中的试验安排确定了成功试验所需的实验室条件。现场几乎不可能满足这些要求,ISO 13347-3:2004不适用于现场测量。提醒有意使用的用户,在这些情况下,如果风扇的入口和出口条件不理想,可能会产生额外的声学系统效果。
包络面法可用于确定标准安装类型的风机的开式入口和/或开式出口声功率级。
对于使用ISO 5136中所述的管道内方法进行测试时太小或不方便的风机,其管道声功率的估算(不确定性增加)也可以通过添加端部反射校正来获得。
ISO 13347-3:2004 applies to industrial fans as defined in ISO 5801 and ISO 13349. 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.
The sizes of fan which can be tested in accordance with ISO 13347-3:2004 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.
The test arrangements in ISO 13347-3:2004 establish the laboratory conditions necessary for a successful test. Rarely will it be possible to meet these requirements in situ and ISO 13347-3:2004 is not intended for field measurements. Intending users are reminded that, in these situations, there may well be additional acoustic system effects where inlet and outlet conditions at the fan are less than ideal.
The enveloping surface methods may be used for the determination of open inlet and/or open outlet sound power level of fans for standardized installation types.
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 may also be obtained by the addition of end reflection corrections.