2m) test ducts are described in the informative Annexes H and I, respectively. The maximum mean flow velocity at the microphone head for which the method is suitable depends on the type of microphone shield used, and is as follows: — foam ball 15 m/s; — nose cone 20 m/s; — sampling tube 40 m/s. Above these values the suppression of turbulent pressure fluctuations by the microphone shield (see 3.9) may be insufficient. It is expected that sound power tests will be conducted in conjunction with airflow performance tests in accordance with ISO 5801. The ducting arrangement will therefore normally incorporate a "star" type flow straightener on the outlet side of the fan which will minimize swirl (see 7.3). Where it is permissible to delete the straightener as, for example, with large fans to installation category C according to ISO 5801:1997, the method is limited to a swirl angle of 15° (An example of a method for determining the angle of swirl is given in Annex J.) NOTE 2 The installation categories defined in ISO 5801 imply that the fan is either ducted on the outlet side only (category B), on the inlet side only (category C) or on both sides (category D). 2 Types of sound source The method described in this International Standard is applicable to a sound source in which a fan is connected to ducts on at least one side. It is also applicable to other fan/attenuator combinations or equipment incorporating fans which can be considered as "black boxes". Examples of fans and other equipment covered by this International Standard are — ducted centrifugal fans, — ducted axial flow fans, — ducted mixed-flow fans, — ducted air-handling units, — ducted dust-collection units, — ducted air-conditioning units, and — ducted furnaces. This International Standard is also applicable to other aerodynamic sources such as boxes, dampers and throttle devices provided that a quiet air flow delivered by an auxiliary fan is available, and the signal-to-noise ratio of sound pressures to turbulent pressure fluctuations in the test duct is at least 6 dB (see 7.2.1). An alternative method to determine the sound power level of the flow-generated noise of such aerodynamic sound sources, which does not require the measurement of sound pressure in a flow environment, is described in ISO 7235. The method was originally devised for the determination of the flow noise level of ducted silencers. The sound power is determined in a reverberation room connected to the test duct via a transition element. In the case of ducted fans with closely coupled attenuators, the signal-to-noise ratio of sound pressures to turbulent pressures may be insufficient when using the in-duct method. Therefore the method described in ISO 7235 is recommended for such fan/attenuator combinations. This International Standard is not applicable to non-ducted fans or equipment." >

ISO 5136:2003
声学.风机和其他风动设备辐射入管道中的声功率的测定.管道法

Acoustics - Determination of sound power radiated into a duct by fans and other air-moving devices - In-duct method


哪些标准引用了ISO 5136:2003

 

DIN EN ISO 5801:2018 风扇.利用标准化通风道进行性能试验(ISO 5801-2017);德文版本EN ISO 5801-2017BS EN ISO 5801:2017 工业风扇 标准通风道用性能试验ISO 5801:2017 通风机.用标准化风道进行性能测试BS EN 16475-2:2017 烟囱. 附件. 烟囱排风扇. 要求和试验方法BS EN 16583:2015 热交换器. 空调房间风机盘管. 声功率级的测定BS EN 13141-11:2015 建筑物通风. 住宅通风用部件/产品的性能试验. 进气通风装置ISO 13347-1:2004 工业风扇.标准化实验室条件下风扇声功率级的测定.第1部分:总揽
ISO 5136:2003
标准号
ISO 5136:2003
发布
2003年
中文版
GB/T 17697-2014 (等同采用的中文版本)
发布单位
国际标准化组织
当前最新
ISO 5136:2003
 
 
概述 本国际标准规定了一种测试管道风扇和其他空气输送装置的方法，以确定辐射到设备入口和/或出口侧消声端接管道中的声功率。 注 1：为简洁起见，文中凡出现“风扇”一词，均指“风扇或其他空气流动装置”。 该方法适用于发出稳定、宽带、窄带和离散频率声音的风扇，空气温度在- 50 ℃至+ 70 ℃之间。 测试管道直径范围为 0.15 m 至 2 m。 小型（d < ...

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谁引用了ISO 5136:2003 更多引用

DIN EN ISO 5801:2018 风扇.利用标准化通风道进行性能试验(ISO 5801-2017);德文版本EN ISO 5801-2017 BS EN ISO 5801:2017 工业风扇 标准通风道用性能试验 ISO 5801:2017 通风机.用标准化风道进行性能测试 BS EN 16475-2:2017 烟囱. 附件. 烟囱排风扇. 要求和试验方法 BS EN 16583:2015 热交换器. 空调房间风机盘管. 声功率级的测定 BS EN 13141-11:2015 建筑物通风. 住宅通风用部件/产品的性能试验. 进气通风装置 ISO 13347-1:2004 工业风扇.标准化实验室条件下风扇声功率级的测定.第1部分:总揽


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