声学.风机和其他鼓风装置吹到管道中的声功率的测定.管道法

BS EN ISO 5136-2009

声学.风机和其他鼓风装置吹到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

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适用范围：This International Standard specifies a method for testing ducted fans and other air-moving devices todetermine the sound power radiated into an anechoically terminated duct on the inlet and/or outlet side of theequipment.The method is applicable to fans which emit steady, broad-band, narrow-band and discrete-frequency soundand to air temperatures between − 50 °C and + 70 °C. The test duct diameter range is from 0,15 m to 2 m.Test methods for small (d < 0,15 m) and large (d > 2 m) test ducts are described in the informative Annexes Hand I, respectively.The maximum mean flow velocity at the microphone head for which the method is suitable depends on thetype 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) maybe insufficient.It is expected that sound power tests will be conducted in conjunction with airflow performance tests inaccordance with ISO 5801. The ducting arrangement will therefore normally incorporate a “star” type flowstraightener on the outlet side of the fan which will minimize swirl (see 7.3). Where it is permissible to deletethe straightener as, for example, with large fans to installation category C according to ISO 5801:1997, themethod is limited to a swirl angle of 15°. (An example of a method for determining the angle of swirl is given inAnnex J.)

实施日期： 2010-04-30

ICS分类号： 17.140.20,23.120 - 计量学和测量、物理现象

标准组织： BS - 英国标准学会标准

全文来源： WF

英文关键词： Acoustic measurement Acoustic testing Acoustics Definitions Determination Duct methods Ducted fans Fans Loudness levels Measurement Measuring results Measuring techniques Noise (environmental) Noise measurements Power levels Sound Sound intensity Sound level Sound levels Sound power Testing Ventilators Volume (sound)

语种：汉语

页数： 80

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声学.风机和其他鼓风装置吹到管道中的声功率的测定.管道法

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