BS EN ISO 3743-2-2009 声学.声压法测定噪声源的声功率级.混响声场中小声源和移动声源的工程测量方法.特殊混响试验间用方法

标准号：BS EN ISO 3743-2-2009
中文标准名称：声学.声压法测定噪声源的声功率级.混响声场中小声源和移动声源的工程测量方法.特殊混响试验间用方法
英文标准名称：Acoustics - Determination of sound power levels of noise sources using sound pressure - Engineering methods for small, movable sources in reverberant fields - Methods for special reverberation test rooms
标准类型：Z32
发布日期：2010/5/31 12:00:00
实施日期：2010/5/31 12:00:00
中国标准分类号：Z32
国际标准分类号：17.140.01
适用范围：This part of ISO 3743 specifies a relatively simple engineering method for determing the sound power levels of small,movable noise sources.The measurements are carried out when the source is installed in a specially designed room having a specified reverberation time over the frequency range of iterest.The A-weighted sound power level of the source under test is determined from a single A-weighted sound pressure level measurement at each microphone position,rather than from a summation of octave-band levels.This direct method eliminates the need for a reference sound source,but requires the use of a special reverberation test room.The direct method is based on the premise that the sound pressure level,averaged in space and time in the test room,can be used to determine the sound power level emitted by the source.The properties of the special reverberation test room are chosen so that the room's influence on the sound power output of the equipment under test is small.The number of microphone positions and source locations required in the test room are specified.Guidelines for the design of special reverberation rooms are given in annex B.