DIN EN ISO 11691-2010 声学.无流量管道中消音器的插入损耗测量.实验室鉴定法(ISO 11691-1995).德文版本EN ISO 11691-2009
Acoustics - Measurement of insertion loss of ducted silencers without flow - Laboratory survey method (ISO 11691:1995); German version EN ISO 11691:2009
The document specifies a method for the simplified determination of the insertion loss of duct silencers intended for use with flows with velocities of 15 m/s or less. It is applicable for silencers with circular cross sections and diameters between 80 mm and 2000 mm and for silencers with rectangular cross-sectional areas in the same order of magnitude.