摘要
针对管道中的声源测量问题,提出了一种双端口多负载法。方法不需要使用外加声源,通过改变管道末端的声学负载来改变管道中的声场,从而得到声源的辐射特性和传递特性。利用双端口多负载法测量了空气管道中轴流风扇的声学特性,与传统外加声源法测量结果符合较好。双端口多负载法可以应用在待测声源很强而导致外加声源法无法实施的情况。
Abstract：A multi-load method for determining the source data of acoustic two-port sources is presented. By eliminating the term of source strength, the scattering matrix can then be obtained by solving a set of nonlinear algebraic equations, and the source strength is determined by the scattering matrix and the directly measured spectrum matrix corresponding to one of the acoustic loads. The method has been tested on an axial flow fan in a duct. The source data obtained by this method show reasonable agreement with that measured by the direct method. The multi-load method avoids using external sources, and it can be used as an alternative method when the external source is not easy to realize in practice.
出处
《科学技术与工程》
北大核心
2013年第20期5761-5765,5780,共6页
Science Technology and Engineering
基金
声学所前瞻项目(Y154211121)资助
关键词
双端口
负载
测量
声学
Two-port system multi-load measurement acoustics
