The acoustic quantity measurement of target source in a noisy environment has always been one of the hotspots in the research field of acoustics,and the sound field separation is the key technology to solve it.For a superposi-tion sound field of one plate source and one sphere source,a sound field separation method based on complex acoustic radiation modes(ARMs)is proposed in this paper.Firstly,ARMs and corresponding basis vectors of the target plate source and the interference sphere source are calculated,and then the independent contribution of each order acoustic basis vector is calculated with the measurement of sound pressure,and the basis vectors are rear-ranged and truncated.Finally,the target sound field is obtained by solving the separation coefficient.Numerical simulations verify that the separation error is less than 0.01‰ when there is no environmental white noise and is be-low 10％with the white noise level SNR=25 dB.In addition,the influencing factors such as sound pressure ratio between sources,white noise level,the number of selected orders,the number of measuring points and the shape of the measuring surface are analyzed.
关键词
声场分离/声辐射复模态/基向量/重排截断/阶次选择
Key words
sound field separation/complex acoustic radiation mode/basis vector/rearrangement and trun-cation/order selection
万方数据