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	Duct spinning mode's particle velocity imaging with in-duct circular microphone array
	Wei, Qingkai ; Chen, Bao ; Huang, Xun
	2014
英文摘要	Nowadays, the measurements within a duct have to be conducted using in-duct microphone array, which is unable to provide information of complete acoustic solutions across the test section. In this work, an imaging method of acoustic spinning modes propagating within a circular duct simply with surface pressure informa- tion is introduced. The proposed method is developed in a theoretical way and is demonstrated by a numerical simulation case. The fundamental idea behind the testing method was originally developed in control theory for ordinary differential equations. Spinning mode propagation, however, is formulated in partial differential equations. A finite difference technique is used to reduce the associated partial differential equations to a clas- sical form in control theory. The observer method can thereafter be applied straightforwardly. The algorithm is recursive and thus could be operated in real-time. The observer error of the method is analyzed then. A numerical simulation for a straight circular duct is conducted. The acoustic solutions on the test section can be reconstructed with a good agreement to analytical solutions. The results suggest the potential and applications of the proposed method.; EI; 0
语种	英语
内容类型	会议论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/329917]
专题	工学院
推荐引用方式 GB/T 7714	Wei, Qingkai,Chen, Bao,Huang, Xun. Duct spinning mode's particle velocity imaging with in-duct circular microphone array[C]. 见:.

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