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A physical insight of the active control on sound source in a pipe

机译：管道中声源主动控制的物理见解

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This paper is mainly intended to discuss the physical understanding of active control on the primary source in a pipe. The derivation of some acoustic fields involved, the measurement of the sound source impedance in either an active or non-active control situation by using a Helmholtz resonator, and the comparison between two results as obtained are included in this study. In order to demonstrate the feasibility of the measurement of source impedance using the Helmholtz resonator technique, this study also compares the acoustic power as obtained for a sound source in a semi-infinite pipe with that measured at the anechoic termination by means of a sound intensity method. The results as obtained by using the above two methods agree reasonably well.
机译：本文的主要目的是讨论对管道中主要源的主动控制的物理理解。本研究包括涉及的某些声场的推导，使用亥姆霍兹谐振器在主动或非主动控制情况下测量声源阻抗，以及获得的两个结果之间的比较。为了证明使用亥姆霍兹共振器技术测量源阻抗的可行性，本研究还比较了在半无限管道中为声源获得的声功率与通过声强在消声终端处测量的声功率。方法。通过使用上述两种方法获得的结果相当吻合。

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