Acoustic intensity analysis: Distinguishing energy propagation and wave‐front propagation
作者:
J. Adin Mann,
Jiri Tichy,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1991)
卷期:
Volume 90,
issue 1
页码: 20-25
ISSN:0001-4966
年代: 1991
DOI:10.1121/1.401290
出版商: Acoustical Society of America
关键词: WAVE PROPAGATION;SOUND LEVELS;ENERGY TRANSFER;SOUND FIELDS;WAVE FRONT
数据来源: AIP
摘要:
Three arguments are presented to demonstrate the distinction between energy propagation and wave‐front propagation in an acoustic field where the reactive intensity is nonzero. This distinction is especially useful for understanding the acoustic near field. Physical interpretations of the active and reactive intensity vectors and their contributions to the energy propagation described by the instantaneous intensity are summarized. Also, two differential equations are developed that show the interdependence of the active and reactive intensity vectors. Other important results show the contribution of the reactive intensity to the wave fronts propagating at speeds other than the speed of sound, and also show that energy associated with the reactive intensity does propagate to the far field.
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