Sources and observers in motion, I: Time variant analysis and its implications for aerodynamic sound
✍ Scribed by S.E. Wright
- Book ID
- 104154382
- Publisher
- Elsevier Science
- Year
- 1986
- Tongue
- English
- Weight
- 946 KB
- Volume
- 108
- Category
- Article
- ISSN
- 0022-460X
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✦ Synopsis
The observed radiation characteristics between acoustic sources and observers moving in rectilinear motion relative to a propagating medium is considered. The theory is an expanded form of that first given in reference . A local motion concept is used, the notion of time variant equations is introduced, and the mass displacement, rather than the mass flux, is used as the fundamental source description. Higher order sources, generated by bodies in motion, are considered as acoustic multipoles of fundamental sources. In this model the various time scales involved are emphasized, and attention is drawn to differences in the motional amplification between aerodynamic sources being applied directly to the propagating medium and those generated by moving bodies.