Nonlinear effects on tonal sound in lined ducts
Porous sound absorbers are a familiar and supposedly well-understood feature of the noise control palette. As in many other aspects of engineering, however, aerospace applications require a degree of mastery well beyond the common place: sound absorbers must be designed to be effective at high noise levels within strict mass and volume constraints. In the process of fine-tuning sound absorbers for jet aircraft, it was discovered that high incident sound pressure levels cause the performance of lined ducts to diverge from small-signal predictions. The underlying physics was not fully understood prior to the early 1980s, at which point NASA-sponsored research disclosed and quantified the primary mechanism. Further research by others continues building on that foundation down to the present. This paper gives a brief overview of the topic, summarizes one of the research efforts, and adapts its findings for lined duct applications.
- Record URL:
- Find a library where document is available. Order URL: http://worldcat.org/issn/1475472X
- © 2016 David A. Nelson.
- Nelson, David A
- Publication Date: 2016-7
- Media Type: Web
- Features: References;
- Pagination: pp 462-473
- TRT Terms: Acoustics; Aircraft; Ducts; Jet engines; Noise; Noise sources; Porous materials; Sound absorption
- Subject Areas: Aviation; Vehicles and Equipment;
- Accession Number: 01722644
- Record Type: Publication
- Files: TRIS
- Created Date: May 24 2019 5:00PM