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An impedance-based formulation of frequency-domain nonlinearity indicators in finite-amplitude sound propagation.
- Source :
-
Journal of the Acoustical Society of America . Sep2020, Vol. 148 Issue 3, pEL295-EL300. 6p. - Publication Year :
- 2020
-
Abstract
- Since the Morfey-Howell Q/S was introduced as a single-point frequency-domain nonlinearity indicator for propagation of intense broadband noise [AIAA J. 19, 986–992 (1981)], there has been debate about its validity, utility, and interpretation. In this Letter, the generalized Burgers equation is recast in terms of specific acoustic impedance along with linear absorption and dispersion coefficients, normalized quadspectral density (Q/S), and newly proposed normalized cospectral density (C/S). The formulation leads to a rather straightforward interpretation in which Q/S and C/S, respectively, represent the additional absorption and dispersion at a locale, produced by the passage of a finite-amplitude wave. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ACOUSTIC wave propagation
*ACOUSTIC impedance
*ABSORPTION coefficients
Subjects
Details
- Language :
- English
- ISSN :
- 00014966
- Volume :
- 148
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Journal of the Acoustical Society of America
- Publication Type :
- Academic Journal
- Accession number :
- 146194835
- Full Text :
- https://doi.org/10.1121/10.0002030