Nonlinear parameter estimation in water-saturated sandy sediment with difference frequency acoustic wave

• Published in: Ultrasonics Vol. 49; no. 4; pp. 438 - 445
• Main Authors: Kim, Byoung-Nam, Yoon, Suk Wang
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.05.2009; Elsevier
• Subjects: Acoustics; Difference frequency wave; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Mathematics; Nonlinear acoustics, macrosonics; Nonlinearity parameter; Parametric acoustic array; Physics; Seawater; Silicon Dioxide; Ultrasonics, quantum acoustics, and physical effects of sound; Water-saturated sandy sediment; Nonlinearity parameter; Difference frequency wave; 43.25.Ba; Parametric acoustic array; Water-saturated sandy sediment; Water; Parameter estimation; Acoustic wave; Sediments; Modeling; Ocean floors; Difference frequency; Granular material; Non linear acoustics; Acoustic arrays; System identification; Non linear effect; Parametric network; Non linear wave
• ISSN: 0041-624X; 1874-9968
• DOI: 10.1016/j.ultras.2008.11.002

Difference frequency acoustic wave from nonlinear interaction of two primary acoustic waves at frequencies of 76 and 114 kHz was utilized with a parametric acoustic array theory to estimate the nonlinearity parameter of water-saturated sandy sediment. Such nonlinearity parameter can be used as background information for the nonlinear acoustic investigation of bottom or sub-bottom profiling in the ocean sandy sediments. Because of its lower attenuation the difference frequency acoustic wave method can be usefully applied to estimate the nonlinearity parameter of ocean sediment in the ocean as well as under laboratory conditions. The nonlinearity parameter β for the water-saturated sandy sediment used as a reference in this study was estimated as β = 80.5 ± 5.1 at the difference frequency of 38 kHz. It was agreed very well with that estimated at the difference frequency of 67 kHz, when two primary frequencies were 137 and 204 kHz. The estimated nonlinearity parameter of water-saturated sandy sediment in this study was also compared and analyzed with those estimated in previously published literatures. It was suggested that the difference frequency wave method used to estimate the nonlinearity parameter of water-saturated sandy sediment can be employed as a good method to estimate the nonlinearity parameters of fluid-like granular media.