Nonlinear acoustics of water‐saturated marine sediments

Continued Investigation of the Acoustics of Marine Sediments Using Impedance Tube and Acoustic Resonator Techniques

The main goal of this project is to increase our understanding of sound propagation in ocean bottom sediments, including ocean bottom multiphase material such as gas-bearing sediments and seagrass, which in turn benefits buried object detection, sonar operation and acoustic communications in shallow water. Another goal for the out years is to develop the proposed research apparatus into an oper...

Investigation of the Acoustics of Marine Sediments Using an Impedance Tube

The primary objective is to obtain experimental measurements of the plane wave reflection coefficients from laboratory and in situ sediments using impedance tube [1] and acoustic resonator tube [2, 3] methods, in the frequency range of approximately 300 Hz to tens of kHz. This approach will also yield measurements of the acoustic impedance, sediment sound speed, attenuation, and complex density...

Nonlinear Underwater Acoustics

Chapter 2. Methods of calculation of Nonlinear interactions in sound beams Small parameters used in the calculation of wave interactions Solution of the equations of hydrodynamics by the method of successive approximations Calculation of the secondary field by the Green's function method: The Westervelt formula Estimates of the basic characteristics of parametric radiators by means of nomograms...

Nonlinear acoustics and honeycomb materials

The scope of research activity that Bruce Thompson embraced was very large. In this talk three different research topics that the author shared with Bruce are reviewed. They represent Bruce’s introduction to NDE and include nonlinear acoustics, nondestructive measurements of adhesive bond strengths in honeycomb panels, and studies of flexural wave dispersion in honeycomb materials. In the first...

Marine Sediments and Climate History