PH 3451: Fundamental Acoustics. Instructor: Prof. Bruce Denardo, Department of Physics, NPS (Naval Postgraduate School). Development of, and solutions to, the acoustic wave equation in fluids; propagation of plane, spherical and cylindrical waves in fluids; sound pressure level, intensity, and specific acoustic impedance; normal and oblique incidence reflection and transmission from plane boundaries; transmission through a layer; image theory and surface interference; sound absorption and dispersion for classical and relaxing fluids; acoustic behavior of sources and arrays, acoustical reciprocity, continuous line source, plane circular piston, radiation impedance, and the steered line array; transducer properties, sensitivities, and calibration. Laboratory experiments include longitudinal waves in an air-filled tube, surface interference, properties of underwater transducers, three-element array, speed of sound in water, and absorption in gases. Textbook: Kinsler, Frey, Coppens, and Sanders, Fundamentals of Acoustics, 4th Edition.
Lecture 30 - Attenuation of Sound: Acoustic Calculation