History and current research in Nearfield Acoustical Holography

Since its inception in 1980 at Pennsylvania State University, Nearfield Acoustical Holography (NAH)  has seen over 40 years of continuous development finding its way into many avenues of research in air and underwater.  Its popularity arises from the ability to yield the reconstruction of three-dimensional spatial pressure and acoustic intensity fields, along with the normal velocity and intensity on the surface of noise sources, uncovering the dispersion physics of vibrations and unraveling of the sources of sound.  It has excelled as a research tool in experimental facilities for the study of the vibration of and radiation from underwater naval structures.  A research of current interest is the prediction of the complete farfield from cylindrical NAH measurements on internally excited, finite shells.  Work supported by the Office of Naval Research.

2019 : Dr. Earl Williams receives the prestigious Trent-Crede Medal for excellence in acoustic research. The Trent-Crede Medal is presented to an individual every two to six years who has made an outstanding contribution to the science of mechanical vibration and shock, as evidenced by publication of research results in professional journals or by other accomplishments in the field, the citation reads. The previous year the award was received was in 2011. Only 14 individuals have received the medal (not including Williams) since its inception in 1969.

2009 : Dr. Earl Williams was awarded the Per Bruel Gold Medal from the ASME “in recognition of eminent achievement and extraordinary merit in the field of noise control and acoustics.” 

Le lundi 23 mars 2026 à 11h00 / Amphithéâtre François Canac, LMA

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