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Preliminary characterization of a one-axis acoustic systemThe acoustic fields and levitation forces produced along the axis of a single-axis resonance system were measured. The system consisted of a St. Clair generator and a planar reflector. The levitation force was measured for bodies of various sizes and geometries (i.e., spheres, cylinders, and discs). The force was found to be roughly proportional to the volume of the body until the characteristic body radius reaches approximately 2/k (k = wave number). The acoustic pressures along the axis were modeled using Huygens principle and a method of imaging to approximate multiple reflections. The modeled pressures were found to be in reasonable agreement with those measured with a calibrated microphone.
Document ID
19790008479
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Oran, W. A. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Reiss, D. A. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Berge, L. H. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Parker, H. W. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
September 3, 2013
Publication Date
January 1, 1979
Subject Category
Acoustics
Report/Patent Number
NASA-TM-78213
Accession Number
79N16650
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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