A Study of the Nearfield of an Excited Spherical Shell.
Abstract
In this study, the acoustic near field of excited spherical shells is investigated. The interaction of the acoustic medium with the vibration response of an elastic spherical shell due to an excitation by a point force or an acoustic point source is investigated analytically and experimentally. Thus, only axisymmetric, nontorsional motion of the spherical shell is considered, with a thin shell theory that includes extensional and bending deformation. The elastic spherical shell resonances were computed when in vacuo and when submerged in light (air and heavy (water) acoustic medium. These were verified experimentally by testing two duralumin shells, a = 8 inches in radius and wall thicknesses h = 0.0514 and 0.1069 inch. The measured resonance frequencies were within 5% of those predicted in air and in water for identified mode numbers up to 34. The measured mean-line driving point admittance also agreed well with the predicted ones to within 3 dB.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 17, 1980
- Accession Number
- ADA086008
Entities
People
- Edmond Wong
Organizations
- Pennsylvania State University