FARFIELD PRESSURE OF RANDOMLY VIBRATING STRUCTURES OVER GIVEN FREQUENCY BANDS.
Abstract
A relation between the cross spectral density of the farfield pressure outside a surface surrounding a sound source is given in terms of cross spectral density of the normal acceleration over a surface surrounding the source; the cross spectral density of the acceleration is given in terms of the modes of the structure. A resulting multipole expansion for the mean square farfield pressure in low frequency bands is derived using a free field Green's Function. An expression for the magnitude and directivity of the farfield mean square pressure from various types of motions in any frequency band is obtained. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1965
- Accession Number
- AD0626438
Entities
People
- Joshua E. Greenspon