Accession Number:

AD0747648

Title:

Reflection and Transmission at a Plane Screen with Periodically Arranged Circular or Elliptical Apertures.

Descriptive Note:

Technical rept.,

Corporate Author:

STANFORD UNIV CALIF DEPT OF MATHEMATICS

Personal Author(s):

• Leppington,Frank G.
• Levine,Harold

Report Date:

1972-08-21

Pagination or Media Count:

37.0

Abstract:

Theoretical estimates are given for the scattered acoustic wave amplitudes which result if a plane wave is incident on a perforated screen containing a periodic array of circular or elliptical apertures, on the twin assumptions that 1 the wave length greatly exceeds the aperture spacings and 2 the aperture dimensions are small compared to the spacings. The effect of a parallel backing plane is described and the impedance of a plane with a regular array of baffled pistons is calculated. Author

Descriptors:

• *SOUND TRANSMISSION
• ORIFICES
• REFLECTION
• BOUNDARY VALUE PROBLEMS
• WAVE FUNCTIONS
• ACOUSTIC IMPEDANCE

Subject Categories:

• Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE