NASA Logo, External Link
Facebook icon, External Link to NASA STI page on Facebook Twitter icon, External Link to NASA STI on Twitter YouTube icon, External Link to NASA STI Channel on YouTube RSS icon, External Link to New NASA STI RSS Feed AddThis share icon
 

Record Details

Record 68 of 21891
Plane waves at or near grazing incidence in the parabolic approximation. [acoustic equations of motion for sound fields]
Author and Affiliation:
Mcaninch, G. L.(Joint Institute for the Advancement of Flight Sciences, Hampton, Va., United States)
Myers, M. K.(Joint Institute for the Advancement of Flight Sciences, Hampton, Va., George Washington University)
Abstract: The parabolic approximation for the acoustic equations of motion is applied to the study of the sound field generated by a plane wave at or near grazing incidence to a finite impedance boundary. It is shown how this approximation accounts for effects neglected in the usual plane wave reflection analysis which, at grazing incidence, erroneously predicts complete cancellation of the incident field by the reflected field. Examples are presented which illustrate that the solution obtained by the parabolic approximation contains several of the physical phenomena known to occur in wave propagation near an absorbing boundary.
Publication Date: Jun 01, 1980
Document ID:
19800051776
(Acquired Nov 30, 1995)
Accession Number: 80A35946
Subject Category: ACOUSTICS
Report/Patent Number: AIAA PAPER 80-0974
Document Type: Conference Paper
Publisher Information: United States
Meeting Information: Aeroacoustics Conference; 6th; June 4-6, 1980; Hartford, CT
Meeting Sponsor: American Institute of Aeronautics and Astronautics
Contract/Grant/Task Num: NGR-09-010-064
Financial Sponsor: NASA; United States
Organization Source: Joint Inst. for Advancement of Flight Sciences; Hampton, VA, United States
George Washington Univ.; Washington, DC, United States
Description: 6p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ACOUSTIC IMPEDANCE; ACOUSTIC PROPAGATION; EQUATIONS OF MOTION; GRAZING INCIDENCE; PLANE WAVES; SOUND FIELDS; APPROXIMATION; BOUNDARY VALUE PROBLEMS; PARABOLAS
Imprint And Other Notes: American Institute of Aeronautics and Astronautics, Aeroacoustics Conference, 6th, Hartford, Conn., June 4-6, 1980, 6 p.
Availability Source: Other Sources
› Back to Top
Find Similar Records
NASA Logo, External Link
NASA Official: Gerald Steeman
Site Curator: STI Program
Last Modified: August 16, 2011
Contact Us