Research On Nonlinear Acoustics

Download this report (PDF, 3.27 MB, 188 pages)
Report Number: AMRL TR 67-54
Author(s): Ablow, Clarence M., McCulley, Leonard D., Muller, George M., Penico, Anthony J., Rajapakse, Yapa D.
Corporate Author(s): Stanford Research Inst Menlo Park Calif
Laboratory: Aerospace Medical Research Laboratories
Date of Publication: 1967-12-01
Pages: 188
Contract: AF 33(615)-2234
DoD Project: 7231
DoD Task: 723105
Identifier: AD0667223

Abstract:
The possibility that nonlinear acoustic flows may be represented by spherical progressive waves (in the sense of Courant and Friedrichs) was examined and found to be unlikely. An iterative finite-difference method for the calculation of continuous periodic sphherical flows was developed together with a FORTRAN code, SPHERE, that implements the method. Sample calculations have shown that the code is effective but slow, and several ways for reducing the computation time are suggested. Convergence difficulties in one of the iterative loops were overcome vy the use of a semi-iterative underrelaxation scheme. When applied to linear systems, such semi-iterative schemes were found to be equivalent to a class of summability methods that may be regarded as generalizations of Euler summation.

Provenance: Lockheed Martin Missiles & Fire Control

Other options for obtaining this report:

Via the Defense Technical Information Center (DTIC):
A record for this report, and possibly a pdf download of the report, exists at DTIC

Via National Technical Report Library:
This report may be available for download from NTRL. Use the Title from this record to locate the item in DTIC Online

Indications of Public Availability
No digital image of an index entry indicating public availability is currently available
There has been no verification of an indication of public availability from an inside cover statement



Export