Research On Nonlinear Acoustics

Item

Title
Research On Nonlinear Acoustics
Date
1967
Index Abstract
Not Available
Photo Quality
Not Needed
Report Number
AMRL TR 67-54
Creator
Ablow, Clarence M.
McCulley, Leonard D.
Muller, George M.
Penico, Anthony J.
Rajapakse, Yapa D.
Corporate Author
Stanford Research Inst Menlo Park Calif
Laboratory
Aerospace Medical Research Laboratories
Date Issued
1967-12-01
Extent
188
Identifier
AD0667223
Access Rights
Distribution of this document is unlimited. It may be released to the Clearinghouse, Department of Commerce, for sale to the general public.
Distribution Classification
1
Contract
AF 33(615)-2234
DoD Project
7231
DoD Task
723105
DTIC Record Exists
No
Distribution Change Authority Correspondence
None
Distribution Conflict
No
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.
Report Availability
Full text available
Provenance
Lockheed Martin Missiles & Fire Control
Type
report
Format
1 online resource