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