SURFACE ROUGHNESS AFFECTS BOTH THE SHAPE OF AN ULTRASONIC IMPULSE TRANSMITTED THROUGH AN INTERFACE AND ITS POWER SPECTRUM.

Award Information
Agency:
Department of Defense
Branch
Army
Amount:
$48,651.00
Award Year:
1986
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Award Id:
4026
Agency Tracking Number:
4026
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Rt 3 - Box 212, Stillwater, OK, 74074
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
JAMES N LANGE
(405) 377-0826
Business Contact:
() -
Research Institute:
n/a
Abstract
SURFACE ROUGHNESS AFFECTS BOTH THE SHAPE OF AN ULTRASONIC IMPULSE TRANSMITTED THROUGH AN INTERFACE AND ITS POWER SPECTRUM. TO FULLY APPLY ADVANCED SIGNAL ANALYSIS TECHNIQUES TO DETERMINING QUANTITATIVE INFORMATION ABOUT DEFECTS AND IMPERFECTIONS IT IS NECESSARY TO COMPENSATE FOR THE FREQUENCY DEPENDENT EFFECTS INTRODUCED BY SURFACE ROUGHNESS. THIS PROJECT PROPOSES TO MODEL SURFACE ROUGHNESS TO OBTAIN A MEANS OF NUMERICALLY EVALUATING ITS EFFECT ON BOTH THE POWER SPECTRUM OF A TRANSMITTED IMPULSE AND THE TEMPORAL TRANSMITTED SIGNAL. THE ROUGHNESS IS SCALED RELATIVE TO AN ACOUSTIC WAVELENGTH AND IS DIVIDED INTO FINE GRAINED AND LARGE SCALE IRREGULARITIES. THE FINE GRAINED ROUGHNESS IS MODELED BY AN INTERVENING LAYER WITH EFFECTIVE PHYSICAL PROPERTIES. THE SOLUTION TO THE MODEL ROUGHNESS CONFIGURATION PROVIDES A TRANSFER FUNCTION WHICH YIELDS THE FOURIER SPECTRUM OF THE TRANSMITTED IMPULSE FROM WHICH THE POWER SPECTRUM IS DETERMINED. BY COMPENSATING FOR THE EFFECT OF SURFACE ROUGHNESS, A MORE DETAILED QUANTITATIVE ANALYSIS OF DEFECT STRUCTURE IS POSSIBLE.

* information listed above is at the time of submission.

Agency Micro-sites


SBA logo

Department of Agriculture logo

Department of Commerce logo

Department of Defense logo

Department of Education logo

Department of Energy logo

Department of Health and Human Services logo

Department of Homeland Security logo

Department of Transportation logo

Enviromental Protection Agency logo

National Aeronautics and Space Administration logo

National Science Foundation logo
US Flag An Official Website of the United States Government