Computer program provides capability for analyzing accelerometer data obtained from impulsive testing of large antennas, and of determining from that data pertinent characteristics /amplitude, frequency, damping/ of the structural modes excited by the impulse

Galef, A. E.

English

NASA Technical Reports Server

January 1971	 Brief 71-10017 
NASA TECH BRIEF 
Goddard Space Flight Center
	
_4V 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
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be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Tracking Antenna Deformation Program 
The problem: 
To provide the capability for analyzing accelerom-
eter data obtained from impulsive testing of large 
antennas, and of determining from that data pertinent 
characteristics (amplitude, frequency, damping) of the 
structural modes excited by the impulse. 
The solution: 
A computer technique for determining modal char-
acteristics of a linear structure excited by an impulse. 
How it's done: 
The program employs the Fast Fourier Transform 
to determine the structure response function refer-
enced to the point on the structure where motion 
is measured. The program examines the imaginary 
portion of the response function by employing an 
iterative technique that, in the limit, permits examin-
ing that portion of the response function which 
represents the response contribution from each of the 
separate modes that respond to the impulse.
Notes: 
1. This program is written in FORTRAN (90%) 
and ASSEMBLER (10%) languages for the IBM-
360 or XDS-Sigma V computers. 
2. For further information contact: 
COSMIC 
Barrow Hall 
University of Georgia 
Athens, Georgia 30601 
Reference: B71-10017 
Patent status: 
No patent action is contemplated by NASA. 
Source: A. E. Galef of

TRW Systems Group
under contract to
Goddard Space Flight Center
(GSC- l 1191) 
Category 09 
This documetct was prepared under the sponsorship of the National	 Government assumes any liability resulting from the use of the 
Aefonautics and Space Administration. Neither the United States	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States	 will be free from privately owned rights.
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Tracking antenna deformation program

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