Using stiffness matrix and lumped-mass representation specified number of natural frequencies are obtained using inverse iteration method. Mode shapes for each frequency are also obtained. These frequencies and mode shapes can be found in reasonable periods of computer time utilizing this code

Haisler, W. E.

Mcwhorter, L. B.

English

NASA Technical Reports Server

February 1974	 B73-10444 
NASA TECH BRIEF 
Lyndon B. Johnson Space Center 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
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be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Frequencies and Modes for Shells of Revolution (FAMSOR) 
The problem: Notes: 
A computer program to determine the natural fre- 1. This program was written in FORTRAN IV for the 
quency and mode shapes of a shell of revolution was IBM 360 and the CDC 6000 series computers. 
needed. 2. Inquiries concerning this program should be directed 
to: 
The solution: COSMIC 
A stiffness matrix method is used to determine the University of Georgia 
necessary frequencies and mode shapes. 112 Barrow Hall 
Athens, Georgia 30602 
How it's done: Reference: MSC-14497 
Using the stiffness matrix generated by SAMMSOR 
(NASA Tech Brief B73-10444), and a lumped-mass Source: L. B. McWhorter and W. E. Haisler of 
representation developed	 from	 the	 consistent	 mass Texas A&M University 
matrix generated by SAMMSOR, a specified number of under contract t& 
natural frequencies (beginning with the lowest or funda- Johnson Space Center 
mental frequency) are obtained using the inverse itera- .	 (MSC-14497) 
tion method. The mode shapes for each of the fre-
quencies are also obtained. These frequencies and mode 
shapes can be found in reasonable periods of computer 
time utilizing this code.
,,. 
..
Category 09,06 
This document was prepared under the sponsorship of the National
	
Government assumes any liability resulting from the use of the 
Aeronautics 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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Frequencies and modes for shells of revolution (FAMSOR)

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