New cross-power spectral density computation technique has been developed, as well as a technique for discrimination between periodic and random signals. This development is applicable to analysis of any stationary random process, and can be used in the aerospace and transportation fields

Simon, W. E.

Walker, L. A.

English

NASA Technical Reports Server

December 1967	 Brief 67-10602 
NASA TECH BRIEF	
-I& 
NASA Tech Briefs are issued to summarize specific innovations derived from the U.S. space program, 
to encourage their commercial application. Copies are available to the public at 15 cents each 
from the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
New Technique for Determination of Cross-Power 
Spectral Density with Damped Oscillators 
.
A new technique for computation of cross-power 
spectral density has been developed and programmed. 
In addition, a technique for discrimination between 
periodic and random signals has been developed 
which does not depend on either the spectral density 
or the amplitude distribution of the signal. Compu-
tations have been performed for a variety of signals 
with known characteristics with very satisfactory 
results. 
This development is applicable to analysis of any 
stationary random process. It has been used in the 
analysis of unsteady pressures in separated flow (cross 
flow around a circular cylinder). The technique can be 
used in the following areas: 
I. Aerospace 
a. Unsteady transonic flow 
b. turbulent flow (i.e., clear air turbulence) 
C. flight test structural dynamics data 
2. Transportation 
a. Roadbed roughness data 
b. wave height data to characterize sea states 
c. structural dynamic data.
Note: 
Additional details are contained in: A New Tech-
nique for Determination of Cross-Power Spectral 
Density with Damped Oscillators, by Wayne E. Simon 
and Louise A. Walker, Informal Report No. 18, 
Martin Marietta Corporation, July 1967. 
Copies of this report are available from: 
Technology Utilization Officer, 
Marshall Space Flight Center 
Huntsville, Alabama 35812 
Reference: B67-10602 
Patent status: 
No patent action is contemplated by NASA. 
Source: W. E. Simon and L. A. Walker

of Martin Marietta Corporation
under contract to

Marshall Space Flight Center 
(MFS-14022) 
Category 02 
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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New technique for determination of cross-power spectral density with damped oscillators

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