Fast, accurate technique for simulating the Saturn Flight Control System was devised. The technique is simple to implement and can be readily substituted for slower or less accurate techniques. This technique can be applied to a large class of problems that require a rapid accurate calculation of the response of linear differential equations to a continuous input

Hays, J. R.

English

NASA Technical Reports Server

December 1968	 Brief 68-10569 
NASA TECH BRIEF 
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. 
Accurate Digital Technique Simulates Flight Control System 
A fast, accurate technique for simulating the Saturn 
Flight Control System has been devised. The tech-
nique is simple to implement and can be readily sub-
stituted for slower or less accurate techniques. In this 
technique, an analytical solution for the flight control 
filters is based on the step nature of the error signals. 
The input to the engine actuators for each time frame 
is considered to consist of step changes (caused by dc 
bypass and gain changes) plus the time-varying output 
of the filters. The output of the filters is approximated 
over each time frame by a linear segment. The result-
ing analytical solution is appropriately rate- and posi-
tion-limited to provide engine deflections. 
This technique can be applied to a large class of 
problems that require a rapid accurate calculation of 
the response of linear differential equations to a con-
tinuous input.
Note: 
Documentation is available from: 
Clearinghouse of Federal Scientific 
and Technical Information 
Springfield, Virginia 22151 
Price $3.00 
Reference: B68-10569 
Patent status: 
No patent action is contemplated by NASA. 
Source: J. R. Hays 
of The Boeing Company 
under contract to 
Marshall Space Flight Center 
(M FS- 14787) 
Category 02 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19680000525 2020-03-12T06:33:11+00:00Z


Accurate digital technique simulates flight control system

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