Digital six-degrees-of-freedom, open loop Saturn 5 first stage flight evaluation simulation program obtains post flight simulation of the launch vehicle using actual flight data as input. Results are compared with measured data. For preflight analysis, the program uses predicted flight data as input

Gregory, B. R.

English

NASA Technical Reports Server

November 1970	 Brief 70-10605 
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nology Utilization Division, NASA, Code UT, Washington, D.C. 20546. 
Post Flight Dynamic Analysis Simulation 
The problem: 
To obtain post flight simulation of a vehicle using 
actual flight data as input. 
The solution: 
The Post Flight Dynamic Analysis Simulation pro-
gram is a digital six-degrees-of-freedom, open loop 
Saturn V first stage flight evaluation simulation. 
How it's done: 
The program is designed primarily for post flight 
simulation of the Saturn V vehicle using the actual 
flight data as input. Results are compared with meas-
ured data and used to analyze and explain any anom-
alies occurring during S-IC flight. Similarly, for pre-
flight analysis the program uses predicted flight data 
as input. It utilizes a Z-transform control system and a 
Runge —Kuta—Gill integration scheme. The general 
capabilities are: coupled flex and slosh dynamics; a 
first or third order actuator model; distributed aero-
dynamics; and off-nominal and malfunction opera-
tion. Output is a printout, a plot tape and a USAF 
format flight evaluation tape. 
Data tables and/or as many as six post flight tapes 
comprise the input. Input data include vehicle physi-
cal characteristics as well as in-flight environmental 
data as follows: individual engine thrust, lumped mass 
characteristics, atmospheric parameters, wind data, 
aerodynamic drag and system misalignments. 
Notes: 
1. This program, originally applied to Saturn V 
evaluation, has good potential for industrial appli-
cation. Analytical simulation could form the model 
for predicting /studying the dynamics of major sys-
tems interaction. 
2. The program is written in FORTRAN I-I language 
for use on the IBM 360 computer. 
Inquiries may be directed to: 
COSMIC 
Barrow Hall 
University of Georgia 
Athens, Georgia 30601 
Reference: B70-10605 
Source: B. R. Gregory of

The Boeing Company

under contract to

Marshall Space Flight Center

(M FS- 15067) 
Category 09 
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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 
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Post Flight Dynamic Analysis Simulation

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