A formal structure for advanced automatic flight-control systems
FORMAL $ 1
3
STRUCTURE FOR ADVANCED
AUTOMATIC FLIGHT-CONTROL SYSTEMS(
George Meyer and Lzligi Cicolani Ames Research Center
Moffett Field, Gal$ 94035
FATIONAL 3AERONAUTICS AND SPACE ADMIN.---
1
WASHINGTON, D. C.
3,"%.I@
GAY w)75
I
__1. Report No.
TN D-7940
2. Government Accession No.
7. Author(s)
George Meyer and Luigi Cicblani
9. Performing Organization Name and Address
Ames Research Center Moffett Field, Calif., 94035
12. Sponsoring Agency Name and Address
National Aeronautics and Space Administration Washington, D. C. 20546
15. Supplementary Notes
TECH LIBRARY KAFB, N M
IIlil1111/1l1/1l11l1111111I1l1Il 0333435
5. Report Date
May 1975
6. Performing Organization Code
8. Performing Organization Report No.
A-5710
10. work Unit No.
501-03-11
11. Contract or Grant No.
13. Type o f Report and Period Covered
Technical Note
14. Sponsoring Agency Code
__
16. Abstract
An effort is underway at Ames Research Center to develop techniques for the unified design of multimode, variable authority automatic flight-control systems for powered-lift STOL and VTOL aircraft. This report describes a structure for such systems which has been developed to deal with the strong nonlinearities inherent in this class of aircraft, to admit automatic coupling with advanced air traffic control requiring accurate execution of complex trajectories, and to admit a variety of active control tasks. The specific case being considered is the augmentor wing jet STOL research aircraft.
~
7. Key Words (Suggested by Author(sJ)
Handling qualities Flight controls Autopilot
18. Distribution Statement
- Unclassified unlimited
.- .
19. Security Classif. (of this report)
Unclassified
1 20; Security Classif. (of this page)
Unclassified
~~~
21. No. o f Pages
39
~~~~
*For sale by the National Technical Information Service, Springfield, Virginia 22151
22. Price'
$3.75
TABLE OF CONTENTS
Page
SYMBOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
BASIC COMMANDS TO AUTOMATIC FLIGHT-CONTROL SYSTEM . . . . . . . . . . . . 4
TRACKING ACCURACY . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
EQUATIONSOFMOTION . . . . . . . . . . . . . . . . . . . . . . . . . . .
8
. . AUGMENTOR WING JET STOL RESEARCH AIRCRAFT . . . . . . . . . . . . . . 13
. TheTrimmap . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Perturbation . Controller . . . . . . . . . . . . . . . . . . . . . . 18
Angular Acceleration . Controller . . . . . . . . . . . . . . . . . . 23
Trajectory Command Generator . . . . . . . . . . . . . . . . . . . . 27
. . . . . PROPOSED STRUCTURE FOR ADVANCED AUTOMATIC FLIGHT-CONTROL SYSTEMS
31
CONCLUSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
. REFERENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
iii I-
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