https://ntrs.nasa.gov/search.jsp? ... This research was supported by the NASA l,angley Research Center under gran', number ...... JOB : OPTION CONTROL. C.
NASA
Contractor
Report
177943,
Volume [I
D
ANALYSIS OF FLEXIBLE AIRCRAFT LONGITUDINAL DYNAMICSANDHANDLINGQUALITIES VOLUMEII
Martin
DATA
R. Waszak and David K. Schmidt
(NASA-C_-I77943-Vol-2} ANALYSi3 OF FLEXIBLB AIRCHAFT LONGITUDINAL DYNAMICS AND HANDLING QUALITITS, VOLU._E 2 : DATA (Purdue Univ, ) 243 p HC &II/MF &01 CSCL _,IC
N85-352_13
_3/[8
Unclas 22275
PURDUEUNIVERSITY !Vest Lafayette, Indiana
Grant NAGI-254 June 1985
_"__"3
,_
i
NationalAeronauticsand Space Administration
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LangleyResearchCenter Hampton,VPrgJnJa 23665
_.
ANALYSIS OF FLEXIBLE AIRCRAFT LONGITUDINAL DYNAMICS AND IIANDI.ING QUALITIES w
VOLUME II - DATA
Martin R. Waszak " David K Schmidt "
School of Aeronaulics and Astronautics Purdue University West Lafayette, IN
June 1985
* Graduate Student ** Professor
"
;4
ACK NOWLEDGMENTS
This research was supported by the NASA l,angley Research Center under gran', number NAG-I-25-t. Thanks go to Mr. William Grantham and Mr. Jerry Elliot who have served as technical monitors. Addflional thanks go to J.B. Davidson and F.A. Leban for advice and assistance which aided this research.
i
.°°
111
TABLE OF CONTENTS
Page
LIST OF TABLES ...........................................................................................
v
IAST OF FIGURES ........................................................................................
vi
LIST OF S'_%,1BOLS......................................................................................
ix
SUMMAI_ Y....................................................................................................
xii
VOL[JME I CtL_I'TER
" I I INTRODUCT.ON .....................................................................
1
CIL'O'TEIt II BACKGROUND .....................................................................
3
CItAPTER IIl EXPERIMENTAL DATA BASE ..........................................
10
CHAPTER IV OPEN-LOOP MODAl. ANALYSIS .....................................
19
Modal Analysis .......................................................................................... Vehicle Model ............................................................................................ Application to Data Base Configurations .................................................. Numerical Results ..................................................................................... CttAPTEP
V CLOSED-LOOP ANALYSIS ................................................
NeaI-Smith/Bacon Methodology ............................................................... Extension of Neal-Smith/Bacon Methodology ........................................... Application of the NeaI-Smith/Bacon Analysis to the Data Base Configurations .............................................................. Numerical Results ..................................................................................... CHAPTER
VI
CONCLUSIONS
...................................................................
LIST OF REFERENCES ..............................................................................
PRECEDING PAGE BLANK NOT FILMED
19 24 28 32 52 52 61 68 76 85
"
87
_
iY
Page APPENDICES Appendix A.I Scaling Transformation for Mode Identification .........................................................................
89
Appendix A.2 nz in Terms of Vehicle States ............................................
92
VOLUME II Appendix A.3 Vehicle Configurations and Modal Analysis Results ..................................................................
96
Configuration 1 .................................................................................... Configuration 2 .................................................................................... Configuration 3 .................................................................................... Con figurat.,ion 4 .................................................................................... Configuration 5 .................................................................................... Configuration 6 .................................................................................... Configuration 7 .................................................................................... Configuration 8 ....................................................................................
100 11g 137 155 173 19I 209 227
Appendix A.4 Aeroelastic-Structural Appendix A.50CM
Mode Shapes ................................
Frequency Responses .............................................
Append!x A.6 Listing of Source Code for Modal Analysis Program ...............................................................
2,15 251
28!
LIST OF TABLES
Table
6
Page
3.1
Summary of Data Base Configurations ................................................
12
3.2
Summary of Tracking Error, Pilot Rating and Pilot Comments ...................................................................................
14
4.1
Summary of Navion Longitudinal Dynamics .......................................
23
5.1
Comparison of Resonance Peak and SP Values ..................................
67
5.2
Summary of Closed-Loop Analysis Inputs ...........................................
75
5.3
Summary of Closed-Loop Analysis of Data Base Configurations ....................................................................
82
vi
LIST OF FIGURES t
Figure
Pal_e
2.1
Pole-Zero Plot of Typical Flexible Aircraft ............................................
4
2.2
Pole-Zero Plot, of Simple Example ..........................................................
5
3.1
Geometry of Dala Base Configurations .................................................
il
3.2
Rigid and Elastic Pitch Angles .............................................................
13
3.3
Simulation Visual Display .....................................................................
15
3.4
Simulation Tracking Errors ..................................................................
16
3.5
Simulation Pilot Ratings ......................................................................
17
4.1
Rigid and Elasiic Pitch Angles .............................................................
30
4.2
Pilot Impulse Residue Magnitudes-
qonfig. 1......................................
33
4.3
I'ilot l_mpulse Residue Magnitudes - Config. 2 ......................................
3,1
4.4
Pilot Impulse Residue Magnitudes - Config. 3 ......................................
35
4.5
Pilot hnpulse Residue Magnitudes-
Config. 4 ......................................
36
4.6
Pilot Impulse Residue Magnitudes-
Config. 5 ......................................
37
4.7
Pilot Impulse Residue Magnitudes-
Config. O.....................................
38
4.8
Pilot Impulse Residue Magnitudes-
Config. 7 ......................................
39
4.9
Pilot Impulse Residue Magnitudes-
Config. 8 ......................................
40
\
vii
Figure
Page
4.10
Gust Impulse Residue Magnitudes - Config. 1 .....................................
43
4.11
Gust Impulse Residue Magnitudes - Config. 2 .....................................
44
4.12
Gust Impulse Residue Magnitudes - Config. 3 .....................................
45
4.13
Gust Impulse Residue Magnitudes - Config. 4 ....................................
46
4.14
Gust Impulse Residue Magnitudes - Config. 5 .....................................
47
4.15
Gust Impulse Residue Magnitudes - Config. 6 .....................................
48
4.16
Gust Impulse Residue Magnitudes - Config. 7 .....................................
40
417
Gust Impulse Residue Magnitudes - Coufig. 8 .....................................
50
5.1
Neal-Smith Model Structure .................................................................
54
5.2
Frequency Response Specifications .......................................................
55
5.3
Neal-Smith Criteria ..............................................................................
57
5.4
OCM Block Diagram ............................................................................
50
5.5
Resonance Peak Adjustment ................................................................
62
5.0
Neal-Smith/Bacon
Pilot Compensation ................................................
63
5.7
Neal-Smith/Bacon
Criteria ...................................................................
64
5.8
Pilot Rating ve:sus Bandwidth for Neal-Smith/Bacon Configurations ........................................................
65
5.9
SP versus PC for Neal-Smith Configurations .......................................
6g
_:
5.10
Dynamics of Neal-Smith Configurations ..............................................
70
_
5.11
Dynamics of Flexible Configurations ....................................................
71
:_
5.12
Block Diagram of Tracking Analysis ....................................................
74 ',%
,,,
VIII
Figure
Page
5.13
Example: OCM Frequency Response - Config. 8 .................................
77
5.14
PR versus BW for Data Base Configurations ......................................
81
5.15
SP versus PC for Data Base Configurations ........................................
83
Appendix Figure
l ! ;
A.4.1 Mode Shape Sign Conventions ..........................................................
246
A.4.2 Aeroelastic-Structural Mode Shape - Mode I.....................................
247
A.4,3 Aeroelastic-Structural Mode Shape - Mode 2.....................................
248
A.4.4 Aeroelastic-Struetural Mode Shape - Mode 3 .....................................
2.19
?,.4.5 Aeroelastic-Structural Mode Shape - Mode 4 .....................................
250
A.5.10CM
Frequency Responses - Config. 1..............................................
252
A.5.20CM
Frequency Respc,nses- Config. 2 ..............................................
256
A.5.30CM
Frequency Responses - Config. 3 ..............................................
260
A.5.40CM
Fr_.queney Responses - Config. 4 ..............................................
264
A.5.5 OCM Frequency Responses - Config. 5 ..............................................
268
A.5.60CM
272
Frequency Responses - Config. 6..............................................
,
#L
A.5.7 OCM Frequency Responses - Config. 7 ..............................................
276
A.5.80CM
280
Frequency Responses - Config. 8 ..............................................
ix
LIST OF SYMBOLS
Symbol
•
4
Meaning
A(.) .....................................
plant matrices
B(} ..................................... B ....................................... BW ................................... C ........................................ (_ .......................................
control matrices modal controllability matrix bandwidth frequency output matrix (for states) modal observability matrix
DI.) ..................................... D ....................................... E ........................................ F ........................................
disturbance matrices modal disturbability matrix output matrix (forcontrols) output matrix (for disturbances)
G(.) ..................................... G(s) .................................... It(s) ....................................
control matrices plant transfer functions pilot transfer function
Jp ....................................... Kp ...................................... Kx ....................................
pilot objective functional pilot gain (feedforward) optimal control gains
AK ..................................... OCM .................................. PC ...................................... Q ........................................
incremental change in pilot gain Kp Optimal Control Model of the pilot pilot compensat ion wcighling matrix for output vector
Ji'l.) ..................................... SP ...................................... T ........................................
impulse residue sensilivity parameler modal matrix
VI.I......................................
in'.-.nsity of white noise (.)
g .........................................
weighting ¢_,:_ pilot input rate {tip}
Ix ........................................
distance from e.g. to pilot station
\
Symbol
Meaving
n z......................................
plunge acceleration
Pl) ...................................... it ........................................
pole of a transfer function modal state vector
r ......................................... u ....................................... i! .........................................
weighting on pilot input (up) perturbed forward velocity ([t/sec) input vector
v m......................................
motor noise
vy ....................................... w ......................................
obser,, ation noise Gaussian white noise
w ........................................
disturbance
x ......................................... _. .......................................
state vector state estimate
E ........................................
output
z() .......................................
zero of a transfer
_(.) .................................... .......................................
phase of impulse residue, R(.) angle of attack, (rad)
......................................
(g's)
vector vector
vector function
flight path angle, (rad)
b(.)...................................... ......................................... _"..........................................
control surface deflection attitude tracking error (0-0c) damping ratio
q .........................................
generalized
0_)...................................
attitude
),(.) .....................................
eigenvalue
vl. ) ................................... _"..........................
eigenvector damping ratio
a .......................... r ...................
real part ,,f eigenvalue. time delay. (see)
rn................................
neur,,-m, qor lag. Feel
o j .................................. 0'1) ................................. ._...............................
mode shape, Ift) mode slope, (ft/ft) imaginary part of eigenvalue.
deflection,
(dimensionless)
angle, (tad)
3,
X
xi
Symbol
Meaning operations
E{'} ....................................
expected value operator
]'1 .................................... [':'J....................................... l (-) .................................... (:) .......................................
magnitude of (.) complex conjugate of (-) phase angle of (.) time derivative of (.)
subscripts C ........................................
commanded
R .......................................
rigid-body
T ....................................... g ......................................... p ........................................ v. ........................................
total [rigid-body + elastic) gust pilot vehicle
y. ...................................
output or measurement
xi _
SU_4ARY
b
As aircraft become larger and lighter due to design requirements for increased payload and improved fuel efficiency, they may also become much more fl_,xible. For highly flexible vehicles, the handling qualities may not be accurat_,ly predicted by conventional methods. This study applies two allalysis methods to a family of flexible aircraft in order to investigate how and when str,et_lral (_pecially dynamic aeroelastic} effects affect the ,;ynamic characteristi
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2,15
Appendix Aeroelastic-Structural
A.4 Mode
Shapes
The mode shapes of the data base configurations are defined to be (l['fl(,('ti,,n_ in feet n¢)rm_.!ized so that for each mode the deflection at the n()s(, (i._'. F.S. 0) is (me f(),)t. The deflecti(,ns
are
to a set of
1,