Diagrams of the Reaction Wheel Assembly (RWA) are presented along with charts and graphs illustrating jitter error model, induced vibration tests, radial displacement transfer function, and axial displacement power spectra density. The RWA isolator specification requirements are listed

Dougherty, H. J.

Haile, W. B.

Rodden, J. J.

English

NASA Technical Reports Server

N87-22742
1071
https://ntrs.nasa.gov/search.jsp?R=19870013309 2020-03-20T10:32:34+00:00Z
ORiGi_;AL _ _"tAG,. 13
OF POOR QUALITY
Pointing Control System Block Diagram
OICfTAL COMI_/T(a
MO*aENTUu
MA_ACIM|NI
C0illAliD
M_I| II A T_ll &tTIT_|
I¥|HICL_ ANO UPOAT |
PLbl
I:=..,[,°,
|OUAI|IINIUki | ACOUISI|ION
/ImOCISSING i
m
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A !
t f
U DVNJ_IICS
" o**o., i",i,
I
v I I ! I#=
Is $_ I
,
I|IMA(_
Torques
DISTill
/
/
/
/ /
1072
____ RWA UNIT I EOUIPNENT SECTION BAY DETAILS
ORi_;_L PAG_ 13
OF POOR QUALITY
N£
PIN /_IS
i
m_/B
IP|N AXIS - .
/
OvEIt_ltl;**/ * $3_ _Q. 5t(.T.
\/
\ \
_-/---'-----['" _ ] 1 _ -_ I _,
ST RWA INDUCED VIBRATION TEST
Ill
I00
72
0
o
• =,.
810 RPM WHEIL SPIkiP
1
J
i,
WI4EEL UNI_LANCE DEIIRINg TERIq
,,., i,...,,,,,_'_ ,t -*,,
IO
m
IBEnRINE TERI"FJ
i I
L,___I_,_ _,
2O 3O '°0 5O 60 70 OO O0
HERTZ
5
MOOEp AXIAL
1073
RWA JITTER PREDICTION FOR #I005 (_/8S}
HRROHOUNT[O RNR INOUCEO JITT[R: 1005
RWA WHEEL SPEED / AERO TORQUE
..----.- SENSITIVITY RESULTS--.V2 POP
5O
3
3O
! , l I I .!
O. 02 O. Oq O. 06 O. 08PEAK AERO TORQUE 0.12
IN-ml
ATMOSPHERIC 3 10-12 10-12 10 -12 10-12 10-12 10-12
DENSITY (Kglm) 1.5 x 3 x 1.5 x 6 x 7.1115 x _ x
SOLAR ACTIVITY ALTITUDE (Km)
LOW 535 _80 qSS q30 qlO _OS
HIGH 750 655 605 570 S35 S25
NON_AI. HST ALTITUDE_ 13 .Clio K_
1074
NOISY W_EEL
ORIGINAL PAGE I_
OF POOR QUALITY
14AROMOUNTEO R.N.R, 1002 INDUCED JITTER
tll 1,t[ 0. I._, rOCt_L t_t11_
OI_I_IC _00[L Or NOV, 19_d4 I.V. 0nlm 0f 2_8S
Jt
;l : : i : : : : : : : : : i : ! i i --
l.-.i...i.-i...i..i-.::.._..i..i...i.i,i !._ _ _._ i
:_l:l...i..j..i..i..i..i'li. i. i.iI I ::: i i i i
..-i-..',..i..%1i. i.i...i.i..i i.-i
, F!--_--_--__-__11_, iI11-Jt_NIT__T_! li ,,,:,.,,,......" ,.'.',..-if : : : : : *.lI', :.II_"_llI r.'_l: :,': q ul. I_I_LLI t_l¥ LJ_4 ¥ 014111i0 r /_'l
___ ..;..;..._...;.._....:. , ; ; ..:, . ; ; . _-.
=__ L!!ili _ Ll_;iiiill ......_ _lli ......_.....
............ _;,; _',_o..,'........... _'_' 'i' _" i i _i i ..'! i _:'_... :':
Ii---!-_-_i_iH......iii_iii......ii
_ .-L.LLi,..i...!.i..i .i......_..,_,..!_....i....... .,
i-iii]-ii i--ii-i-] i!!i ! -. _
_FW'ItON _.[k _I_.FO IHZI 8
RWA ISOLATOR SPEC REQUIREMENTS
PARAMETER
• AXIAL STIFFNESS
I LATERAL STIFFNESS
e AXItL DAMPING
• LATERAL DAMPING
I MEET DYNAMIC PROPERTIES WITH
STATIC IG LOAD ON 3 UNITS
• ENVIRONMENT
e LIFE
e WEIGHT
REQUIREMENT
900-1100 LBIIN
1380-1870 LBIIN
.300-.060
(O = 3 TO 20)
.170 - ,025
(O • 3 TO 20)
37.0 LB AXIAL
102,0 LB RADIAL
TEMP: -20 F TO +]20 F
PRESSURE: 810 TO 10-13 TORR
ACCEL.: 9.2 O'S FOR 1.5 MIN.
RANDOM VIB: 6.18 g (rms) OVERALL
UNIT: 2 YEARS GROUND
5 YEARS ORBITAL
DAMPING ELEMENT: 7 YEARS
4,0 LBS MAX PER ISOLATOR
1075
___'_/I VIBRATION ISOLATION SYSTEM ON AN RWA
/
U
REACTION WHEEL
ASSEMBLY WITH $
ISOLATOR UNITS
/
N
DAMPER SUBASSEMBLY
CUT-AWAY
7
D i
)
IN
"1
_ **4--
K I
•_:4..I..
IS:_.....
..,..
-..I,-.
IS:-L--'_--
-t._
_ .
kid
150LRTL'O R.X.R, 1002 lNt_ JlT'l_
m 11C O.T._. ri_N. RLA4[ - FI.IBfl lSOL _ OWi_ IW40 t"_
01PoetIC _ Or MOV. 114 _ I-V _1 or 3/ES
-*-4 ,**J ......... _ ............. 4 ............
"'-;I..........11..........:I:....,*-0--- '_
I
.--i---':-"....___._. ...........IZ]......:' L. """"..........., ..........::LL'_'""'!K _l __': ......'' ":':," _""-.... I_...:=-"!i _..
"* "--i'_m mm.'i" smom'i" ¢_s' _ b_
• _N_LY$1$ SHOWS THAT
I,_OL_'r£D RWAs WILL-
MOSTLY RENAIN WITHIN
THF-IR _lTrd_R g_DGEr5
lily"lION MIICI3. _ 11411
II
1076
ORIGINAL PA_ : 1_
POOR QUALITY
,",.*+u._ _S
OF POOR QUALITY
Unit Isolator
114AFT_
PI|TON +_Q. _
SASE
!
_..it-"
_FLUIO
pRRING I_l
_nE LLOWS 121
AXXIAL
$1AtPt.IF IE D
_HEMATiC
Radial Displacement Transfer Function
INPUT
10 30
FI1EOUINCY 11111
12
13
1077
10-|
10"10
Axial Displacement Po_er S¢ectral DenSity
1078


Vibration isolation for line of sight performance improvement

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