NASA CR- 144945 -1

Part 1 of 4

A COMPILATION OF SPACECRAFT LOADS DATA

FROM

FOUR TITAN CENTAUF'. 1-AUNCH VE-UCLE FLIGHTS

. a VOLUME I1

VIBRA TION-POWER SPECTRAL DENSITY ANALYSIS I

. OF LAUNCH AND MAX. Q FLIGHT

Compiled by George Kachadourian

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Prepared under Contract No. NAS1-9100 by GET\TTR-!.L ELECTKC COMPANY

'Ices Viking Project Support Ser\ ' Hampton, Virginia

for

NATIONAL AERONAUTICS AND SPACE ADMINISTRATION

January 1977 ,,

https://ntrs.nasa.gov/search.jsp?R=19770021238 2020-06-01T11:41:51+00:00Z

1. Rrlvwr No. 1 2. Govrrnmenr Accarlon No. 3. Rectptmt'r Qt~ lug No 1 NASA CR- 141945 -1 1 I

4. T~ t i r a td S~~bt t rc I 5. Retract Date A Compilation of Spacecraft Loads Data F r o m Four January 1977 Titan Centaur Launch Vehicle Flights 6. Patorn~lng Orgl~,ltar~on G ~ d u I-- -+ ! Volume I1 - PSD Analyses of Launch & Max Q -

7. Authot(sI

George Kachadourian ,

.9. Perfamng Organizrrlon Name md Address

12. S~r,so*lrig A3rn:v !&me 2nd Add~ess

National Aeronautics and Space Administration ' Langley Research Center, Hampton, Va. 23665 I ---- - I 15. Suyplcnwtarv !sots

This report is a compilation of PSD analyses processed by the Langley Research

Office. Center Analysis and Computation Division under thc direction of the Viking Project

16. Abstrd~t -i I The payloads car r ied by the f i r s t four Titan Centaur Launch Vehicle flights were i a Viking Dynamic Simulator, the Helios A Spacecraft and the two Viking Space- craft. Dynamic loads data were gathered by the NASA Viking Project Office from these four flights for applications to the Viking Spacecraft. This volume contains time histories and Power Spectral Density (PSD) analyses of vibration and i

General Electric Company Viking Program Support Services 17 Research Road, Hampton, Va. 23666

1 I acceleration measurements on the spacec~raft f rom the lst , 3rd and 4th Titan ! I Centaur launchings, TC-1, TC-4 and TC-3 respectively. Summary plots a r e

--- - 8. Prrforrnlng Orl)rnvla~toia t'rc.;rvt KO.

10. Wwk Uni! No.

4 11. Conrract or Grdtit hu.

NAS1-9100

13. Type of Repon ~ n d fertod Givered

also presented. 1

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L --,--- ---- ----- ---- I 17 Vv.4 Words ISugyatcld by Aurhoi i s ) ) 18. Distr~but~tn Sllte. nent

I Viking Spacecraft, Titan Centaur Vibration Envir0nmer.t Power Spectral Densit)

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19, Srvurity Clruif. (of th~s report) 20. Secur~ty Cldsslf. (of this rv~el 21. NO. of Pager ' 22. P~~cL. '

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NASA CR- 1449 45

I

A COMPILATION O F SPACECRAFT LOADS DATA

FROM

FOUR TITAN CENTAUR LAUNCH VEHICLE FLIGHTS

' VOLUME I1

VIBRATION POWER SPECTRAL DENSITY ANALYSES

LAUNCH AND MAX Q FLIGHT

ABSTRACT

The payloads c a r r i e d by the f i r s t four Titan Centaur Launch Vehicle Fl ights were , a Viking Spacecraf t Dynamic Simulator , the Helios-1 Spacecraf t and t h e two Viking Spacecraft . A wealth of dynamic loads data was accumulated b y the NASA Viking P r o j e c t Office f r o m these four f l ights f o r applicat ion t o the Viking Spacecraft . T h i s r e p o r t contains a compilat ion of that da ta and is p resen ted f o r r e f e r e n c e and information. The data h a s been compiled . into the following f ive Volumes:

Volume I - Acoustic Data (NASA CR-144944)

Volume I1 - Vibrat ion Power Spec t ra l Density Data (NASA CR-144945)

Volume 111 - Shock Spec t ra of T r a n s i e n t s (NASA CR-144946)

Volume IV - Titan Stage I and Centaur B u r n Oscil lat ion (NASA CR-1449.17)

Volume V - T i m e His tory P l o t s (NASA CR-144948)

Contents of Volume I1

1 - S u m m a r y Data I

2 - TC-1 Launch with Viking Dynamic Simulator

3 - TC-4 Launch with Viking A Spacec ra f t

4 - TC-3 Launch with Viking B Spacecraf t

Lis t of F ipures for Section 1 b

Number Description . Summary of Bus Acceleration PSD Summary of .VLC CG Acceleration PSD TC-1 Envelope of Bus & VLC cg PSD's TC- 1 Envelope of Bus PSD' s fo r Lift Off & Max Q TC-1 Envelope of VLC CG PSDts for Lift Off & Max Q TC- 1 Envelope of Lift Off PSD' s TC- 1 Envelope of Max Q PSD' s TC- 1 Composite Lift Off PSD' s TC-1 Composite Max Q PSD' s TC-4 Envelopes of Bus and VLC cg PSD's TC-4 Envelopes of Bus PSD's for Lift Off & Max Q TC-4 Envelopes of VLC cg PSD' s f o r Lift Off & Max Q TC-4 Envelopes of Lift Off PSD' s TC-4 Envelopes of Max Q PSD's TC-4 Composite Lift Off PSD's TC-4 Composite Max Q PSD' s TC-3 Envelopes of Bas and VLC cg PSD' s TC-3 Envelopes of Bus PSD's for Lift Off & Max Q TC-3 Envelopes of VLC cg PSD's fo r Lift Off & Max Q TC-3 Envelopes PSD's for Lift Off TC-3 Envelopes PSD' s for Max Q TC-3 Summaries of Lift Off PSD's TC-3 Summar ies of Max Q PSD's

Page - 2 3 4 5 6 7 9

11 19 27 28 29 30 32 3 4 4 2 50 5 1 5 2 5 3 5 5 57 65

Notations Used in Volume I1

B u s - Major s t r u c t u r a l a s s e m b l y si Viking O r b i t e r - see F i g u r e 3.1

Max Q - Fkriod of launch f l ight of m a x i m u m dyqamic p r e s s u r e .

PSD - 2 P o w e r s p e c t r a l density, vibrat ion, g / H e r t z

VDS - Viking Dynamic Simula tor , TC-1 payload

VLC - Viking Lander Capsule u)

VLCA - Viking Lander Capsule Adapter

VO - Viking Orb i t e r d

VS/C - Viking Spacec ra f t

V-SIC-A- Viking Spacec ra f t Adapter

TC-1 - The Ti tan Centaur Launch Vehicle Number 1

TC-2 - The Ti tan Centaur Launch Vehicle Number 2, Helios Spacec ra f t

TC-3 - The T i t an Centaur Launch Vehicle Number 3, Second Viking Spacecraf t Launch

TC-4 - The Ti tan Centaur Launch Vehicle Number 4, First Viking Spacec ra f t Launch

?

VOLUME 11

VIBRATION PSD OF LAUNCH AND MAX Q FLIGHT DATA

SECTION I

SUMMARY DATA

, . Volume I1 presents Power Spectral Density .analyses of vibration measure- ments made on the spacecraft section of the first , third and fourth launch flights of the Titan Centaur Launch Vehicles. The spacecraft carr ied were the Viking Eynamic Simulator (VDS), and the f i r s t and second Viking Spacecraft. The data i s for two locations on the spacecraft: (1) the center of gravity of the Viking Lander Capsule, and (2) several points on the Viking Orbiter Bus. The Viking Lander Capsule c. g. data was obtained through transformations of adapter s t rain gage measurements and contains data in the 0-40 Hertz frequency band. The Bus data is f rom both crystal and servo accelerometers and provides data in the 0-2000 Hertz range. The Bus i s the pr imary structural assembly of the Viking Orbiter and the data i s more representative of structure response rather than component response. All of the data was telemetered on IRIG Proportional Subcarr ier Bands, however nonstandard filtering was used in playback to enhance the frequency content of the data.

Volume I1 i s contained in four sections.

Section 1 summarizes a l l of the data into composite and envelope PSD plots.

Section 2 contains individual PSD plots and associated time histories f rom the f i r s t launch, carrying the Viking Dynamic Simulator.

Section 3 and 4 contain the individual data f rom the two Viking Spacecraft.

Measurement locations, telemetry channel assignments, filter usage and 'measurement identification notations a r e contained in Sections 2, 3 and 4 with the respective spacecraft.

All of the data processing contained in this report was performed a t the Langley Research Center by the Analysis and Computations Division and their contractors. The computer program used for the PSD is the NASA Langley Signal Analysis Program (Reference 1). The program uses Blackrnan- Tukey- F a s t Fourier Transform techniques.

Reference 1. Keisler, S. R., Langley Signal Analysis Program. NASA CR- (to be published)

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