THEMIS MISSION PRE-SHIP REVIEW Vibration, Acoustics, & Spin Balance David Pankow University of California - Berkeley MPSR Mech Eng- 1 UCB, Oct 26, 2006
GO FOR LAUNCH ! … now how should I fill this 40 minutes MPSR Mech Eng- 2 UCB, Oct 26, 2006
Overview Topics Overview • 5 -50 Hz Pre-Test of Probe Carrier with Mass Dummies • 5 -50 Hz Test of Probe Carrier Assembly (Flight Probes) • MECO Transient Documentation • Acoustic Test of Probe Carrier Assembly • Spin Balance & Mass Properties of all Probes • PCA Spin Balance Planning for ASO MPSR Mech Eng- 3 UCB, Oct 26, 2006
Vibrations Background Probes were “Well Behaved” • Lateral Axes (X shown) • Most Q’s were < 15 – Probe antenna Q 25 • Thrust Axis (Z) • Q’s were mostly below 10 MPSR Mech Eng- 4 UCB, Oct 26, 2006
Vibrations Background PCA was “Very Lively” • Lateral Axes (X shown) • • Consistent with FEM & CLA Top Probe Q 60 -70 “Twisting” Petals Q 20 -30 “Flapping” Petals Q 20 -30 – • All were Non-Linear Crosstalk 1 st Peaks Input • Thrust Axis (Z) was “Quiet” MPSR Mech Eng- 5 UCB, Oct 26, 2006
Sine Sweep 5 -50 Hz Pre-Test of Probe Carrier with Mass Dummies • Rationale: Not a required test, suggested by GSFC/AETD – Prior PSS Quals all between stiff plates, Petal Flex was a concern – – – Qual PSS was subjected Limit Load Sine Burst, strength should be OK 80 kg Probes lack 50 kg Fuel in PCA test (insufficient loading) Prior FEM indicated Petal “Twist Mode” was worst case X direction PCA shake w/ QM PSS on Probe E Mass Dummy PSS Loading Goal is 125% of FDLC RSS moment • Procs: Thm-mint-proc-049 rev 4; SAI-TM-3068; JPL-144 -D-V-100261 • Test Report: SAI-TM-3068 to GSFC for review • Status: complete • Additional Information – – MPSR Very Good Rehearsal for upcoming PCA test (after 8 tries) Post Test QM PSS Pyro Release & Inspection - OK Mech Eng- 6 UCB, Oct 26, 2006
PCA Sine Sweep 5 -50 Hz Test of Probe Carrier Assembly (Flight Probes) • Rationale: Required by NASA & Boeing – Often considered the “Dress Rehearsal” for Flight • Procs: Thm-mint-proc-049 rev 6; SAI-TM-3075 ; JPL-144 -D-V-100261 • Report: SAI-RPT-788 to GSFC, KSC & Boeing for review • Status: complete • Additional Information follows – Quick Look Results – 1 st MODES: – – PEAK LOADING GOALS: 125% of FDLC PSS RSS moment – MPSR Top-26. 5 Hz ; Petal Twist-31 Hz (pairs); Petal Flap-38 Hz (pairs) (Top) A @ 86%; (Flap) B @ 94%; C @ 93%; (Twist) D @ 99%; E @ 96% Mech Eng- 7 UCB, Oct 26, 2006
PCA Sine Sweep 5 -50 Hz PCA Sweep Lateral Sine Sweeps • Data reflects PCA Behavior • Qtop ~ 60 -70; Qpetals ~ 20 -30 • No probe resonances in this range M+P Controller Tracking MPSR Mech Eng- 8 UCB, Oct 26, 2006
MECO EVENT MECO (main engine cut off) transient documentation GOAL: document previous tests to projected MECO levels • 2 Stage Delta MECO Sine Input: 100 -125 Hz @ 0. 2 g lateral; 0. 5 g axial Opening Comments on Prior Test Data • • Themis PCA showed NO MAJOR RESONANCES in this range Any First Occurrence in our accumulated Test Data should be Adequate Demonstration • Graphic “Quick Look” summary results & table on the subsequent pages • • MPSR All Vibration testing raw “CSV” data is posted at: ftp: //apollo. ssl. berkeley. edu/pub/ME_Archives/Themis_I&T_procedures Mech Eng- 9 UCB, Oct 26, 2006
MECO EVENT MPSR Mech Eng- 10 UCB, Oct 26, 2006
MECO EVENT MPSR Mech Eng- 11 UCB, Oct 26, 2006
MECO EVENT MPSR Mech Eng- 12 UCB, Oct 26, 2006
MECO EVENT STATUS: UCB draft to GSFC & KSC – KSC would like all boxes listed in this table MPSR Mech Eng- 13 UCB, Oct 26, 2006
PCA Acoustics Acoustic Test of Probe Carrier Assembly • Rationale: Required by NASA & Boeing • Procs: Thm-mint-proc-061; SAI-spec-1164; JPL-144 -DA-100000 • Test Report: Thm-mint-rpt-061 to GSFC, KSC & Boeing • Status: complete • Additional Information Follows MPSR Mech Eng- 14 UCB, Oct 26, 2006
PCA Acoustics Tabular Summary of Measured Responses Test Chamber Input MPSR Mech Eng- 15 UCB, Oct 26, 2006
PCA Acoustics Response Plots: Solid – Random Input; Jagged – Acoustics Response MPSR Mech Eng- 16 UCB, Oct 26, 2006
PCA Acoustics SST Grms Response Compared • right: ETU random; 18. 3 in / 42 response • below: P-2 random 4. 43 in / 3. 29 res. • below right: Acoustics 4. 1 res. (P-1) 4. 0 res. (P-5) MPSR Mech Eng- 17 UCB, Oct 26, 2006
PCA Acoustics Boeing provided hardware NTE’s MPSR Mech Eng- 18 UCB, Oct 26, 2006
PCA Acoustics Measured Extreme Peaks in Vibration & Acoustics Testing …from PER MPSR NEW DATA ! Mech Eng- 19 UCB, Oct 26, 2006
Probe Spin Balance & Mass Properties of All Probes • Rationale: Science Rqm’t: CG < 0. 18” ; PA offset < 1 • Procs: Thm-mint-proc-049; SAI-plan-0731; Man. Tech-09 PC-WI 58 Rev. 4 • Reports: ATAC-23 -15 -7628 (Man. Tech); Thm-mint-rpt-049 (UCB) • Status: complete • Additional Information Follows – – MPSR Common Set of Balance Masses & Mass Properties was Adequate FOT will need to Track Fuel Use, as Previously Planned Mech Eng- 20 UCB, Oct 26, 2006
Probe Spin Balance • Mag Boom Simulator Masses Review – Static Balance drives X, Y cg to 0, 0 – Dynamic Balance drives Lateral POIs (Ixz, Iyz) to zero • Find a set of masses that make the MB’s look deployed – All other measured mass properties have to be corrected • Independent Solutions by 3 D CAD & 1 st Principals – Solid Works model used for MB parts fabrication, reviewed by G. Dalton – Excel model assembled a set of point & distributed masses (ftp posted) – – Continued Validation Efforts Mass information checked against Build Logs Locations (dimensions) from Probe CMM data & MB deployment tests Swales agrees with our methods (but can’t vouch for our first hand data) • AXB’s & SPB’s use this same mass & dimension approach – Lateral POI’s are the “new wrinkle” for the Mag Booms. MPSR Mech Eng- 21 UCB, Oct 26, 2006
Probe Spin Balance MPSR Mech Eng- 22 UCB, Oct 26, 2006
Probe Spin Balance On Orbit Spin Axis Uncertainties MPSR Mech Eng- 23 UCB, Oct 26, 2006
ASO Spin Balance PCA Spin Balance Planning • Rationale: Required by Boeing for STAR-48 1 Hz Spin – Static Balance < 0. 05 inch – Dynamic Balance < 1/4 (P. A. offset) • Procs: Thm-mint-proc-067; SAI-plan-0794; ASO-M 0006 rev A • Status: ASO’s proc is long standing, UCB proc in draft form • Additional Information: no identified issues – Adaptor Plate & Balance Mass Kit are both In-house MPSR Mech Eng- 24 UCB, Oct 26, 2006
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