BSMIan Pain, UK ATC SPIRE Instrument Intermediate Design Review April 23, 24 2001 RAL 1 Beam...

BSM Ian Pain, UK ATC

SPIRE Instrument Intermediate Design Review April 23, 24 2001 RAL

1

Beam Steering Mirror Sub-SystemIIDR Overview

Ian Pain

UK ATC

Colin Cunningham, System engineer + BSM consultantDavid Henry, Optical Engineer, BSM systems assistBrian Stobie, Electronics/Servo engineerIan Pain, Project Manager + Lead/Mechanical EngineerTom Paul, Mechanical Design EngineerKen Wilson, Project TechnicianGillian Wright Local Co-I + Project ScientistGayle Reynolds Project Assistant



2

Agenda

• BSM Design drivers• The status of the design • Open areas• Development Plan• Qualification• Prototyping testing• Summary



3

15:33:

40AG

R

REV.SP501/Reflect.arm

SURFACE 73

13-Jun-00

60.0 MM

X= 0.000

Y=0.0

00

footprint at 27mm above focal surfacefull range of m4 tilts

Telescope axis

BSM design Drivers• Stability Specification confirmed & achievable

• Flex pivots Power consumption vs. vibration survival

• Launch protection now a baseline– launch damping of motor coils– flex pivot protection sleeves– deployable end stop

• limits chop travel to +/- 1 degree • retract after launch to allow +/- 2.5 degrees motion• no Single point Failure• ensures spectrometer field of view retained

– review following qualification testing



4

• Re-designed for PACS chopper motors• Connectors/Harness and PCAL

incorporated. • Structure interface complete

Design Status

PCALStructure interface

Chop Axis



5

Design status (continued)

• Optical Beam interfaces OK• Baffle concept design achieved

Baffle Beams



6

Design status (continued)

Electronics• Top level design complete

– circuit design complete– Deliveries to LAM - tight, but programme rolling

• ESA procurement requests made– Harness, Thermometers, Connectors specified– BSMe parts - via LAM



7

BSM Wiring

ChopMotor

JiggleMotor

FlexibleLink

ChopSensor

JiggleSensor

DeployableEndstop CONNECTOR

MechanismTem perature

Sensor

PCAL



8

BSM Circuit (10 IC’s, 6 Transistors)



9

Open areas - Design• Motor selection

– Confirm PACS thin or thick motors (torque performance)– Detail Motor packaging & any structural mods– FEA

• Launch Lock – design & analyse. – Trade off study (cost/complexity vs benefits)

• Lucas Flexures – determine required pre-ship tests

• Sensors – instability in test data ID’d. Re-confirm OK.

• Baffle– confirm interfaces (finish, location, shape)– complete design (ATC+RAL)



10

Development Plan



11

Milestone (org) DatePDR (SPIRE) CompleteDelta PDR (SPIRE) CompleteBSM Simulink Model Del'y to LAM (ATC) CompleteBSM Analogue Board Design Del'y to LAM CompletePrototype Design Release CompleteBSM Prototype2 Del'y to LAM (ATC) Jun.01BSM Analogue Board Detailed Design Del'yto LAM (ATC)

Complete

SMEC, BSM Detailed Design Review (SPIRE) Jul.01BSM DM2 Deliver to LAM (ATC) Mar.01WFL Dewar required (ATC) Aug.01DM tests complete (ATC) Mar.02BSM STM delivery to RAL (ATC) Jul.02CQM BSM Del'y to LAM (ATC) Aug.02CQM BSM Del'y to RAL (LAM) Nov.02BSM Design CDR (SPIRE) Apr.03System Design CDR (SPIRE) Apr.03CQM Del'y to ESA (RAL) Jul.03WE Critical Design Review (SPIRE) Jul.03PFM BSM Del'y to LAM (ATC) Oct.03PFM BSM Del'y to RAL (LAM) Nov.03PFM Del'y to ESA (RAL) Oct.04FS BSM Del'y to LAM (ATC) Jan.04FS BSM Del'y to RAL (LAM) Mar.04FS Available to ESA (RAL) Jul.05Launch Jan.07

Activity Start EndPreliminary Design 10 Apr '00 13 Feb '01PDR 26 Jun '00 27 Jun '00Detail Design & Prototypes 10 May '00 27 Aug '01Detailed Design Review (prep) 19 Jun '01 22 Jun '01DM 22 Mar '01 22 Mar '02DM tests complete, indicatedesign concept valid

22 Mar '02 22 Mar '02

STM 04 Feb '02 09 Oct '02confirm QM design loads 09 Oct '02 09 Oct '02QM 22 Jun '01 27 Feb '03QM tests complete, indicateflight design valid

27 Feb '03 27 Feb '03

CQM 04 Feb '02 05 Jun '03Critical Design Review 02 Apr '03 04 Apr '03 PFM 13 Mar '01 20 May '04Deliver FPU PFM to ESA 29 Oct '04 01 Nov '04 FSM 18 Apr '03 13 Dec '04Deliver FPU FSM to ESA 19 Apr '05 21 Apr '05



12

• Single Axis Prototype – motors & sensors

• Two Axis Prototype– cooldown, cross talk,

manufacture

• Development Model (DM) – warm shake tests, cold

performance

• Structural & Thermal Model (STM)

– SPIRE vibration environment

• Qualification Model (QM)– survival & life tests, cold

performance

• Cryogenic Qualification Model (CQM)

– SPIRE system integration & function

• Proto-Flight Model (PFM) – flight hardware

• Flight Spare Model (FSM)– spare

Qualification



13

Qualification issues• STM

– to have flex pivots or be fixed mass?– STM vibration delivery too late to work into QM design/build ‘sensibly’. – Will mitigate by procuring backup (stiffer) flex pivots

• Life tests – Life tests are dominated by ground test (PFM AIV plan TBC needs TBD!)

• 1.25 x(orbit life) + 4x(ground test duration) / accel factor• (1.25 x (4.25x12/6) + (4 x 3) ) / 10= 1.5 months approx.

• Cold Vibration tests v.costly• Long lead items:

– flex pivots (Lucas TRW) …. 4-6 months– motors (via MPIA/Zeiss) …. TBD



14

Prototype Testing• Single axis prototype chopping under closed

loop control. – Motors obtained from PACS via MPIA– Laser measurement device delivered (CDL)– D-Space & Simulink environment established

closed loop control of prototype– working to characterize actual components

and refine control system– alternate (last gasp) prototype delivered (CDL)

• test dewar commissioned – 10-16hr hold time, for prototype tests only– closed cycle cooler dewar will be used for QM



15

Single Axis Prototype

BSM chop axis

PACS motor

Tilt Measurement Device



16

2-Axis Prototype

BSM jiggle frame



17

Prototype Test DataDamping Comparisons

-1500.0000

-1000.0000

-500.0000

0.0000

500.0000

1000.0000

1500.0000

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000

Sample Number

Posi

tion

Short

Open

Decay times: 0.42s, 1.68s

Mirror Posisiton

-2800

-2700

-2600

-2500

-2400

-2300

-2200

-2100

-2000

-19000 200 400 600 800 1000 1200 1400 1600 1800 2000

Sample Number

Posi

tion

X axisMotor Force Constant (N/Amp) vs. Angle

6.38

6.40

6.42

6.44

6.46

6.48

6.50

6.52

6.54

6.56

6.58

-0.006 -0.004 -0.002 0 0.002 0.004 0.006

Angle (Rad)

Kf (N

/A)



21

BSM summary

• Mechanical & Electronic Design in good shape• BSM designed at assembly level + 3D components. • Interfaces defined

– Harness– Structure– Baffle/Optics (concept)– PCAL

• DDR schedule (Jul.01) – tight but achievable– Motor selection tests critical, but in hand– Deployable end stop at space envelope level only.

BSMIan Pain, UK ATC SPIRE Instrument Intermediate Design Review April 23, 24 2001 RAL 1 Beam...

Documents

Transcript of BSMIan Pain, UK ATC SPIRE Instrument Intermediate Design Review April 23, 24 2001 RAL 1 Beam...