BepiColombo/MMO: PWI/WPT-S PWI Kanazawa Meeting [Mar 2006] WPT-S MEFISTO-S [WPT: Team members] Lead...
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Transcript of BepiColombo/MMO: PWI/WPT-S PWI Kanazawa Meeting [Mar 2006] WPT-S MEFISTO-S [WPT: Team members] Lead...
BepiColombo/MMO: PWI/WPT-SPWI Kanazawa Meeting [Mar 2006]
WPT-S
WPT-S
MEFISTO-S
MEFISTO-S
[WPT: Team members]
Lead Co-I Y. Kasaba (JAXA) Manufacturer NIPPI
[PWI] K. Ishisaka, T. Okada (Toyama Pref. U.) A. Matsuoka, T. Abe (JAXA) L. Blomberg (KTH [MEFISTO]) M. Moncuquet (LESIA [SORBET])
[System] K. Komatsu, Y. Morita (JAXA)
With the aide of PWI team members & MMO system members
[WPT: Team members]
Lead Co-I Y. Kasaba (JAXA) Manufacturer NIPPI
[PWI] K. Ishisaka, T. Okada (Toyama Pref. U.) A. Matsuoka, T. Abe (JAXA) L. Blomberg (KTH [MEFISTO]) M. Moncuquet (LESIA [SORBET])
[System] K. Komatsu, Y. Morita (JAXA)
With the aide of PWI team members & MMO system members
WPT-S 15m x 2MEFISTO 15m x 2
PWI/WPT (Wire Probe anTenna)PWI/WPT (Wire Probe anTenna)
BepiColombo/MMO: PWI/WPT-SPWI Kanazawa Meeting [Mar 2006]PWI/WPT (Wire Probe anTenna)PWI/WPT (Wire Probe anTenna)
Mechanical – past Design *Vertical *Latch release: wire cutter with Pyro *After the release: Stopped by the tension between “wire” & “spring in Holder” *Plane-gear mechanism
BepiColombo/MMO: PWI/WPT-SPWI Kanazawa Meeting [Mar 2006](1) Progress from the last design meeting (Sep. 2005)
<<<Mechanical>>>*Overall Design: 3 changes - “Horizontal”: reduce the sun-lit part - Latch: released by “motor, without Pyro” - Addition of “spacer”
*Mass reduction study: failed O Plane-gear 600g at this moment ? Worm-gear 630g (structure: -15g, gear : -30g, motor: +75g )
A/I: - “Light-weight motor” – Torque requirement is Margine = x4 at Retraction in full-extension [Heritage of MAST design]- Reduction of the required torque: *reduction of torque margine? *reduction of spin rate at the full extension?
[depending on initial centrifugal force & attitude stability of the spacecraft]
*refine of the requested retraction
BepiColombo/MMO: PWI/WPT-SPWI Kanazawa Meeting [Mar 2006](1) Progress from the last design meeting (Sep. 2005)
<<<Mechanica>>>*Test of the Latch mechanism
Static load test: OK for “<53G”
A/I : Dynamic load test(based on the issued tentative environment condition)
*Wire: Thermal-shock test – No problem
A/I : Strength test @ high temperature Establishment of the contact to the sphere Def. of I/F & Installation to the spacectaft
Load direction
BepiColombo/MMO: PWI/WPT-SPWI Kanazawa Meeting [Mar 2006](1) Progress from the last design meeting (Sep. 2005)
<<<Thermal>>>*MTM It is not updated after September 2005
A/I: Update of MTM > Definition of I/F to Side/Lower panels> Update of I-ICD & CDD
<<<Electrical>>>*Harness/Connector: Trough-hole at the lower deck
Connector & harness at the “top-panel” of WPT-SA/I : Def. of “Stepping motor” (incl. torque margine, mass, EMC)
<DC motor requires safety measure for over-current.>
<<<Material [with MEFISTO]>>>*Surface sample: Photo-electron / 2nd electron yield will be measured.
A/I: next week – Photo-electron distributionFuture – Amount of Photo-electron / 2nd electron yield
<<<Numerical evaluation>>>*Attitude analyses: Preliminary analyses is “OK”. A/I: incl. Despun & non-symmetric extension
BepiColombo/MMO: PWI/WPT-SPWI Kanazawa Meeting [Mar 2006](3) Development plan in 2006
<Mechanical> Establishment of “key parts design”Finish of the Environment test of BBM & MaterialsUpdating (& reduction) of Mass
<Termal> Update of MTM, Establishment of the wire strength in High-T
<Elec.> Establishment (& reduction) of Monitor items[= establishment of MAST/WPT-E]
Establishment of the Motor power production from 50V-bus[= establishment of MAST/WPT-E]
Establishment of the control scheme at the extension[= establishment of basic design of software on MDP]
(5) Major request to System / Other subsystems & payloads<Mechanical> Definition of I/F
Definition of safety requirement (torque margin, strength margin)Purging for MoS2???
<System> Spin axis direction, Reduction of surface charging
Appendix. Current Resources<Mass> (without margin)
*Assigned mass 545g (without margin)*Current design 600g
BepiColombo/MMO: PWI/WPT-SPWI Kanazawa Meeting [Mar 2006]
“+-4mm move”might be expected.