1 / 21

SPP Fields Antenna TRL6 Review Pre-PDR Mechanical Design

SPP Fields Antenna TRL6 Review Pre-PDR Mechanical Design. Jeremy McCauley SSL UCB 7/18/2013. Current Configuration: SPP Spacecraft 4-11-13 FIELDS <05>, SPP-ANT-MEC-000 Antenna Assy <27>. TRL6 Development. Stowed along SC for Launch Support at ends and midspan Angled to fit on panels

shiloh
Download Presentation

SPP Fields Antenna TRL6 Review Pre-PDR Mechanical Design

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. SPP Fields AntennaTRL6 ReviewPre-PDR Mechanical Design Jeremy McCauley SSL UCB 7/18/2013 Current Configuration: SPP Spacecraft 4-11-13 FIELDS <05>, SPP-ANT-MEC-000 Antenna Assy <27>

  2. TRL6 Development • Stowed along SC for Launch • Support at ends and midspan • Angled to fit on panels • TRL6 Development Tasks • Verify dynamic response

  3. Whip Vibe • Restrained as designed: • One end fixed, mid point clamped, end fork • Bent to match Stowed configuration • First Resonant Frequency: 6 to 10 Hz • No permanent deformations or distortions

  4. Backup Slides Current Configuration: SPP Spacecraft 4-11-13 FIELDS <05>, SPP-ANT-MEC-000 Antenna Assy <27>

  5. Agenda • TRL6 Development Tasks • Mechanical Design • Thermal Design • BB Tests

  6. Design Concept • Equal exposed length • Coplanar with TPS • Greatest length, greatest separation • Stowed along SC for Launch • Preamp located as close to ANT as possible

  7. Design Development • Hinge • Similar to THEMIS FGB designed at SSL • Behind TPS at ordinary flight environments • Mounting accomodation worked with APL

  8. Design Development • Outboard Segment • Exposed to intense sunlight • Shield and Isolate to provide quick thermal cooling

  9. Thermal Design Concept Thermal Choke • Hinge and Preamp Behind TPS • Whip >1300 C • Thermal Choke • Shield for Stub • Shield from TPS • Radiator for Preamp TPS

  10. Thermal Design Concept • Sapphire Isolators on Whip, Stub and Shield • (APL Data) • Alumina inside Stub • FR4 or similar all other places • Titanium Mounting Foot  Model

  11. BB Testing • Thermal Isolators and Shield • PROMES • SAO • GSFC • Whip Vibe • FWB • Hinge and Stub Cage

  12. Thermal Choke TTM Whip Disk Whip Choke Choke Water Cooling

  13. TTM Choke Thermal Results • Thermal Balance

  14. Thermal Shield TTM Shield Clamp Bracket Water Cooled Stub

  15. TTM Shield Thermal Results • Thermal Balance

  16. TTM Shield Lessons Learned • Re-crystalization of Titanium • Has no observed effect on bracket • Melting of silver coating on bolts • Might create gaps on joints • Rapid heating • Probably deformed shield

  17. Thermal Distortion Testing • 28 inch sample • ~10 inch heated section • Monitor motion of tip • Max deflection ~0.06” • Larger than desired

  18. Thermal Design Conclusions • Niobium good for temperatures • Distortion to be characterized before PDR • Thermal Choke works • Shield for Stub gives sufficient isolation • A286 Screws • No Silver • To be verified with static furnace test over the next month

  19. Whip Vibe Anomaly • End Bent at Fork • No contact from personnel observed • Transverse to fork when found • Most likely due to fixture during resonant case • First Y-axis random • Ejected test article • Test rerun for verification

  20. FWB and Hinge Testing • Testing FWB for torque over temperature range • Second Generation • Ambient Torque Testing verified function as desired • Testing Hinge Form and Function • Already TRL6 due to previous Flight Designs

  21. TRL6 Conclusions • Materials • a/e data complete • Insulators chosen • Thermal response • Choke, shield work • Screw material in final test • Tube distortion in testing • SAO Beam testing next month • 2 (later 6) beams • Dynamic response TRL6 by PDR

More Related