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PFP Mechanical Peer Review Mechanical Design Requirements. Paul Turin, LME 2010 May 10. PFP Environments. Environmental Limits. Zone 1. Zone 1. Zone 2. Circled items – We’ve suggested zone changes. Random Vibe. Factor of Safety. ERD table 23. Instrument Design Loads.

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PFP Mechanical Peer Review Mechanical Design Requirements


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PFP Mechanical Peer Review

Mechanical Design Requirements

Paul Turin, LME

2010 May 10

environmental limits
Environmental Limits

Zone 1

Zone 1

Zone 2

Circled items – We’ve suggested zone changes

factor of safety
Factor of Safety

ERD table 23

instrument design loads
Instrument Design Loads

Margin of Safety shall be positive (ERD 4.1.6):

Design to worst of either case 1 or 2 and case 3:

instrument design loads3
Instrument Design Loads
  • Any significant Qs in instrument need to be accounted for
  • Loads should come down with 1st CLA results, currently expected Nov ’10 -- Mar ’11
  • Probably too late for ETU testing (if performed, TBD)
misc reqm ts from erd
Misc reqm’ts from ERD
  • Acoustics for STATIC only, due to carbon foils (ERD 3.4.3)
  • Pressure Profile – we use GSFC rule of thumb of 1in2/ft3 (ERD 3.4.4)
    • Pending OK by LM
  • Aerothermal heating 0.1W/cm2 for 10 min duration max (ERD 3.5.3)
  • Mechanisms tested to 2x # flight cycles (ERD 4.2.5.1)
  • Natural Freq>100Hz or structural test required (ERD 4.2.5.2)
  • Self Shock: Instruments with deployables perform self-shock two times, preferably initiated by Orbiter circuits (post integration)(ERD 4.2.5.5.1,2)