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Structural Goals

Structural Goals. The following structural stiffness and strength goals for the launch configuration are recommended for OCE2 and encompass a generic spacecraft and launch vehicle Fundamental Frequency for launch > 35 Hz Based on frequency guidelines associated with component mass of 301 Kg

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Structural Goals

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  1. Structural Goals • The following structural stiffness and strength goals for the launch configuration are recommended for OCE2 and encompass a generic spacecraft and launch vehicle • Fundamental Frequency for launch > 35 Hz • Based on frequency guidelines associated with component mass of 301 Kg • Structural Load Limits • 11.9 g in all axes independently • Conservative level for a payload 301 Kg using generic mass acceleration curve • Required Factors of Safety for Analyses • 1.25 on metallic material yield • 1.4 on metallic material ultimate • 3.0 for glass • Values taken from GEVS

  2. Structural Analysis Recommendations • Since the spacecraft for OCE and launch vehicle have not yet been defined, recommend using the generic stiffness goals and structural loads defined on the Structural Goals page • The design will likely need significant optimization, particularly the cradle assembly and trunnion connection to instrument housing • Detector array structure stiffness should be >50 to reduce risk of coupling to overall instrument modes • On-orbit configuration will also need to be assessed for stiffness and stability due to thermal loads and s/c and self-induced disturbances. • Particular attention should be paid to potential coupling between on-orbit structure modes and the momentum compensator 24.6 Hz rotation rate.

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