CRaTER Pre-Environmental Review (I-PER) Engineering Requirements/Design Updates Bob Goeke September 10-11, 2007.

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Presentation transcript:

CRaTER Pre-Environmental Review (I-PER) Engineering Requirements/Design Updates Bob Goeke September 10-11, 2007

Resource Status

Mechanical Design Changes since CDR Top Cover was redesigned to increase the stiffness of the cover and the E-Box/CRaTER Assembly. The material for the Digital to Analog cable clamp was changed from Teflon to Aluminum. Added a floating nut plate on the telescope to provide mounting location for the Thermal Blanket hardware. Redesigned strain relief for detector mounts

Electrical Design Changes since CDR Reduced analog gain of thin detectors by 3X per science requirement change. Changed internal calibration low rate clock period from 2Hz to 8Hz Added 32-sample averaging to housekeeping data Rebuffered PWM DACs to reduce noise coupling from the digital 5VDC supply Added relay on output of DDC 1553 module Data Design Changes since CDR None

Thermal Design Changes since CDR No changes to design Thermal model was found deficient in June TIM Modeling software was not calculating conduction of e-box walls correctly. Thermal blanket implementation doubled the effective radiating area of the (single layer) telescope aperture. Net result is an increase in temperature gradient from the telescope to the mounting interface.

Electronic Components Thermal-Vacuum test results on Flight Unit internal components Max junction numbers assume +40C instrument reference temperature (hot qual) Component Dissipation Theta JC Case Rise Max. Junction Max. Derate DDC 1553 1100 mw 7.6 C/W 16 C 64 C 110 C Actel FPGA 250 mw 2.0 C/W 17 C 58 C 85 C BAE SRAM 100 mw 11 C/W 10 C 51 C IR converter n/a 2 C 42 C (case) 85 C (case)