lecture24 - ECE2984 Lecture24:SPACEMISSIONDESIGN...

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ECE 2984 Lecture 24: SPACE MISSION DESIGN Joseph Baker (ECE Dept) ECE 2984: Exploration of Space Lecture 24: Space Mission Design
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Last Lecture LAST LECTURE: Satellite Based Communications: Basic Principles Applications THIS LECTURE: Space Mission Design: esign rinciples Design Principles Scoping the mission Joseph Baker (ECE Dept) ECE 2984: Exploration of Space Lecture 24: Space Mission Design Requirements, cost,risk and tradestudies
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Space Mission Design Joseph Baker (ECE Dept) ECE 2984: Exploration of Space Lecture 24: Space Mission Design
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The Genesis Mishap T h eN A S AG e n e s i sm i s s i o ni sa cautionary tale of what can go wrong when good systems engineering practices are not adequately followed. The mission was designed to collect so larw indpart ic lesandreturnthemto t h li Earth for analysis. During re entry on September 8, 2004, the parachutes failed to deploy and the spacecraft plunged into the Utah desert at 200 mph and broke apart. Joseph Baker (ECE Dept) ECE 2984: Exploration of Space Lecture 24: Space Mission Design What went wrong?
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Switches Reversed Acceleration Vector Required for G-Switch to Function Heat Actual Aerodynamic Braking orce shield Force Direction Switches Reversed! were Joseph Baker (ECE Dept) ECE 2984: Exploration of Space Lecture 24: Space Mission Design The parachute deployment failed because two switches were reversed
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The Genesis Mishap A Review Panel determined: arachute eployment iled ecause o itches ere Parachute deployment failed because two switches were installed in reversed directions However, the switch orientation was consistent with the design The flawed design was transcribed from another mission The failure to detect the flaw was attributed to: Verification requirements were not clear Inadequate testing (open/closed functionality only) Design reviews lacked depth Inappropriate confidence in heritage designs roper dherence od stems ngineering ractices ould Joseph Baker (ECE Dept) ECE 2984: Exploration of Space Lecture 24: Space Mission Design Proper adherence to good systems engineering practices would have caught the error prior to launch, if followed.
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Heritage Rule Modification Heritage Rule (1.11): All use of heritage flight hardware shall be fully qualified and verified for use in its new application. This alifi ation all ke to nsideration e essar qualification shall take into consideration necessary design modifications, changes to expected environments, and differences in operational use. New Heritage Rule: o ot ualify y milarity se e aditional Do not qualify by similarity use the traditional verification methods of test, analysis, inspection, and demonstration instead of similarity.
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lecture24 - ECE2984 Lecture24:SPACEMISSIONDESIGN...

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