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NASA-LLIS-1360
Lessons Learned – Unrestrained Separation Nuts May Damage or Hinder Flight Hardware (2002)
Year: 2003
Abstract: Description of Driving Event:
In a complex rover separation event after a Mars landing, pyrotechnic devices are used to release the Mars Exploration Rover (MER) Warm Electronics Box (WEB) from the lander basepetal. If the separation does not occur, the rover does not release and cannot escape the lander. The WEB design called for each separation nut to be free and un-restrained after release, without considering any possible impact damage. The 8 "sep nuts" on each rover were fired successfully during system test. Each was rapidly expelled from the basepetal to strike a rock protection cup located 7 mm beneath the sep nut.
In testing of both MER1 and MER2, the impact resulted in severe damage to the pyro cables attached to the bottom of the nuts. The pyro cabling was damaged sufficiently to cause multiple shorts to chassis that could have over-stressed the pyro system electronics. Redesign efforts to apply padding to the sep nut backshells were complicated by the configuration of the adjacent hardware.
In a complex rover separation event after a Mars landing, pyrotechnic devices are used to release the Mars Exploration Rover (MER) Warm Electronics Box (WEB) from the lander basepetal. If the separation does not occur, the rover does not release and cannot escape the lander. The WEB design called for each separation nut to be free and un-restrained after release, without considering any possible impact damage. The 8 "sep nuts" on each rover were fired successfully during system test. Each was rapidly expelled from the basepetal to strike a rock protection cup located 7 mm beneath the sep nut.
In testing of both MER1 and MER2, the impact resulted in severe damage to the pyro cables attached to the bottom of the nuts. The pyro cabling was damaged sufficiently to cause multiple shorts to chassis that could have over-stressed the pyro system electronics. Redesign efforts to apply padding to the sep nut backshells were complicated by the configuration of the adjacent hardware.
Subject: ATLO
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T15:11:36Z | |
| date available | 2017-09-04T15:11:36Z | |
| date copyright | 01/01/2003 | |
| date issued | 2003 | |
| identifier other | LUVEQCAAAAAAAAAA.pdf | |
| identifier uri | https://yse.yabesh.ir/std/handle/yse/10048 | |
| description abstract | Description of Driving Event: In a complex rover separation event after a Mars landing, pyrotechnic devices are used to release the Mars Exploration Rover (MER) Warm Electronics Box (WEB) from the lander basepetal. If the separation does not occur, the rover does not release and cannot escape the lander. The WEB design called for each separation nut to be free and un-restrained after release, without considering any possible impact damage. The 8 "sep nuts" on each rover were fired successfully during system test. Each was rapidly expelled from the basepetal to strike a rock protection cup located 7 mm beneath the sep nut. In testing of both MER1 and MER2, the impact resulted in severe damage to the pyro cables attached to the bottom of the nuts. The pyro cabling was damaged sufficiently to cause multiple shorts to chassis that could have over-stressed the pyro system electronics. Redesign efforts to apply padding to the sep nut backshells were complicated by the configuration of the adjacent hardware. | |
| language | English | |
| title | NASA-LLIS-1360 | num |
| title | Lessons Learned – Unrestrained Separation Nuts May Damage or Hinder Flight Hardware (2002) | en |
| type | standard | |
| page | 3 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;2003 | |
| contenttype | fulltext | |
| subject keywords | ATLO | |
| subject keywords | Computer-Aided Design/Manufacturing/Engineering | |
| subject keywords | deployment mechanisms | |
| subject keywords | Energetic Materials - Explosive/Propellant/Pyrotechnic | |
| subject keywords | Flight Equipment | |
| subject keywords | Hardware | |
| subject keywords | Payloads | |
| subject keywords | pyro test | |
| subject keywords | Safety & Mission Assurance | |
| subject keywords | Spacecraft | |
| subject keywords | structural interference | |
| subject keywords | structural modeling | |
| subject keywords | system safety | |
| subject keywords | Test & Verification | |
| subject keywords | Test Article | |
| subject keywords | test induced damage |