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NASA Space Mechanisms Handbook: Lessons Learned Documented
Fusaro, R L. Performer: National Aeronautics and Space Administration, Cleveland, OH. Lewis Rearch Center. Apr 1999. 3p (April 1999)
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The need to improve space mechanism reliability is underscored by a long history of flight failures and anomalies caud by malfunctioning mechanisms on spacecraft and launch vehicles. Some examples of the failures are listed in the table. Mechanism anomalies continue to occur and to be a cau of catastrophic mission failures. Several factors cau problems for space system mechanisms. The space environment produces wide temperature ranges, thermal gradients, and rapid changes in temperature, which can bind the moving parts of mechanisms. Ultraviolet radiation and vacuum cau the properties of many materials to degrade to unacceptable levels or to behave differently in space than on Earth, making it difficult to simulate operation during ground tests. The lack of gravity in space caus mechanisms to operate differently than on the ground. Sometimes the effects of zero gravity can be simulated to some degree in ground testing, such
as by offloading the weight of a deployable appendage. Other effects, such as lubricant migration, cannot be simulated and must be considered in the design. Finally, the launch environment impos vere dynamic loads on mechanisms and can cau structural damage, loon fasteners, and damage delicate surfaces.
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##:Aerospace engineering, System failures, Aborted missions, Handbooks,
Anomalies, Launch vehicles, Gravitational effects, Spacecraft
接受用英语怎么说launching, Malfunctions
##:84B: Space Technology: Extraterrestrial Exploration
####:Text in English. Publicly available Unlimited. CASI.
##:NASA Space Mechanisms Handbook: Lessons Learned Documented
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处女男和天蝎女##:Fusaro, R L
>:Performer: National Aeronautics and Space Administration, Cleveland,OH. Lewis Rearch Center. Apr 1999. 3p.
####:April 1999
渥太华的英文####:1999
###:1999
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