Author: Publisher:
ISBN:
Category : Atmosphere, Upper
Languages : en
Pages : 10
Book Description
NASA's Upper Atmosphere Research Satellite
Author: UARS
Author: UARS
Author: Publisher:
ISBN:
Category : Artificial satellites
Languages : en
Pages : 32
Book Description
NASA's Upper Atmosphere Research Satellite (UARS) program, its goals and objectives are described. Also included are its significance to upper atmosphere science, the experimental and theoretical investigations that comprise it, and the compelling issues of global change, driven by human activities, that led NASA to plan and implement it.
Upper Atmosphere Research Satellite
Author: The Upper Atmosphere Research Satellite In-Flight Dynamics... NASA-TM-110325... Jul. 15, 1997
Author: The Upper Atmosphere
Author: John Clifford BirdPublisher:
ISBN:
Category : Astronautics in meteorology
Languages : en
Pages : 60
Book Description
NASA Upper Atmosphere Research Program
Author: Publisher:
ISBN:
Category : Atmospheric chemistry
Languages : en
Pages : 576
Book Description
The Upper Atmosphere Research Satellite In-Flight Dynamics
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781723453878
Category :
Languages : en
Pages : 104
Book Description
Upper Atmosphere Research Satellite flight data from the first 737 days after launch (September 1991) was used to investigate spacecraft disturbances and responses. The investigation included two in-flight dynamics experiments (approximately three orbits each). Orbital and configuration influences on spacecraft dynamic response were also examined. Orbital influences were due to temperature variation from crossing the Earth's terminator and variation of the solar incident energy as the orbit precessed. During the terminator crossing, the rapid ambient temperature change caused the spacecraft's two flexible appendages to experience thermal elastic bending (thermal snap). The resulting response was dependent upon the orientation of the solar array and the solar incident energy. Orbital influences were also caused by on-board and environmental disturbances and spacecraft configuration changes resulting in dynamic responses which were repeated each orbit. Configuration influences were due to solar array rotation changing spacecraft modal properties. The investigation quantified the spacecraft dynamic response produced by the solar array and high gain antenna harmonic drive disturbances. The solar array's harmonic drive output resonated two solar array modes. Friction in the solar array gear drive provided sufficient energy dissipation which prevented the solar panels from resonating catastrophically; however, the solar array vibration amplitude was excessively large. The resulting vibration had a latitude-specific pattern. Woodard, Stanley E. Langley Research Center UPPER ATMOSPHERE RESEARCH SATELLITE (UARS); DYNAMIC RESPONSE; SPACECRAFT CONFIGURATIONS; SOLAR ARRAYS; VIBRATION EFFECTS; SPACECRAFT ORBITS; SOLAR ENERGY; ELASTIC BENDING; TEMPERATURE EFFECTS; ANTENNA COMPONENTS; FRICTION; ENERGY DISSIPATION; SATELLITE ATTITUDE CONTROL; ORBITAL MECHANICS; APPENDAGES; ROTATION; MECHANICAL DRIVES...
NASA Facts
Author: UARS
Author: Publisher:
ISBN:
Category : Artificial satellites in remote sensing
Languages : en
Pages : 6
Book Description