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Evaluation program for secondary spacecraft cells: synchronous orbit testing of sealed nickel cadmium cells
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Harkness, J. D. |
| Copyright Year | 1977 |
| Description | Performance data concerning sealed nickel-cadmium cells operating under a synchronous orbit regime are presented. A space satellite maintaining a position over a fixed point on earth as the earth rotates on its axis and revolves about the sun was simulated. Results include: (1) exposure to synchronous orbit testing at a temperature of 40 C yields less than 6 years of life; (2) performance at -20 C presents a low capacity problem; (3) the capacity check, performed at the middle of each show period, provides a temporary red reconditioning effect on the cells in that the end-of-discharge voltages are higher, for approximately 7 to 10 days, following the capacity check than they were 7 to 10 days prior to the capacity check; (4) all the test packs at -20 C and 40 C have either failed or were discontinued because of low capacity; and (5) test packs at temperatures of 0 C and 10 C have delivered the best capacity during life and packs tested at 20 C showed better life capability than packs tested at -20 C and 40 C. |
| File Size | 88208876 |
| Page Count | 519 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19780024608 |
| Archival Resource Key | ark:/13960/t3tt9dq3k |
| Language | English |
| Publisher Date | 1977-06-09 |
| Access Restriction | Open |
| Subject Keyword | Energy Production And Conversion Synchronous Satellites Accelerated Life Tests Satellite Orbits Temperature Effects Performance Prediction Spacecraft Power Supplies Auxiliary Power Sources Nickel Cadmium Batteries Stationary Orbits Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
