LARGE RETRACTABLE SOLAR CELL ARRAY.
Abstract
The main activity consisted of preparation of program documentation and procedures for orderly program control, and the definition of the baseline design by completion of major trade-off studies and analyses. The R and D Technical Plan, Milestone Forecast, Preliminary Interface Specifications, Quality Plan, Trouble and Failure Reporting Plans, Approved Materials and Processes List, and the Equipment Log Procedure have been accomplished. The trade-off studies and analyses led to the establishment of a baseline design using frameless pancake dc torquers and tachometers with dry, self-lubricating brushes for array orientation. The array consists of two 177.5- by 67.10-inch panels composed of 1-mil Kapton and 1-mil fiberglass. An 8-inch diameter drum constructed of magnesium with aluminum sandwich end plates is employed for panel stowage. Mounted proximate to the drum end plates are the boom casettes, each housing two 0.86-inch diameter booms. Two booms extend the panel one side of the drum, with the other pair extending the second panel from the other side. All four booms are driven by a single ac motor. A boom length compensator mechanism eliminates a potential boom synchronization problem. Primary power is generated by approximately 17,000 12-mil N/P silicon solar cells with 6-mil cover slides. Launch and eclipse power is provided by two rechareable 6 amp-hr nickel-cadmium batteries. The bus consists of 0.7-mil copper with 0.5-mil Kapton insulation. Slip rings are used for power and signal transfer between rotating interfaces. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1968
- Accession Number
- AD0841060
Entities
People
- Edward O. Felkel
- George Wolff
Organizations
- Hughes Aircraft Company