Friction, wear and noise of slip ring and brush contacts for synchronous satellite use.A program is being conducted for testing of slip rings for synchronous orbit application. Instrumentation systems necessary for monitoring electrical noise, friction, and brush wear at atmospheric pressure and at less than 50 ntorr have been developed. A multiplex scheme necessary for the simultaneous recording of brush displacement, friction, and electrical noise has also been developed. Composite brushes consisting of silver-molybdenum disulfide-graphite and silver-niobium diselenide-graphite have been employed on rings of coin silver and rhodium plate. Four contact combinations have been tested during an ambient condition run-in at 150 rpm and a humidity sequence at 0.1 rpm. The first six months of the two year vacuum test at 0.1 rpm have been completed. Electrical noise, friction and brush wear data recorded during these periods have been analyzed.
Document ID
19720052316
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Lewis, N. E.
Cole, S. R.
Glossbrenner, E. W. (Litton Industries, Inc. Poly-Scientific Div., Blacksburg, Va., United States)
Vest, C. E. (NASA Goddard Space Flight Center Greenbelt, Md., United States)