In-Situ Rolling Element Bearing Temperature and/or Pressure Measurement

摘要

Two programs have been undertaken to evaluate technologies for noninvasive diagnostic and condition-monitoring sensors to be used in land- and space-based applications, with an emphasis on spacecraft attitude-control wheels. Thin-film deposition and patterning processes have been formulated for the production of thin-film resistive sensors for in-situ measurement of pressure and temperature transients in lubricated contacts. These sensors have been tested in a laboratory-scale rig using both oils and greases with both hydrocarbon and fluorocarbon base oils. A small, low power signal conditioner has been developed to facilitate use of the sensors in non-laboratory environments. The open literature concerning three technologies for remote measurement of lubricant migration and degradation has been reviewed Direct vapor pressure measurement, quartz crystal microbalances, and process residual gas analyzers have been assessed. Of the three, process residual gas analyzers are deemed the most promising for both tasks considered.