Accession Number : ADA262479
Title : Evaluation of an Oil-Debris Monitoring Device for Use in Helicopter Transmissions
Descriptive Note : Technical memo.
Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CENTER
Personal Author(s) : Lewicki, David G ; Blanchette, Donald M
Report Date : Aug 1992
Pagination or Media Count : 20
Abstract : Experimental tests were performed on an OH-58A helicopter main-rotor transmission to evaluate an oil-debris monitoring device (ODMD). The tests were performed in the NASA 500-hp Helicopter Transmission Test Stand. Five endurance tests were run as part of a U.S. Navy/NASA/Army advanced lubricants program. The tests were run at 100-percent design speed, 117-percent design torque, and 121 deg C (250 deg F) oil inlet temperature. Each test lasted between 29 and 122 hr. The oils that were used conformed to MIL-L-23699 and DOD-L-85734 specifications. One test produced a massive sun-gear fatigue failure; another test produced a small spall on one sun-gear tooth; a third test produced a catastrophic planet- bearing cage failure. The ODMD results were compared with oil spectroscopy results. The capability of the ODMD to detect transmission component failures was not demonstrated. Two of the five tests produced large amounts of debris. For these two tests, two separate ODMD sensors failed, possibly because of prolonged exposure to relatively high oil temperatures. One test produced a small amount of debris and was not detected by the ODMD or by oil spectroscopy. In general, the ODMD results matched the oil spectroscopy results. The ODMD results were extremely sensitive to oil temperature and flow rate.... Transmissions (machine elements), Gears, Bearings, Debris, Lubrication systems.
Descriptors : *DEBRIS , *MONITORING , *HELICOPTERS , *BEARINGS , *LUBRICANTS , *GEARS , *TRANSMISSIONS(MECHANICAL) , *BEARING CAGES , TEST AND EVALUATION , VELOCITY , TEMPERATURE , SPECTROSCOPY , SPECIFICATIONS , NAVY , FAILURE , RATES , ENDURANCE(GENERAL) , FLOW RATE , FATIGUE(MECHANICS) , FLOW , ARMY , OILS , ROTORS , LUBRICATION , TORQUE , TEST STANDS
Subject Categories : Helicopters
Logistics, Military Facilities and Supplies
Miscellaneous Detection and Detectors
Distribution Statement : APPROVED FOR PUBLIC RELEASE