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Test Facility Simulation Results for Aerospace Loss-of-Lubrication of Spur GearsPrior to receiving airworthiness certification, extensive testing is required during the development of rotary wing aircraft drive systems. Many of these tests are conducted to demonstrate the drive system's ability to operate at extreme conditions, beyond that called for in the normal to maximum power operating range. One of the most extreme tests is referred to as the loss-of-lubrication or run dry test. During this test, the drive system is expected to last at least 30 min without failure while the primary lubrication system is disabled for predetermined, scripted flight conditions. Failure of this test can lead to a partial redesign of the drive system or the addition of an emergency lubrication system. Either of these solutions can greatly increase the aircraft drive system cost and weight and extend the schedule for obtaining airworthiness certification. Recent work at NASA Glenn Research Center focused on performing tests, in a relevant aerospace environment, to simulate the behavior of spur gears under loss-of-lubrication conditions. Tests were conducted using a test facility that was used in the past for spur gear contact fatigue testing. A loss-oflubrication test is initiated by shutting off the single into mesh lubricating jet. The test proceeds until the gears fail and can no longer deliver the applied torque. The observed failures are typically plastically deformed gear teeth, due to the high tooth temperatures, that are no longer in mesh. The effect of several different variables to gear tooth condition during loss-of-lubrication have been tested such as gear pitch, materials, shrouding, lubrication condition, and emergency supplied mist lubrication in earlier testing at NASA. Recent testing has focused on newer aerospace gear steels and imbedding thermocouples in the shrouding to measure the air-oil temperatures flung off the gear teeth. Along with the instrumented shrouding, an instrumented spur gear was also tested. The instrumented spur gear had five thermocouples installed at different locations on the gear tooth and web. The data from these two types of measurements provided important information as to the thermal environment during the loss-of-lubrication event. This data is necessary to validate on-going modeling efforts.
Document ID
20140017465
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Authors
Handschuh, Robert F.
(NASA Glenn Research Center Cleveland, OH United States)
Gargano, Lucas J.
(Ohio State Univ. Cleveland, OH, United States)
Date Acquired
December 17, 2014
Publication Date
October 1, 2014
Subject Category
Aircraft Propulsion And Power
Mechanical Engineering
Report/Patent Number
NASA/TM-2014-218396
E-18976
GRC-E-DAA-TN15087
Funding Number(s)
WBS: WBS 380046.02.03.02.02.01
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
Gears
Mechanical Components
Lubrication
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