Two-Speed Rotorcraft Research Transmission Power-Loss Associated with the Lubrication and Hydraulic Rotating Feed-Through Design Feature

Stevens, Mark A.; Valco, Mark J.; LaBerge, Kelsen E.

An investigation was completed into the power loss associated with a rotating feed-through (RFT) design feature used to transfer lubrication and a hydraulic control signal from the static reference frame to a rotating reference frame in the NASA GRC two-speed transmission tests conducted in the Variable-Speed Drive Test Rig. The RFT feature, not commercially available, was created specifically for this research project and is integral to all two-speed transmission configurations tested, as well as a variant concept design for a geared variable-speed transmission presented at AHS Forum 71 in 2015. The experimental set-up and results from measurements in the isolated rotating-feed-through (RFT) experiments are presented. Results were used in an overall power loss assessment for a scaled conceptual 1,000 horsepower inline concentric two-speed transmission to support a NASA Revolutionary Vertical Lift Technologies (RVLT) Technical Challenge, demonstrating 50% speed change with less than 2% power loss while maintaining current power-to-weight ratios.

Document ID

20180005227

Acquisition Source

Glenn Research Center

Document Type

Conference Paper

Authors

Date Acquired

September 12, 2018

Publication Date

May 14, 2018

Subject Category

Report/Patent Number

Meeting Information

Meeting: American Helicopter Society (AHS) Forum

Location: Phoenix, AZ

Country: United States

Start Date: May 14, 2018

End Date: May 17, 2018

Sponsors: American Helicopter Society, Inc.

Funding Number(s)

Distribution Limits

Public

Work of the US Gov. Public Use Permitted.

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