Active Balancing for Lift Fan Drive Shaft

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N68335-04-C-0018
Agency Tracking Number: N032-0738
Amount: $70,000.00
Phase: Phase I
Program: SBIR
Awards Year: 2003
Solitcitation Year: N/A
Solitcitation Topic Code: N/A
Solitcitation Number: N/A
Small Business Information
FOSTER-MILLER TECHNOLOGIES DIVOF FOSTER-
431 New Karner Road, Albany, NY, 12205
Duns: 137357435
Hubzone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Hsiang Chen
 Senior Staff Specialist
 (518) 456-9919
 mchen@fosmiltech.com
Business Contact
 Douglas McCauley
Title: General Manager
Phone: (518) 456-9919
Email: dmccauley@fosmiltech.com
Research Institution
N/A
Abstract
The F-35 VSTOL configuration includes a lift fan driven by a long, slender hollow shaft that operates at high speeds. The shaft spins whenever the aircraft's engine runs, and transmits considerable horsepower when the lift fan is activated. In additionto being a key element in the aircraft's drive train, shaft maintenance will require engine removal. A device that observes and automatically adjusts imbalance in this shaft to eliminate its vibration would result in significant O&M savings. To addressthis need, an on-the-fly, self-adjusting balancing device is proposed that utilizes measured vibration to position shaft-mounted balancing disks to minimize shaft imbalance. This active balancing system will reduce or eliminate drive shaft vibrationscaused by rotational dynamics to preclude undue maintenance of shaft system components. Based on influence coefficient (IC) methods, feasibility of the rotating balance disk concept will be demonstrated in Phase I by experiment. A system will be designedto perform multiplane balancing on a spinning shaft by properly positioning shaft-mounted adjustable weights. A test rig will be built to demonstrate the system in a single balance plane, and initial on-board mechanical and electronic hardware capable ofwithstanding the centrifugal loads without contributing to imbalance will be implemented. Performance of a single-plane balance on the test rig will demonstrate feasibility of the proposed approach.

* information listed above is at the time of submission.

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