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Active Control of Low-Speed Fan Tonal Noise Using Actuators Mounted in Stator Vanes: Part III ResultsA test program to demonstrate simplification of Active Noise Control (ANC) systems relative to standard techniques was performed on the NASA Glenn Active Noise Control Fan from May through September 2001. The target mode was the m = 2 circumferential mode generated by the rotor-stator interaction at 2BPF. Seven radials (combined inlet and exhaust) were present at this condition. Several different error-sensing strategies were implemented. Integration of the error-sensors with passive treatment was investigated. These were: (i) an in-duct linear axial array, (ii) an induct steering array, (iii) a pylon-mounted array, and (iv) a near-field boom array. The effect of incorporating passive treatment was investigated as well as reducing the actuator count. These simplified systems were compared to a fully ANC specified system. Modal data acquired using the Rotating Rake are presented for a range of corrected fan rpm. Simplified control has been demonstrated to be possible but requires a well-known and dominant mode signature. The documented results here in are part III of a three-part series of reports with the same base title. Part I and II document the control system and error-sensing design and implementation.
Document ID
20150012259
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Sutliff, Daniel L. (Sest, Inc. Cleveland, OH, United States)
Remington, Paul J. (BBN Technologies Cambridge, MA, United States)
Walker, Bruce E. (Hersh Walker Acoustics Westlake Village, CA, United States)
Date Acquired
July 2, 2015
Publication Date
March 1, 2003
Subject Category
Research And Support Facilities (Air)
Acoustics
Aircraft Propulsion And Power
Report/Patent Number
E-13919
Meeting Information
Meeting: AIAA/CEAS Aeroacoustics Conference
Location: Hilton Head, SC
Country: United States
Start Date: May 12, 2003
End Date: May 14, 2003
Sponsors: American Inst. of Aeronautics and Astronautics, Confederation of European Aerospace Societies
Funding Number(s)
CONTRACT_GRANT: NAS1-99059
TASK: YOQ3586
WBS: WBS 22.781.30.12
CONTRACT_GRANT: NAS1-99060
Distribution Limits
Public
Copyright
Public Use Permitted.

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