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Helicopter Noise Reduction by Individual Blade Control (IBC) - Selected Flight Test and Simulation Results -

Splettstößer, W.R. and Schultz, K.-J. and van der Wall, Berend G. and Buchholz, H. and Gembler, W. and Niesl, G. (2000) Helicopter Noise Reduction by Individual Blade Control (IBC) - Selected Flight Test and Simulation Results -. RTO/AVT Symposium on "Active Control Technology for Enhanced Performance Operational Capabilities of Military Aircraft, Land Vehicles and Sea Vehicles", Braunschweig, 8-11 May 2000.

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Abstract

A collaborative flight test programme was conducted to study among other objectives the potential of open-loop Individual Blade Pitch Control (IBC) to reduce the external noise of a helicopter in partial power decent, a flight regime known to generate the highly annoying Blade-Vortex Interaction (BVI) impulsive noise. The blade root control system employing actuators in the rotating frame, was installed on a BO 105 helicopter, which was flown over an extended linear microphone array. The acoustic measurements on the ground were synchronized to the flight track and rotor performance measurements supplemented by limited simultaneously acquired on-board acoustic and blade surface pressure data. Selected test results quantifying the noise reduction potential of the IBC technique, are presented and compared to numerical rotor simulation results calculated by the aeromechanic S4 code and the acoustic AKUROT code of the DLR. A significant noise reduction benefit (exceeding 5 dB) of the maximum A-weighted (BVI) noise level was obtained for the 2/rev IBC mode; further, over a wide range of IBC phase angles simultaneous noise and vibration reductions were observed. The complete data base acquired will contribute to the development and validation of a fast control algorithm for closed-loop IBC applications.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=2000,
Title:Helicopter Noise Reduction by Individual Blade Control (IBC) - Selected Flight Test and Simulation Results -
Authors:
AuthorsInstitution or Email of Authors
Splettstößer, W.R.UNSPECIFIED
Schultz, K.-J.UNSPECIFIED
van der Wall, Berend G.Institut für Flugsystemtechnik
Buchholz, H.Institut für Flugsystemtechnik
Gembler, W.Eurocopter Deutschland
Niesl, G.Eurocopter Deutschland
Date:2000
Status:Published
Keywords:helicopter noise reduction, Individual Blade Control (IBC), IBC flight tests, BVI noise simulation
Event Title:RTO/AVT Symposium on "Active Control Technology for Enhanced Performance Operational Capabilities of Military Aircraft, Land Vehicles and Sea Vehicles", Braunschweig, 8-11 May 2000
Organizer:RTO
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Rotorcraft
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Active Rotorcraft (old)
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Institut für Entwurfsaerodynamik
Institute of Flight Systems
Deposited By: elib DLR-Beauftragter
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 20:10

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