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Tunnel-in-the-Sky Display for Segment-Wise Measurement of Helicopter Noise in Repetitive Approaches

Gursky, Bianca I. and Olsman, W. F. Jurrien (2014) Tunnel-in-the-Sky Display for Segment-Wise Measurement of Helicopter Noise in Repetitive Approaches. In: Greener Aviation 2014. Greener Aviation 2014, 12.-14. März 2014, Brüssel, Belgien.

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Noise emission is a limiting factor for helicopter operations. Additional to new helicopter designs, optimized flight procedures can reduce the noise level perceived on the ground. The advantage is that optimized procedures can make approaches with already existing helicopter types quieter with no engineering effort. The German Aerospace Center (DLR) has gained experience in optimizing noise abatement procedures during projects such as PAVE and Friendcopter. This research is continued under the funding of JTI Clean Sky GRC5. DLR’s computational chain SELENE is used for optimizing helicopter approaches. The outcome of this tool is a three-dimensional approach path with prescribed velocity profile. Noise critical flight parameters such as pitch angle and rotor torque can also be optimized. In order to measure the noise footprint of an approach usually a large area along the approach direction is equipped with microphones. In order to reduce the operational effort of setting up and monitoring the equipment, a different measurement method was selected for the current flight test campaign. Fewer microphones are placed in a smaller area, preferably inside the controlled area of an airport. In order to measure the full length of the optimized procedure, the helicopter flies the approach multiple times with shifted landing points. For this measurement method the pilot must fly the same procedure repeatedly with high accuracy while following the noise critical target parameters. It is of utmost importance to provide the pilot with appropriate guidance to fulfil this task. For this purpose a tunnel-in-the-sky guidance display was developed for usage in DLR’s research helicopter ACT/FHS of type EC135. It allows the pilot to intuitively understand the geometrical evolvement of the flight path. At the same time the overlaid primary flight display gives information about target airspeed, pitch angle and rotor torque. The display as well as the measurement method have been tested in first flight trials where a reference procedure has been evaluated. They have proven their applicability and will be used for future noise abatement flight test campaigns.

Item URL in elib:https://elib.dlr.de/88532/
Document Type:Conference or Workshop Item (Speech)
Title:Tunnel-in-the-Sky Display for Segment-Wise Measurement of Helicopter Noise in Repetitive Approaches
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Gursky, Bianca I.Bianca.Gursky (at) dlr.deUNSPECIFIED
Olsman, W. F. Jurrienjurrien.olsman (at) dlr.deUNSPECIFIED
Date:12 March 2014
Journal or Publication Title:Greener Aviation 2014
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:tunnel-in-the-sky display, helicopter, noise abatement, noise footprint measurement
Event Title:Greener Aviation 2014
Event Location:Brüssel, Belgien
Event Type:international Conference
Event Dates:12.-14. März 2014
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Rotorcraft (old)
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Quiet and Comfortable Rotorcraft (old)
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Institute of Flight Systems > Rotorcraft
Deposited By: Schuchardt, Dr.-Ing. Bianca Isabella
Deposited On:20 Mar 2014 16:22
Last Modified:17 Oct 2014 14:27

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