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Reduction of Turbulent Boundary Layer Noise with Actively Controlled Carbon Fiber Reinforced Plastic Panels

Algermissen, Stephan and Misol, Malte and Unruh, Oliver (2012) Reduction of Turbulent Boundary Layer Noise with Actively Controlled Carbon Fiber Reinforced Plastic Panels. In: Adaptive, Tolerant and Efficient Composite Structures Springer. pp. 417-425. ISBN 978 3 642 29189 0.

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Abstract

The turbulent boundary layer (TBL) is one of the dominant external noise sources in high subsonic aircrafts. Especially in modern aircrafts where common materials for fuselages are currently substituted by carbon-fiber-reinforced-plastics (CFRP), it is essential to avoid a decrease of passenger comfort as a result of an inferior transmission loss of the new materials. To increase the transmission loss of CFRP panels they are equipped with active noise reduction systems. In this paper the results of an experimental study in the aeroacoustic wind tunnel of the German Aerospace Center (DLR) are presented. An active panel excited by a TBL is tested at flow speeds up to Mach 0.16. The CFRP panel (500 x 800 x 2.7 mm^3) is equipped with five piezo-ceramic patch actuators and ten accelerometers. Active structural acoustic control (ASAC) and active vibration control (AVC) are used to reduce the broadband TBL noise transmission in the bandwidth from 1 to 500 Hz. Feedforward and feedback control algorithms are applied in the experiments and show high performance even in presence of plant uncertainties. To improve control results the generalized plant framework of robust control is utilized for global feedback control. Finally, an overview of the achieved results is given.

Document Type:Book Section
Title:Reduction of Turbulent Boundary Layer Noise with Actively Controlled Carbon Fiber Reinforced Plastic Panels
Authors:
AuthorsInstitution or Email of Authors
Algermissen, StephanUNSPECIFIED
Misol, MalteUNSPECIFIED
Unruh, OliverUNSPECIFIED
Date:June 2012
Journal or Publication Title:Adaptive, Tolerant and Efficient Composite Structures
Refereed publication:Yes
In ISI Web of Science:No
Volume:1
Page Range:pp. 417-425
Editors:
EditorsEmail
Wiedemann, MartinUNSPECIFIED
Sinapius, MichaelUNSPECIFIED
Publisher:Springer
ISBN:978 3 642 29189 0
Status:Published
Keywords:Adaptive system, Turbulent boundary layer, active structural acoustic control, noise reduction
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:V SH - Verbesserung der Sicherheit im Verkehr (old)
DLR - Research area:Transport
DLR - Program:V SH - Verbesserung der Sicherheit im Verkehr
DLR - Research theme (Project):V - Aktive Vibrations- und Lärmreduzierung an Fahrzeugen (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems
Deposited By: Silke Stanitzek
Deposited On:17 Jul 2012 07:27
Last Modified:01 Aug 2012 07:38

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