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A vibration absorber with variable eigenfrequency for turboprop aircraft

Keye, Stefan and Keimer, Ralf and Homann, Stefan (2009) A vibration absorber with variable eigenfrequency for turboprop aircraft. Aerospace Science and Technology, 13 (4-5), pp. 165-171. Elsevier. doi: 10.1016/j.ast.2008.10.001. ISSN 1270-9638.

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Typical turboprop noise spectra exhibit a series of characteristic peaks which are directly related to the product of propeller rpm and number of propeller blades. These blade passage frequencies contribute significantly to the overall sound pressure level both outside and inside the aircraft. Their contribution to cabin noise is usually reduced by appropriately adjusted mass dampers. However, since the engine rpm varies for different flight stages, any fixed eigenfrequency absorber will merely be a sub-optimal compromise. The Tunable Vibration Absorber (TVA) introduced in this article has a variable resonant frequency which enables an adaptation to different flight phases providing largely improved performance. Frequency tuning is achieved through a piezo-electric stack actuator, which applies a pressure force to a pair of leaf springs thus reducing their effective bending stiffness. Among the main advantages of this particular approach are a static control signal and low power consumption. To enable a light-weight construction the components which generate the pressure loading are incorporated into the oscillating mass. The TVA allows to cover a wide frequency range using only a single device. Additionally, it features damping control capability and optional active multi-mode operation. Structural-acoustic simulations have indicated a noise reduction potential of approximately 10 dB. This article gives a short overview of different tuneable vibration absorber concepts, lines out the theoretical background of the proposed approach, discusses the general components layout and describes the experimental verification of a prototype TVA for the Airbus A400M.

Item URL in elib:https://elib.dlr.de/68889/
Document Type:Article
Title:A vibration absorber with variable eigenfrequency for turboprop aircraft
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Keye, StefanDLR, Institute for Aerodynamics and Flow TechnologyUNSPECIFIEDUNSPECIFIED
Homann, StefanHauni Maschinenbau AG, Kurt-A.-Körber-Chaussee 8-32, D-21033 Hamburg, GermanyUNSPECIFIEDUNSPECIFIED
Date:July 2009
Journal or Publication Title:Aerospace Science and Technology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 165-171
Keywords:Mass damper; Vibration absorber; Tuneability
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures & Materials (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Adaptronics
Deposited By: Ries, Doris
Deposited On:08 Feb 2011 09:27
Last Modified:07 Feb 2013 20:26

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