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Numerical investigation towards the control of flexural waves using structural intensity for an active barrier of structure-borne sound

Kokott, Alexander and Haase, Thomas and Monner, Hans Peter (2020) Numerical investigation towards the control of flexural waves using structural intensity for an active barrier of structure-borne sound. In: Active and Passive Smart Structures and Integrated Systems IX 2020, 11376. SPIE - The International Society for Optical Engineering. SPIE Smart Structures and NDE 2020, 27. Apr. - 01. Mai 2020, Anaheim, CA, USA. doi: 10.1117/12.2558100. ISBN 978-1-5106-3530-2. ISSN 0277-786X.

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Official URL: https://www.spiedigitallibrary.org/conference-proceedings-of-spie/11376/2558100/Numerical-investigation-towards-the-control-of-flexural-waves-using-structural/10.1117/12.2558100.full?SSO=1


Noise is often generated in different parts of a structure than where it is perceived, e.g. cabin noise caused by engine or APU of aircraft. Passive materials can reduce noise, but are mainly effective in a higher frequency range and require additional mass. Active systems in turn address low frequency noise, targeting different measures (sound pressure, vibration velocity, radiated sound power). Another approach is the focus on structural intensity (SI), i.e. transmitted power per unit area. Hereby, an active barrier for structure-borne sound can attenuate the downstream structure and avoid noise emission. Therefore, a real-time measurement of SI is crucial. It can be estimated using accelerometer arrays with different levels of simplifications. The presented numerical study assesses these methods, addressing the actuator and error sensor placement on a plate structure. A linear feed-forward filter is implemented, hence the SI it is split into its linearly dependent components. The necessary amount of control forces and virtual error sensors is assessed, with respect to dependencies on wavelength and the type of SI components. The study shows an advantage of SI control compared to a conventional velocity control. A small number of error sensor positions and actuators can achieve a higher global attenuation. Simplified and more robust methods for SI estimation are favorable for a practical implementation. For example by controlling only velocity and angular rate or bending moments, a rather high attenuation can be achieved.

Item URL in elib:https://elib.dlr.de/135131/
Document Type:Conference or Workshop Item (Other)
Title:Numerical investigation towards the control of flexural waves using structural intensity for an active barrier of structure-borne sound
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Kokott, AlexanderUNSPECIFIEDhttps://orcid.org/0000-0002-0082-649XUNSPECIFIED
Haase, ThomasUNSPECIFIEDhttps://orcid.org/0000-0002-9553-9628UNSPECIFIED
Monner, Hans PeterUNSPECIFIEDhttps://orcid.org/0000-0002-5897-2422UNSPECIFIED
Date:26 May 2020
Journal or Publication Title:Active and Passive Smart Structures and Integrated Systems IX 2020
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Publisher:SPIE - The International Society for Optical Engineering
Series Name:Proceedings of SPIE
Keywords:noise barrier, active vibration control, structural intensity
Event Title:SPIE Smart Structures and NDE 2020
Event Location:Anaheim, CA, USA
Event Type:international Conference
Event Dates:27. Apr. - 01. Mai 2020
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Systems and Cabin (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Adaptronics
Deposited By: Kokott, Alexander
Deposited On:15 Jun 2020 07:49
Last Modified:17 Nov 2023 12:03

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