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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: Proceedings of SPIE - The International Society for Optical Engineering, 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 978-151063529-6. 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

Abstract

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
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Kokott, AlexanderAlexander.Kokott (at) dlr.dehttps://orcid.org/0000-0002-0082-649X
Haase, ThomasThomas.Haase (at) dlr.dehttps://orcid.org/0000-0002-9553-9628
Monner, Hans PeterHans.Monner (at) dlr.dehttps://orcid.org/0000-0002-5897-2422
Date:26 May 2020
Journal or Publication Title:Proceedings of SPIE - The International Society for Optical Engineering
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Volume:11376
DOI :10.1117/12.2558100
Publisher:SPIE - The International Society for Optical Engineering
ISSN:0277-786X
ISBN:978-151063529-6
Status:Published
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:22 Jun 2020 08:18

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