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Experimental Investigation of Structural Intensity Control in a Vibrating Panel Using a Finite Differencing Approach

Kokott, Alexander and Monner, Hans Peter (2023) Experimental Investigation of Structural Intensity Control in a Vibrating Panel Using a Finite Differencing Approach. In: 10th Convention of the European Acoustics Association, EAA 2023, pp. 5261-5266. Forum Acusticum 2023, 2023-09-11 - 2023-09-15, Turin, Italien. doi: 10.61782/fa.2023.0846. ISBN 978-888894267-4. ISSN 2221-3767.

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Official URL: https://dael.euracoustics.org/confs/fa2023/data/articles/000846.pdf


The active reduction of vibrational energy flow by means of structural intensity (SI) proposes to be an effective approach towards global downstream attenuation of a structure based on preliminary numerical studies. This work examines an approach on SI control by approximating the latter by finite differencing arrays of velocities. Here, only transversal waves are considered. Different levels of complexity are taken into consideration and compared to a state-of-the-art active vibration control. A feedforward controller is estimated based on the disturbance force as a reference signal. The controller minimizes the target functions, being different components of SI in order to evaluate the impact of error sensor array complexity on global reduction. Furthermore, multiple configurations of control actuators, specifically inertial shakers, are investigated. It can be shown that targeting additional internal forces benefits in a significantly lower global vibration level downstream of the error sensor positions, whilst using a less dense array of sensors with respect to wavelength of the sound. However, as already shown in numerical studies, implementing internal forces up to third order of spatial derivatives (shear forces) perform worse than a simple approach with additional angular velocity, as sensing errors amplify non-linearly.

Item URL in elib:https://elib.dlr.de/197608/
Document Type:Conference or Workshop Item (Speech)
Title:Experimental Investigation of Structural Intensity Control in a Vibrating Panel Using a Finite Differencing Approach
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Kokott, AlexanderUNSPECIFIEDhttps://orcid.org/0000-0002-0082-649XUNSPECIFIED
Monner, Hans PeterUNSPECIFIEDhttps://orcid.org/0000-0002-5897-2422UNSPECIFIED
Date:September 2023
Journal or Publication Title:10th Convention of the European Acoustics Association, EAA 2023
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 5261-5266
EditorsEmailEditor's ORCID iDORCID Put Code
Astolfi, AriannaPolitecnico di TorinoUNSPECIFIEDUNSPECIFIED
Asdrudali, FrancescoRoma Tre UniversityUNSPECIFIEDUNSPECIFIED
Shtrepi, LouenaPolitecnico di TorinoUNSPECIFIEDUNSPECIFIED
Keywords:structural intensity, active control, flexural waves
Event Title:Forum Acusticum 2023
Event Location:Turin, Italien
Event Type:international Conference
Event Start Date:11 September 2023
Event End Date:15 September 2023
Organizer:European Acoustics Association
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Components and Systems
DLR - Research area:Aeronautics
DLR - Program:L CS - Components and Systems
DLR - Research theme (Project):L - MRO and Cabin
Location: Braunschweig
Institutes and Institutions:Institut für Systemleichtbau > Adaptronics
Deposited By: Kokott, Alexander
Deposited On:01 Nov 2023 08:43
Last Modified:23 May 2024 08:58

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