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Investigation towards an active barrier for structure borne sound using structural intensity

Kokott, Alexander and Haase, Thomas and Monner, Hans Peter (2019) Investigation towards an active barrier for structure borne sound using structural intensity. ICA2019 23rd International Congress on Acoustics, 09.-13. Sep. 2019, Aachen, Deutschland.

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Abstract

Vibrations of aircraft or vehicle engines, for instance, are often transmitted by structure borne sound, leading to a significant radiation of noise inside passenger cabins. Current active vibration control concepts use either velocity or acceleration as a control source. However, these only lead to a local reduction in vibration and not necessarily to the reduction of the vibration energy flow. This study presents the implementation of current methods for structural intensity measurement with a real-time control. The work investigates one and two-dimensional structures. A reduction of energy flow in a beam structure is shown experimentally, as well as numerically for plates. The measurements are strongly influenced by theoretical simplifications concerning the composition of the structure borne waves and the quality of the sensor arrays used, i.e. the sensor spacing and the positioning accuracy. Though, sufficient accordance between numerically and experimentally estimated structural intensity can be found using methods with smaller sensor arrays. A barrier effect is shown by numerical investigations and is measured on a beam. Therefore, the control of vibration energy flow is a more effective method for a global reduction if vibration downstream the control area.

Item URL in elib:https://elib.dlr.de/129287/
Document Type:Conference or Workshop Item (Speech)
Title:Investigation towards an active barrier for structure borne sound using structural intensity
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:13 September 2019
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Körperschall, Strukturintensität, Barriere, Active Control
Event Title:ICA2019 23rd International Congress on Acoustics
Event Location:Aachen, Deutschland
Event Type:international Conference
Event Dates:09.-13. Sep. 2019
Organizer:DEGA
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:30 Sep 2019 17:36
Last Modified:01 Jan 2022 03:00

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