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Experimental Realization of a Sound Radiation Filter for Feedforward Control to Improve Active Structural Acoustic Control Systems

Haase, Thomas and Bühmann, Henning and Radestock, Martin and Monner, Hans Peter (2017) Experimental Realization of a Sound Radiation Filter for Feedforward Control to Improve Active Structural Acoustic Control Systems. In: SAE Noise & Vibration Exhibition. SAE International. SAE Noise and Vibration Exhibition, 12.-15. Juni 2017, Grand Rapids, Michigan, USA. DOI: 10.4271/2017-01-1830

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Abstract

Due to the strengthened CO2 and NOx regulations, future vehicles have to be lightweight and efficient. But, lightweight structures are prone to vibrations and radiate sound efficiently. Therefore, many active control approaches are studied to lower noise radiation besides the passive methods. One active approach for reducing Sound radiation from structures is the active structural acoustic control (ASAC). Since the early 90’s, several theoretical studies regarding ASAC systems were presented, but only very little experimental investigations can be found for this alternative to passive damping solutions. The theoretical simulations show promising results of ASAC systems compared to active vibration control approaches. So, for that reason in this paper an experiment is conducted to investigate the performance of an ASAC system in the frequency range up to 600 Hz. A regular sensor grid of 24 accelerometers that are interconnected to establish six radiation signals is applied to an aluminum plate. The plate is excited by a point force and the feedforward control system counteracts these vibrations with 2 inertial actuators. The radiated sound power can be reduced by 4 dB integrated over the targeted frequency band. Compared to an active vibration control system which results only in a 0.2 dB decreased sound radiation, the ASAC system is beneficial. Furthermore, the filter length and the causality aspect of the experiments are analyzed in order to investigate the digital signal processing requirements. It can be shown that short filters are sufficient for an ASAC System compared to the filter length needed for an AVC system. In the last part of this paper some technical simplifications are investigated in order to reduce the complexity of the sound Radiation filters. It is shown that the high pass filters needed to model the radiation efficiency can be neglected with a very small loss of performance.

Item URL in elib:https://elib.dlr.de/112952/
Document Type:Conference or Workshop Item (Speech)
Title:Experimental Realization of a Sound Radiation Filter for Feedforward Control to Improve Active Structural Acoustic Control Systems
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Haase, ThomasThomas.Haase (at) dlr.dehttps://orcid.org/0000-0002-9553-9628
Bühmann, HenningTU BraunschweigUNSPECIFIED
Radestock, MartinMartin.Radestock (at) dlr.dehttps://orcid.org/0000-0002-9918-3315
Monner, Hans PeterHans.Monner (at) dlr.dehttps://orcid.org/0000-0002-5897-2422
Date:5 June 2017
Journal or Publication Title:SAE Noise & Vibration Exhibition
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.4271/2017-01-1830
Publisher:SAE International
Status:Published
Keywords:Radiation filter, ASAC, Schallabstrahlung, aktive Systeme
Event Title:SAE Noise and Vibration Exhibition
Event Location:Grand Rapids, Michigan, USA
Event Type:international Conference
Event Dates:12.-15. Juni 2017
Organizer:SAE International
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
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Adaptronics
Deposited By: Haase, Thomas
Deposited On:14 Aug 2017 09:46
Last Modified:14 Aug 2017 09:46

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