Investigation of the application possibilities of acoustic black holes as design features in the context of model-based structural dynamic optimization

Felix Christian, Schurk; Müller, Julius; Wischmann, Stefan Tobias; Wassmann, Linus Felix; Jacobs, Georg

doi:10.18154/RWTH-2025-05339

Investigation of the application possibilities of acoustic black holes as design features in the context of model-based structural dynamic optimization = Untersuchung der Anwendungsmöglichkeiten von akustischen schwarzen Löchern als Design Features im Rahmen der modellbasierten strukturdynamischen Optimierung

Felix Christian, Schurk^RWTH*

2025

Verantwortlichkeitsangabepresented by Felix Christian Schurk

ImpressumAachen : RWTH Aachen University 2025

Umfang1 Online-Ressource : Illustrationen

Masterarbeit, Rheinisch-Westfälische Technische Hochschule Aachen, 2025

Veröffentlicht auf dem Publikationsserver der RWTH Aachen University

Genehmigende Fakultät
Fak04

Hauptberichter/Gutachter
Jacobs, Georg (Thesis advisor)^RWTH* ; Wischmann, Stefan Tobias (Consultant)^RWTH* ; Müller, Julius (Consultant)^RWTH* ; Wassmann, Linus Felix (Consultant)

Tag der mündlichen Prüfung/Habilitation
2025-06-04

Online
DOI: 10.18154/RWTH-2025-05339
URL: https://publications.rwth-aachen.de/record/1013096/files/1013096.pdf

Einrichtungen

Lehrstuhl und Institut für Maschinenelemente und Systementwicklung (411710)

Thematische Einordnung (Klassifikation)
DDC: 620

Kurzfassung
The increasing demand for reduced noise and vibration in modern machinery necessitates the integration of advanced noise control features. Acoustic Black Holes (ABHs), characterized by their ability to effectively trap vibrational energy, offer a promising design solution for improving Noise, Vibration and Harshness (NVH)performance. Good NVH properties are crucial for user comfort, ensuring reliable performance in modern machinery and improving perceived product quality. However, existing research predominantly focuses on simple, academic geometries, leaving a significant gap in methodologies applicable to the investigation of ABHs embedded within complex, arbitrary engineering structures. This thesis contributes to addressing this gap by developing a methodology for the analysis of ABH features in realistic geometries. The primary aim is to establish a transferable approach capable of assessing the performance of ABHs in complex structural designs and to deepen the understanding of the underlying physical mechanisms governing their behavior. The developed methodology is fundamentally based on the Finite Element Method (FEM), designed to analyze the energy localization within structures incorporating ABHs. The developed FEM-based methodology is also suitable for integration into model-based design processes, facilitating practical application in engineering workflows. To investigate and validate the effectiveness of this FEM-based methodology, sensitivity studies were performed across various parameters and geometries. Key findings from this study indicate the successful performance of the methodology in evaluating ABH behavior, based on the comparison between a reference and a design model. Crucially, the research also reveals, through the application of this methodology in the sensitivity study, that the energy localization is not solely sufficient for a comprehensive evaluation of ABH performance in complex models. This work contributes to the field of structural acoustics by providing a practical framework for the model-based analysis of ABHs in industrially relevant geometries and by proposing a new energy based method for the evaluation of ABHs. Unlike studies focused solely on sound pressure levels, this research delves into the fundamental structural mechanical properties responsible for vibration attenuation, offering deeper insights into the practical application and design optimization of acoustic black holes.

OpenAccess:
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