Conceptual development of vibroacoustic metamaterial structures for thin-walled composite structures for aerospace applications

Manushyna, Daria; Atzrodt, Heiko; Deschauer, N.

doi:10.1109/metamaterials49557.2020.9285021

Cited by 7 publications

(1 citation statement)

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“…While there are a large variety of works that have focused on the application of VAMMs on non-rotating structures, for example, in aviation and space [6,7], the automotive industry [8] and machinery [9,10], there is limited information regarding their behavior in the rotating state, though thin-walled rotors often face severe vibration problems. For example, the sound emitted by a circular saw blade predominately goes back to the vibrations of the saw blade [11] which are excited by the sawing process.…”

Section: Introductionmentioning

confidence: 99%

Vibration Reduction on Circular Disks with Vibroacoustic Metamaterials

Rieß,

Schmidt,

Kaal

et al. 2024

Applied Sciences

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Vibroacoustic metamaterials represent an innovative technology developed for broadband vibration reduction. They consist of an array of local resonators and are able to reduce vibrations over a wide frequency range, commonly referred to as a stop band. Vibroacoustic metamaterials may be a promising strategy to reduce out-of-plane vibrations of thin-walled, disk-shaped structures, such as saw blades. However, their behavior in rotating systems has not yet been fully understood. In this study, a vibroacoustic metamaterial integrated into a circular disk for the reduction of out-of-plane vibrations is experimentally investigated in the rotating and non-rotating state. Derived from the predominant frequency range of noise emitted by saw blades, a vibroacoustic metamaterial with a numerically predicted stop band in the frequency range from 2000 Hz to 3000 Hz, suitable for integration into a circular disk, is designed. The resonators of the metamaterial are realized by cutting slots into the disk using a waterjet cutting machine. To experimentally examine the structural dynamic behavior, the disk is excited by an impulse hammer and observed by a stationary optical velocity sensor on a rotor dynamics test stand. The results of the rotating and the non-rotating state are compared. The measurements are carried out at two different radii and at speeds up to 3000 rpm. A distinct stop band characteristic is shown in the desired frequency range from 2000 Hz to 3000 Hz in the rotating and non-rotating state. No significant shift of the stop band frequency range was observed during rotation. However, adjacent modes were observed to propagate into the stop band frequency range. This work contributes to a better understanding of the behavior of vibroacoustic metamaterials in the rotating state and enables future applications of vibroacoustic metamaterials for vibration reduction in rotating, disk-shaped structures such as saw blades, brake disks or gears.

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Section: Introductionmentioning

confidence: 99%

Vibration Reduction on Circular Disks with Vibroacoustic Metamaterials

Rieß,

Schmidt,

Kaal

et al. 2024

Applied Sciences

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Identifying Factors Influencing the Properties of Vibroacoustic Metamaterials Using Three Different Acoustic Methods

Kollmannsperger,

Kaal,

Becker

et al. 2024

Adv Eng Mater

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Vibroacoustic metamaterials offer an approach for the targeted damping of unwanted structural vibrations and noise by integrating periodically arranged resonators into a matrix of bulk material. Fabrication using the Laser Bed Powder Fusion (L‐PBF) process allows the targeted integration of bulk resonators and powder depots, leading to an extension of the designable damping properties. In this work, we focus on the adaptation of acoustic methods to characterize the properties of metamaterial plates. The investigated vibroacoustic metamaterial plates are made of nylon PA 1.2, combining material and structural damping. We investigated the vibration behavior of the plates over a range of frequencies using acoustic impedance measurements in a custom‐built measurement tube and compared it with structural dynamics experiments using an electrodynamic shaker. The measurements allow for the identification of stop bands (frequency range with high damping) and influencing factors such as metamaterial design, mass, powder amount and surface on the frequency dependent damping properties. The adapted technique investigated in this work provides an experimental platform to characterize the complex interplay of acoustic metamaterial design and holds promise for scaling up metamaterial technology for industrial applications due to its simplicity, small space requirement, and low cost.This article is protected by copyright. All rights reserved.

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