Suppression of flow-induced noise and vibrations by locally resonant metamaterials

Pires, Felipe Alves; Sangiuliano, Luca; Denayer, Hervé; Deckers, Elke; Claeys, Claus; Desmet, Wim

doi:10.2514/6.2020-2586

Cited by 2 publications

(8 citation statements)

References 18 publications

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“…For the mixed case, two stop bands are predicted: one stop band opens from 566.8 Hz to 605 Hz which is related to the resonators design A and another created from 736.3 Hz to 800.2 Hz, which is related to resonators design B. These stop bands are smaller than for the SRT case and for when the plate is fully treated with resonators of design B [17] and this is due to the fact that only half of the resonators are tuned to the same natural frequency within a same area. In addition, they also lie in a slightly lower frequency range, and this is due to the interaction of the two different tuned locally resonant additions [24].…”

Section: F Stop Band Predictionmentioning

confidence: 87%

“…In order to design a metamaterial solution, the dynamic behavior of the structure of interest needs to be evaluated. In this case, the vibrational response of the flat plate in Figure 4 with no flow is known from [18]. The authors reported that the considered structure has a pronounced dynamic behavior below 1000 Hz with the highest peak amplitude around 600 Hz for the considered conditions.…”

Section: Unit Cell Modeling and Metamaterials Designmentioning

confidence: 99%

“…the mass of the bare plate. It is worth pointing out that the case which the plate is entirely covered with resonators of design B is not considered here since the main goal of the paper is to target a frequency range where vortex-shedding is expected [18] and to check if by combing resonators tuned at different frequencies can also lead to noise radiation reduction at multiple frequency regions.…”

Section: E Metamaterials Configurationsmentioning

confidence: 99%

“…In fact, the potential of LRMs was investigated previously for a turbulent flow excitation in [17,18]. In the former, a metamaterial solution was developed to tackle TBL-induced noise and vibrations of a cavity-backed flat plate.…”

Section: Introductionmentioning

confidence: 99%

“…It proposes the use of LRMs with multiple stop band behavior to reduce flow-induced noise and vibrations caused by a vortex street in the wake of a cylindrical rod and it is an extension of the aforementioned works. This study considers the same hard-walled backing-cavity used in [17], which will be attached to the flat plate excited by vortex-shedding in [18]. The vibrations of the flat plate as well as the noise radiation into the cavity are experimentally analyzed.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Reducing flow-induced noise and vibrations by resonant metamaterials with multiple stop band behavior

Pires

Denayer

Deckers

et al. 2021

Aiaa Aviation 2021 Forum

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In the search for novel Noise, Vibrations and Harshness (NVH) solutions, vibro-acoustic locally resonant metamaterials (LRMs) have recently emerged, combining a good NVH behavior and a lightweight design in desired frequency regions, referred to as stop bands i.e. frequency zones of strong vibration and/or noise attenuation. This paper experimentally investigates the potential of using LRMs with multiple stop band behavior to reduce flow-induced noise and vibrations of coupled vibro-acoustic systems. In a first stage, the vibrations of a flat plate excited by a turbulent flow under the influence of vortex-shedding are analyzed and a metamaterial solution for a multiple stop band behavior is designed. In a second stage, a hard-walled backing-cavity is attached to the system and the noise radiation due to the plate's vibrations into the backing cavity is assessed. The flat plate is then treated with the designed resonant additions and the results show that the metamaterial solution is able to suppress the consequential noise radiation to the coupled cavity due to flow-induced vibrations phenomena.

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Section: F Stop Band Predictionmentioning

confidence: 87%

Section: Unit Cell Modeling and Metamaterials Designmentioning

confidence: 99%

Section: E Metamaterials Configurationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Reducing flow-induced noise and vibrations by resonant metamaterials with multiple stop band behavior

Pires

Denayer

Deckers

et al. 2021

Aiaa Aviation 2021 Forum

Self Cite

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Development of the SmartAnswer Demonstrator: a Didactic Wind Tunnel for Aeroacoustic Applications

Tamaro

Zamponi

Schram

2022

28th AIAA/CEAS Aeroacoustics 2022 Conference

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A small didactic wind tunnel demonstrator has been designed and manufactured at the von Karman Institute for Fluid Dynamics to illustrate the physical principles at stake in flow-induced noise generation, offer an audible perception of the effectiveness of noise-mitigation strategies, and serve as a practical test bench for aeroacoustic education and research. Seven mitigation technologies are embedded in a single facility, which addresses the noise generation by an airfoil, noise propagation in a duct, and noise transmission through a flexible panel. A challenging objective of this facility was to offer a perceptible impression of various aeroacoustic noise mechanisms at low flow speeds and a live assessment of the effectiveness of the noisereduction technologies. Different approaches combining multiple microphones, advanced signal-processing techniques, and real-time audio feedback have been implemented to this end. The results establish that the demonstrator enables a clear perception of the effectiveness of the noise-mitigation technologies. The facility is also suitable for fast and inexpensive preliminary investigations of future noise-reduction concepts, taking advantage of rapid prototyping techniques.

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Suppression of flow-induced noise and vibrations by locally resonant metamaterials

Cited by 2 publications

References 18 publications

Reducing flow-induced noise and vibrations by resonant metamaterials with multiple stop band behavior

Reducing flow-induced noise and vibrations by resonant metamaterials with multiple stop band behavior

Development of the SmartAnswer Demonstrator: a Didactic Wind Tunnel for Aeroacoustic Applications

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