Design method for an acoustic cloak in flows by topology optimization

Ma, Zhengyu; Stalnov, Oksana; Huang, Xun

doi:10.1007/s10409-019-00887-6

Cited by 17 publications

(3 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…gradient techniques or methods based on sensitivity analysis [2], to optimize the cost function. The deterministic approach was used for example by Jensen and Sigmund [4] to optimize a material distribution in a photonic crystal or by Ma et al [5] to design a structure of acoustic cloaks. Nevertheless, the SMMO are, by definition, local.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Fictitious Domain-Immersed Boundary Method in CFD-Based Topology Optimization

Kubíčková¹,

Isoz²

2022

Topical Problems of Fluid Mechanics 2022

View full text Add to dashboard Cite

Advances in technological development, especially in 3D printing, allow engineers to design components with almost arbitrary shape and connectivity. Consequently, more and more attention is being directed towards a highly-specialized application-driven component design based on topology optimization (TO). In the present work, we propose a methodology enabling TO of components in contact with flowing fluids. In particular, the optimization itself is based on multi-objective evolutionary algorithms (MOEAs) with the component geometry encoded using a binary representation. The optimization criteria are evaluated via computational fluid dynamics (CFD). The main novelty of the proposed TO framework lies in its robustness and effectiveness achieved by utilizing a single computational mesh for all the tested designs and projecting the specific components shapes onto it by the means of an immersed boundary method. The new methodology capabilities are illustrated on a shape optimization of a diffuser equipped as a part of an ejector. The optimization goal was to increase the ejector energy efficiency. The newly proposed methodology was able to identify a design by roughly 9 % more efficient than an alternative one found utilizing a previously published and less general optimization approach.

show abstract

Section: Introductionmentioning

confidence: 99%

Hybrid Fictitious Domain-Immersed Boundary Method in CFD-Based Topology Optimization

Kubíčková¹,

Isoz²

2022

Topical Problems of Fluid Mechanics 2022

View full text Add to dashboard Cite

show abstract

“…6 As this last research field is still mainly theoretical and numerical, 7,8 practical realizations of such a magic layer are not often discussed. The idea of using a Kevlar sheet is sometimes suggested 9 since acoustically transparent walls made from tensioned Kevlar cloth are nowadays used in wind tunnels. 10 However, the acoustic behavior of very large Kevlar walls (with respect to wavelength) is very different from that of smaller pieces.…”

Section: Introductionmentioning

confidence: 99%

Effect of flow on an array of Helmholtz resonators: Is Kevlar a “magic layer”?

D’Elia

Humbert

Aurégan

2020

The Journal of the Acoustical Society of America

View full text Add to dashboard Cite

The effects of flow on the acoustic behavior of metamaterials can be very significant and possibly destructive. To avoid these detrimental effects, it would be a good idea to have a “magic layer” that allows acoustics to pass through while suppressing the sound-flow interactions. A possible realization of this layer based on Kevlar fabric is tested in this paper. It is shown that, in the presence of Kevlar, flow-sound interactions that can lead to acoustic amplification and whistling phenomena are avoided. Thus, Kevlar will permit liner designs including large slits. However, it adds large acoustic losses, which limits interesting resonance effects in applications.

show abstract

“…11 However, the optimization proceeds by optimizing the positions and radii of cylinders for cloaking without changing the structural topology. Later, level set-based topology optimization for acoustic cloaks 12 and a density-based one for acoustic cloaks in the presence of background mean flows 13 were proposed. Recently, topological structural designs of acoustic cloaks amid the uncertainty in material properties or manufacturing were developed.…”

mentioning

confidence: 99%

Acoustic cloak designed by topology optimization for acoustic–elastic coupled systems

Fujii

Takahashi

Akimoto

2021

Applied Physics Letters

View full text Add to dashboard Cite

By including acoustic-elastic interactions in a topology optimization based on the covariance matrix adaptation evolution strategy, we developed acoustic cloaks of optimal design that render an object unobservable through airborne and water-borne sounds. This strategy helps in exploring optimal topologies that minimize the scattering of airborne and water-borne sounds around acoustic cloaks made from acrylonitrile butadiene styrene copolymers frequently used as ink in 3D printers. By applying level set methods, our designed cloaks are expressed as iso-surfaces representing the sharp structural boundaries between the acoustic and elastic media. On these boundaries, conditions that couple the elastic and acoustic aspects of the scattering are imposed. Furthermore, our cloak designs ensure that scatterers are unobservable to sound waves of multiple frequencies incident from various angles by minimizing the fitness incorporating multiple objective functions under several structural symmetries.

show abstract

Design method for an acoustic cloak in flows by topology optimization

Cited by 17 publications

References 28 publications

Hybrid Fictitious Domain-Immersed Boundary Method in CFD-Based Topology Optimization

Hybrid Fictitious Domain-Immersed Boundary Method in CFD-Based Topology Optimization

Effect of flow on an array of Helmholtz resonators: Is Kevlar a “magic layer”?

Acoustic cloak designed by topology optimization for acoustic–elastic coupled systems

Contact Info

Product

Resources

About