Experimental validation of vibration damping using an Archimedean spiral acoustic black hole

Park, Seongmin; Kim, M.; Jeon, Wonju

doi:10.1016/j.jsv.2019.07.004

Cited by 63 publications

(28 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Acoustic black holes (ABHs) have drawn increasing attention in the past decade as a passive, lightweight and highly-efficient method for vibration [1][2][3][4][5] and noise [6][7][8] control, energy harvesting [9,10] or focusing [11,12], and wave manipulation [13][14][15]. With the possible exception of the Archimedean spiral ABH for beams that was investigated numerically in [16] and experimentally in [17], almost all works to date have dealt with ABH indentations on straight beams [18,19] and flat plates [20][21][22]. However, many built-up engineering structures contain curved beams and shells.…”

Section: Introductionmentioning

confidence: 99%

Vibration of cylindrical shells with embedded annular acoustic black holes using the Rayleigh-Ritz method with Gaussian basis functions

Deng

Guasch

Maxit

et al. 2021

Mechanical Systems and Signal Processing

View full text Add to dashboard Cite

The numerical simulation of beams and plates with embedded acoustic black holes (ABHs) is computationally demanding because of the very thin thickness attained at the ABH central area. Semi-analytical approaches relying on the Rayleigh-Ritz method with wavelet or Gaussian basis functions have thus revealed as an accurate and fast alternative to determine the ABH vibration field in parametric studies. To date however, the vast majority of works on ABHs have only dealt with ABH indentations on straight beams and flat plates. It would be also worth exploring the feasibility of ABHs to control the vibrations of curved shells, typically found in aerospace and naval structures. In this work, we address this issue and extend the Gaussian expansion method (GEM) to characterize annular ABHs embedded on cylindrical shells. First, we show how the GEM can be modified to make Gaussian shape functions satisfy periodic boundary conditions in the circumferential direction of the cylinder. The GEM is then used to determine the vibration field of the ABH cylindrical shell and gets validated by comparison with finite element simulations. A thorough analysis of the performance of the annular ABH follows, which stresses the differences with the behavior of ABHs on flat surfaces. In particular, we show the influence that waves propagating in the circumferential direction have on the operational frequency range of the ABH. The effects of the viscoelastic layer and the inclusion of longitudinal stiffeners to strengthen the cylinder rigidity are also analyzed by means of the proposed GEM approach. This work broadens previous semi-analytical methods to start investigating the ABH effect on curved structures.

show abstract

Section: Introductionmentioning

confidence: 99%

Vibration of cylindrical shells with embedded annular acoustic black holes using the Rayleigh-Ritz method with Gaussian basis functions

Deng

Guasch

Maxit

et al. 2021

Mechanical Systems and Signal Processing

View full text Add to dashboard Cite

show abstract

“…Lee 和 Jeon 又继续研究了不同几何参数和频率下的圆弧型和阿基米德螺旋型声学黑洞的反射系数 [26] , 通过计算它们的截止频率, 发现不同于经典一维声学黑洞的截止频率几乎与曲率成正比线性增加的情况，在阿基米德螺旋型一维声学黑洞中, 截止频率随间隙距离的增大而减小. Park 等人 [35] 实现了不同构型的螺旋一维声学黑洞(图 3(b)), 深入分析了不同类型的阿基米德螺线对声学黑洞反射系数的影响. Tang 和 Cheng 在 2017 年首次提出一维双叶型声学黑洞梁结构 [36] , 如图 3(c)所示, 实验结果表明, 在仅有三个周期的声学黑洞单元的情况下, 依然可以在包括低频在内的超宽频率范围内实现较大的振动能量衰减.…”

Section: 减振unclassified

Progress and applications of acoustic black holes

et al. 2021

View full text Add to dashboard Cite

“…The problem can be avoided by placing a viscoelastic layer at the tip of the wedge to dissipate energy where it most concentrates [20]. Recently, several strategies have been investigated to enhance energy dissipation and thus reduce the ABH reflection coefficient, such as setting an extended platform at the end of the ABH wedge [21,22], exploiting the ABH geometric non-linearity [23], using spiral terminations [24,25], resorting to passive constrained viscoelastic layers [26] or employing viscoelastic layers with tunable parameters [27].…”

Section: Introductionmentioning

confidence: 99%

Reduction of Bloch-Floquet bending waves via annular acoustic black holes in periodically supported cylindrical shell structures

et al. 2020

View full text Add to dashboard Cite

In recent years, acoustic black holes (ABHs) have revealed as a very effective method for the passive reduction of vibrations in flat plates and straight beams. Those essentially consist of circular indentations and/or side boundaries, whose thicknesses decrease to zero following a power-law profile. Nonetheless, many structures in the aeronautical and naval sectors, among others, involve cylindrical structures with periodic stiffeners or supports. Such periodic structures admit the propagation of Bloch-Floquet (BF) bending waves at some frequency passbands, which may result in strong vibration levels and noise radiation. In this work, we propose the design of annular ABHs to mitigate the problem. A wave finite element model is first used to determine the frequency passbands on an ideal, periodically simply supported cylindrical shell of infinite length, with embedded annular ABHs. Then, a long, but now finite simply supported cylindrical shell, is presented to show how the transmissibility between two sections strongly diminishes with the inclusion of ABHs. That confirms annular ABHs as a very effective means of reducing BF wave propagation. Unfortunately, embedding ABHs on the shell weakens its structural rigidity so a thorough analysis is made on the effects of inserting stiffeners in the longitudinal direction to partially remedy that inconvenient. Quite surprisingly, it is shown that the inclusion of stiffeners can even enhance the performance of the ABHs for some configurations. To finally foresee the potential of annular ABHs for practical applications, a finite element simulation is made on a slightly more realistic geometry, resembling a very simplified version of the hull of a submarine vehicle or a gas tank.

show abstract

Experimental validation of vibration damping using an Archimedean spiral acoustic black hole

Cited by 63 publications

References 27 publications

Vibration of cylindrical shells with embedded annular acoustic black holes using the Rayleigh-Ritz method with Gaussian basis functions

Vibration of cylindrical shells with embedded annular acoustic black holes using the Rayleigh-Ritz method with Gaussian basis functions

Progress and applications of acoustic black holes

Reduction of Bloch-Floquet bending waves via annular acoustic black holes in periodically supported cylindrical shell structures

Contact Info

Product

Resources

About