Adaptive Metacomposites for Vibroacoustic Control Applications

Collet, Manuel; Ouisse, Morvan; Tateo, Flaviano

doi:10.1109/jsen.2014.2300052

Cited by 26 publications

(15 citation statements)

References 22 publications

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“…This adaptive concept is different from active devices [15,16] in the sense that the time scale required in the temperature regulation is much smaller than the one of the phenomena to be controlled. It may however be qualified as semi-active [17,18] since some energy is required to heat the damping layer according to the objectives. The aim of the heat control is to tune the mechanical properties of the viscoelastic material: it is well known for years that their stiffness and damping properties are strongly dependent on frequency and temperature [19,20,21].…”

Section: Introductionmentioning

confidence: 99%

Damping control for improvement of acoustic black hole effect

Ouisse

Renault

Butaud

et al. 2019

Journal of Sound and Vibration

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Acoustic Black Holes are innovative solutions to damp vibrations through the use of power-law profiles in flexural beams and plates. However practical implementations of the concept are limited due to the finiteness of the thickness at the end of the beam. In this paper, it is proposed to add a viscoelastic layer on the ABH and control its mechanical properties by varying the temperature of the material in order to obtain an ABH with tunable properties. A design methodology of the damping layer is proposed, based on the computation of the reflection coefficient of the ABH termination, hence independent from the excitation and the boundary conditions of the host structure. This optimization is performed at a temperature close to the glass transition of the viscoelastic material in order to find the configuration providing the highest dissipation. Then, by controlling the temperature of the patch it is easy to tune the behavior of the ABH according to the practical application which is considered.

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Section: Introductionmentioning

confidence: 99%

Damping control for improvement of acoustic black hole effect

Ouisse

Renault

Butaud

et al. 2019

Journal of Sound and Vibration

Self Cite

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“…These smart composite structures have the abilities of modifying mechanical properties according to the environment (e.g. active vibration control [10]), of keeping their integrity (e.g. structural health monitoring [18]), of interacting with human beings (e.g.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the influence of a “soft layer” on the structural performance of a smart composite structure

et al. 2019

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The composite structures embedding piezoelectric implants are developed due to their abilities of modifying mechanical properties according to the environment, of keeping their integrity, of interacting with human beings or with other structures. One way to functionalize a mechanical device consists in embedding the transducers inside the final composite structure via a "soft" layer. This layer consists of two plies sandwiching the transducers, impregnated with a resin compatible with the one of the final composite structures. The test structures are laminates made of a glass-fiber reinforced plastic with a polyester resin. In this paper, we propose to experimentally investigate the influence of the throughthe-thickness position of the "soft layer" on specific parameters of design such as eigenfrequencies, modal amplitude, damping ratio and Lamb wave propagation properties. Results show that the "soft" layer behavior can not be neglicted to predict the behavior of the final product in particular for the eigenfrequencies and the modal amplitudes. However, the "soft layer" has no impact on the damping ratio and the Time-of-Flight of a wave train.

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“…The result is a smart lattice structure whose spatial wavefields can be programmed to display several complementary pattern corrections that relax the symmetry of the response. For this task, we resort to resonators consisting of thin, minimally invasive piezoelectric patches shunted with resistor-inductor (RL) circuits to realize resonant RLC units, adapting and perfecting a framework previously established for beams, plates and waveguides [45,[47][48][49][50][51][52][53][54]. The resonant frequency of each electromechanical resonator can be seamlessly varied by modifying the electrical impedance of the corresponding shunting circuit, which is carried out by simply tuning one of the circuit components.…”

Section: Introductionmentioning

confidence: 99%

Pathway towards Programmable Wave Anisotropy in Cellular Metamaterials

2018

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In this work, we provide a proof-of-concept experimental demonstration of the wave control capabilities of cellular metamaterials endowed with populations of tunable electromechanical resonators. Each independently tunable resonator comprises a piezoelectric patch and a resistor-inductor shunt, and its resonant frequency can be seamlessly re-programmed without interfering with the cellular structure's default properties. We show that, by strategically placing the resonators in the lattice domain and by deliberately activating only selected subsets of them, chosen to conform to the directional features of the beamed wave response, it is possible to override the inherent wave anisotropy of the cellular medium. The outcome is the establishment of tunable spatial patterns of energy distillation resulting in a non-symmetric correction of the wavefields. INTRODUCTIONCellular solids are porous media known to display unique combinations of complementary mechanical properties, such as high stiffness and high strength at low densities [1]. Lattice materials-cellular solids with ordered architectures-are obtained by spatially tessellating a fundamental building block (unit cell) comprising simple slender structural elements such as beams, plates or shells. Advances in additive manufacturing have recently propelled a resurgence of architected cellular solids as mechanical metamaterials with unprecedented functionalities at multiple scales [2][3][4][5]. Examples include fully-recoverable, energy absorbing lattices with bucklable struts [6,7], pentamode fluid-like materials that behave as "unfeelability" cloaks [8], lattices with negative Poisson's ratio [9], negative thermal expansion [10], and smart lattices with programmable stiffness [11].Lattice structures also display unique dynamic properties. They commonly feature Bragg-type bandgaps as a result of their periodicity and occasionally subwavelength bandgaps for special unit cell designs or in the presence of internal resonators, thus behaving as frequency-selective stop-band filters for acoustic [12], elastic [13][14][15][16][17][18][19] and electromagnetic waves [20]. They also display elastic wave anisotropy, which manifests as pronounced beaming of the energy according to highly directional patterns [13,[21][22][23][24][25][26][27][28][29][30]. This behavior can be attributed to the fact that, at the cell scale, elastic waves are forced to propagate along the often tortuous pathways dictated by the links/struts. The spatial characteristics, symmetry landscape and frequency dependence of the anisotropic patterns are dictated by the unit cell's architecture [31,32] and are usually irreversibly determined during the design and fabrication stages. To endow cellular solids with functional flexibility and active spatial wave management capabilities, we need our structural systems to be tunable or programmable [33][34][35][36][37][38][39][40][41][42]. To ensure that geometry and material requirements imposed by other functional constraints are preserved during the tuning pr...

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Adaptive Metacomposites for Vibroacoustic Control Applications

Cited by 26 publications

References 22 publications

Damping control for improvement of acoustic black hole effect

Damping control for improvement of acoustic black hole effect

Experimental investigation on the influence of a “soft layer” on the structural performance of a smart composite structure

Pathway towards Programmable Wave Anisotropy in Cellular Metamaterials

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