Vibroacoustics of 2D gradient auxetic hexagonal honeycomb sandwich panels

Mazloomi, Mohammad Sadegh; Ranjbar, Mostafa; Boldrin, Luca; Scarpa, Fabrizio; Patsias, Sophoclis; Özada, Neriman

doi:10.1016/j.compstruct.2017.10.077

Cited by 54 publications

(21 citation statements)

References 47 publications

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“…The idea of metamaterial is inspired by nature, as it is seen in the structure of some woods, bones and hard tissue of some animals. In engineering applications, it has been proved that these structures have a promising performance in shock and impact absorption 35,36 , improving the bending stiffness of thin-walled structures 37 and vibro-acoustics performance of sandwich panels 38,39 .…”

Section: Results Of This Study Can Open a New Path To Application Of mentioning

confidence: 99%

Study in circular auxetic structures for efficiency enhancement in piezoelectric vibration energy harvesting

Eghbali

Younesian

Moayedizadeh

et al. 2020

Sci Rep

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Piezoelectric (PZT) components are one of the most popular elements in vibration sensing and also energy harvesting. They are very well established, cost effective and available in different geometries however there are still several challenges in their application particularly in vibration energy harvesting. They are normally narrow-band elements and work in high-frequency range. Their efficiency and power extraction density are also generally low compared with different electromagnetic techniques. Auxetic structures are proposed here to enhance efficiency of the piezoelectric circular patches in vibration energy harvesting. These kinds of patches namely PZT buzzers are inexpensive (less than 10 USD) elements and easily available. Two novel circular auxetic substrates are proposed to improve power extraction capacity of the conventional piezoelectric buzzers. Negative Poison’s ratio of the proposed meta-structure helps in efficiency enhancement. The concept is introduced, analyzed and verified through the finite element modeling and experimental testing. The idea is proved to work by comparing the harvested electrical power in the auxetic design against the conventional plain system. A parametric study is then carried out and effects of important electrical and geometrical parameters as well as the material property on the power extraction efficiency are assessed to arrive at optimum parameters. It is shown that by employing the auxetic design, a remarkable improvement in the harvested power is achievable. It is shown that for the two proposed auxetic designs, at the resonance frequency, we could reach to 10.2 and 13.3 magnification factor with respect to the plain energy harvester. Another important feature is that the resonant frequency in these new designs is very much lower than the conventional resonators. Results of this study can open a new path to application of inexpensive PZT buzzers in large-scale vibration energy harvesting.

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Section: Results Of This Study Can Open a New Path To Application Of mentioning

confidence: 99%

Study in circular auxetic structures for efficiency enhancement in piezoelectric vibration energy harvesting

Eghbali

Younesian

Moayedizadeh

et al. 2020

Sci Rep

Self Cite

View full text Add to dashboard Cite

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“…35,36 Energy harvesting with auxetic structures is relatively new in the literature. Auxetic structures have a negative Poisson ratio, meaning that they contract transversely under uniaxial compression and expand laterally under extension.…”

Section: Introductionmentioning

confidence: 99%

“…There are different configurations that can give auxetic behavior. 35,36 Energy harvesting with auxetic structures is relatively new in the literature. A piezoelectric bimorph with auxetic structure has been introduced, which could improve the harvested power up to 2.76 times.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of piezoelectric vibration energy harvesting with auxetic boosters

2019

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This paper proposes a new concept to enhance the efficiency of the vibration energy harvesting via an intermediate booster. The boosters have auxetic struc-tures and exert extra stretching strain in two perpendicular directions. The concept is tested on a conventional cantilever beam under the base excitation. The problem consists of a cantilever beam subjected to a body load at low frequencies. An auxetic substrate is bonded to the beam with a thin epoxy layer, and the piezoelectric (PZT) element is attached on top of it. Two different auxetic structures are investigated in this study. It is shown that employing these kinds of boosters can remarkably enhance the performance of the energy harvesting system. The harvesting efficiency is numerically evaluated in different load amplitudes and frequencies. A parametric study is then carried out, and effects of different geometrical design parameters of the auxetic boosters on the performance of the energy harvesting system are investigated. Comparing with the case in which the PZT is straightly attached to the cantilever, it is shown that adding such intermediate boosters at low-frequency range can increase the extracted power by factors of 3.9 and 7.0 for the two proposed geometries.

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“…en, sandwich structures with combined conventional and re-entrant hexagonal metamaterials were investigated based on various characteristics, such as the specified objective deformations [28]; the strength and failure properties under bending, compressive and impact loads [29][30][31]; the dynamic behavior [32,33]; and the sound transmission performance [23,34]. Moreover, functionally gradient auxetic metamaterials based on other topologies, such as double arrowhead honeycombs (DAHs), have been developed [35][36][37][38] in recent years.…”

Section: Introductionmentioning

confidence: 99%

Vibration and Sound Transmission Performance of Sandwich Panels with Uniform and Gradient Auxetic Double Arrowhead Honeycomb Cores

Yang

2019

Shock and Vibration

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Auxetic mechanical metamaterials that exhibit a negative Poisson’s ratio (NPR) can be artificially designed to exhibit a unique range of physical and mechanical properties. Novel sandwich structures composed of uniform and gradient auxetic double arrowhead honeycomb (DAH) cores were investigated in terms of their vibration and sound transmission performance stimulated by nonhomogeneous metamaterials with nonperiodic cell geometries. The spectral element method (SEM) was employed to accurately evaluate the natural frequencies and dynamic responses with a limited number of elements at high frequencies. The results indicated that the vibrating mode shapes and deformations of the DAH sandwich models were strongly affected by the patterned gradient metamaterials. In addition, the sound insulation performance of the considered DAH sandwich models was investigated regarding the sound transmission loss (STL) from 1 Hz to 1500 Hz under a normal incident planar wave, and this performance was compared with that for hexagonal honeycomb sandwich panels. A programmable structural-acoustic optimization was implemented to maximize the STL while maintaining a constant weight and high strength. The results showed that the uniform DAH sandwich models with larger NPRs generally exhibited better vibration and acoustic attenuation behaviors and that the optimized gradient increasing NPR models yielded higher STL values than the optimized gradient decreasing NPR models for two specified frequency cases, with improvements of 6.52 dB and 2.52 dB and a higher bending stiffness but a lower overall STL. Thus, sandwich panels consisting of auxetic DAHs can achieve desirable vibroacoustic performance with a higher bending stiffness than conventional hexagonal honeycomb sandwich structures, and the design of gradient DAHs can be extended to obtain optimized vibration and noise-control capabilities.

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Vibroacoustics of 2D gradient auxetic hexagonal honeycomb sandwich panels

Cited by 54 publications

References 47 publications

Study in circular auxetic structures for efficiency enhancement in piezoelectric vibration energy harvesting

Study in circular auxetic structures for efficiency enhancement in piezoelectric vibration energy harvesting

Enhancement of piezoelectric vibration energy harvesting with auxetic boosters

Vibration and Sound Transmission Performance of Sandwich Panels with Uniform and Gradient Auxetic Double Arrowhead Honeycomb Cores

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