Theoretical analysis on hybrid local piezoelectric and conductive effect on sound absorption performance of porous poly(vinylidene fluoride)

Statharas, Eleftherios Christos; Yao, Kui; Zhang, Lei; Salloum, Rogério; Mohamed, Ayman Mahmoud; Tay, Francis Eng Hock

doi:10.1088/2053-1591/ab1972

Cited by 6 publications

(3 citation statements)

References 12 publications

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“…39,40 Our previous theoretical model and analysis show the potential of appropriate combination of local piezoelectric and optimal conductive effects for improving sound absorption performance of the porous polymer structure. 26 Therefore, we further measured the electrical impedance of the open-cell P(VDF-TrFE)/MWCNT nanocomposite foams to examine the effect of impedance matching on the sound absorption performance. We found that the addition of MWCNTs to the P(VDF-TrFE) polymer matrix significantly decreases the electrical impedance of the foams due to increased conductivity, as shown in Figure S6 in the supplementary material, which potentially in turn affects the impedance matching condition.…”

Section: Discussionmentioning

confidence: 99%

“…24 In our previous work, a concept of hybrid local piezoelectric and electrically conductive functions has been proposed for improving airborne sound absorption, where a composite foam made of porous PVDF mixed with conductive single-walled carbon nanotubes (SWCNTs) was used. 25,26 We improved the local piezoelectricity of open-cell PVDF foam by thermal annealing treatment to yield a high content of polar phase to improve passive airborne noise mitigation. 27 We also investigated how the KNN (K 0.5 Na 0.5 NbO 3 ) fillers with much stronger and opposite local piezoelectric effect affect the airborne sound absorption behaviors in the PVDF/KNN-nanofiber composite foams.…”

Section: Introductionmentioning

confidence: 99%

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Open-cell P(VDF-TrFE)/MWCNT nanocomposite foams with local piezoelectric and conductive effects for passive airborne sound absorption

Mohamed

Yao

Wang

et al. 2020

Journal of Applied Physics

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Open-cell nanocomposite foams of poly(vinylidene fluoride-co-trifluoroethylene) [P(VDF-TrFE)] and multi-walled carbon nanotubes (MWCNTs) were investigated for airborne sound absorption. When MWCNTs were well dispersed in the P(VDF-TrFE) matrix, the degree of crystallinity of the polar phase of the polymer was enhanced, and hence, the local piezoelectric effect and the electrical conductivity varied by nearly seven orders of magnitude dependent on the amount of MWCNT loading. The measurements in a standard acoustic tube showed that introduction of an appropriate amount of MWCNTs significantly enhanced the airborne sound absorption coefficient of P(VDF-TrFE) foam without poling, particularly in the lower and intermediate frequency range (below 2 kHz), which is attributed to the local piezoelectric effect in the polar polymer matrix and charge dissipation through the conductive MWCNT interfacing the polar phase. The experimental results and data analysis indicate that the open-cell nanocomposite foam with an optimal combination of local piezoelectric effect and electrical conductivity is promising for noise mitigation applications with enhanced passive airborne sound absorption.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Open-cell P(VDF-TrFE)/MWCNT nanocomposite foams with local piezoelectric and conductive effects for passive airborne sound absorption

Mohamed

Yao

Wang

et al. 2020

Journal of Applied Physics

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“…In vibration isolators, it is a traditional vibration isolation method that the damping materials is installing between vibration source and receptor such as industrial cotton, metal rubber, and polymer composite materials. However, traditional materials have poor energy dissipation performance on low-frequency vibrations, and large scale structures are often needed to improve vibration reduction performance (Statharas et al, 2019). Lu ZeQi et al proposed a parallel with a parallel-coupled nonlinear vibration isolator (Lu et al, 2022), Hao RongBiao et al proposed a Orthogonal six-DOFs vibration isolation with tunable high-static-low-dynamic stiffness (Hao et al, 2022b) and a nonlinear vibration isolator supported on a flexible plate (Hao et al, 2022a), Zhao Long studied longitudinal wave propagation in a metamaterial periodically arrayed with nonlinear resonators (Zhao et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Composite collaborative acoustic metamaterials: Isolating shaft vibration of guide roller in printing machine

Lei¹,

Wu²,

Zha³

et al. 2023

Journal of Vibration and Control

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During the operation of the unit type gravure press, the violent mechanical vibration generated by the guide roller will seriously affect the stability of the unit operation, and causing transmission faults such as wrinkle, offset, scratch or fracture, and reducing the printing accuracy. To this problem, a novel multi-approach composite collaborative vibration isolator which combines the local resonator and multi-layer composite structure is proposed to solve the problems of vibration suppression in the single frequency and vibration energy dissipation in the full frequency band, respectively, and the theoretical model on the proposed isolator is established basing on dynamic stiffness method. For demonstrating isolation performance, the regularized normalized modal displacement, power loss density, elastic strain energy density, total kinetic energy, and vibration transmission ratio can be discussed. The results show that the composite vibration isolator has a wide vibration isolation band, and the vibration wave has two attenuation bands within 0–2000 Hz. The first attenuation band is 188–224 Hz and the width is 36 Hz; the second attenuation band is greater than 328 Hz. When the band of the vibration isolator is above 700 Hz, the vibration transmission ratio shows a monotonous decreasing trend. Furthermore, an experimental platform for the vibration isolation device of the guide roller is established to verify the vibration isolation performance. When the drive motor frequency is 20 Hz, the composite vibration isolator has the best vibration isolation effect. At the same time, the vibration isolation effect gradually decreases with the increase of the guide roller speed, but it still has preferable vibration isolation performance under various working conditions.

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Enhanced airborne sound absorption effect in poly(vinylidene fluoride)/(K_0.5Na_0.5)NbO₃‐nanofiber composite foams

Mohamed

Yao

Wang

et al. 2020

J of Applied Polymer Sci

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Introducing electrical conductive function to discharge local piezoelectric effect is found effective for improving airborne sound absorption performance. In this work, instead of conductive fillers, a composite with two piezoelectric materials with opposite piezoelectric responses was explored aiming at enhanced sound absorption effect. Open‐cell poly(vinylidene fluoride)/(K0.5Na0.5)NbO3 (PVDF/KNN)‐nanofiber composite foams were proposed and investigated for airborne sound absorption purpose. Structural and thermal analyses showed that the KNN nanofibers were well dispersed in the PVDF matrix and enhanced the degree of crystallinity of polar phase of PVDF. Significantly enhanced airborne sound absorption over a broad frequency range was observed in the PVDF/KNN‐nanofiber composite foams, with increasing KNN nanofibers. One possible mechanism for the improved sound absorption with the piezoelectric KNN nanofibers with positive piezoelectric coefficient added in the PVDF matrix with negative piezoelectric coefficient is that electrical discharge could be facilitated for energy dissipation with the opposite charges generated through the piezoelectric effects in the two phases with opposite polarity. The experimental results show that the open‐cell PVDF/KNN‐nanofiber composite foams are promising for broadband airborne sound absorption application, and our analysis shed a light on the strategy in designing piezoelectric composite foam with high sound absorption performance.

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Theoretical analysis on hybrid local piezoelectric and conductive effect on sound absorption performance of porous poly(vinylidene fluoride)

Cited by 6 publications

References 12 publications

Open-cell P(VDF-TrFE)/MWCNT nanocomposite foams with local piezoelectric and conductive effects for passive airborne sound absorption

Open-cell P(VDF-TrFE)/MWCNT nanocomposite foams with local piezoelectric and conductive effects for passive airborne sound absorption

Composite collaborative acoustic metamaterials: Isolating shaft vibration of guide roller in printing machine

Enhanced airborne sound absorption effect in poly(vinylidene fluoride)/(K_0.5Na_0.5)NbO₃‐nanofiber composite foams

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Theoretical analysis on hybrid local piezoelectric and conductive effect on sound absorption performance of porous poly(vinylidene fluoride)

Cited by 6 publications

References 12 publications

Open-cell P(VDF-TrFE)/MWCNT nanocomposite foams with local piezoelectric and conductive effects for passive airborne sound absorption

Open-cell P(VDF-TrFE)/MWCNT nanocomposite foams with local piezoelectric and conductive effects for passive airborne sound absorption

Composite collaborative acoustic metamaterials: Isolating shaft vibration of guide roller in printing machine

Enhanced airborne sound absorption effect in poly(vinylidene fluoride)/(K0.5Na0.5)NbO3‐nanofiber composite foams

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Enhanced airborne sound absorption effect in poly(vinylidene fluoride)/(K_0.5Na_0.5)NbO₃‐nanofiber composite foams