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【6h】A Coupled Electromechanical Model of Piezoelectret Foam in a Multi-layer Stack Configuration

機譯多層疊層結構中壓電陶瓷泡沫的耦合機電模型

【摘要】Piezoelectric polymers, such as the Emfit polypropylene piezoelectret foam investigated in this study, have distinct advantages over traditional piezoceramics. Although piezopolymers have a smaller piezoelectric coupling coefficient when compared to piezoceramics, they are well suited for in vivo applications, having a lead-free composition, for applications with curved or flexible surfaces, being flexible, or where weight or large shocks are factors, being light weight and resilient. Presented here is a 20-layer flexible electret stack harvester design with no adhesive between layers but that incorporates the Emfit foam electret material, composite graphene sheets as the electrode material, and Kapton tape as the encapsulation material. Also presented is an electromechanical, fully coupled, single degree of freedom model of the multilayer piezoelectret foam stack's mechanical and electrical vibration responses to harmonic base excitation, including a cubic stiffness nonlinear factor. The model parameters are tuned to fit the experimental data through an iterative error minimization process, with the final model accurately representing the stack's frequency response for a range of electrical load resistances on the stack. Finally, the energy harvesting capabilities of the electret stack are demonstrated by charging a 100 microfarad capacitor to 1.041 volts in 15 minutes and a 1000 microfarad capacitor to 1.025 volts in an hour.

【作者】Tefft, Edward C., IV.;

【作者單位】Tennessee Technological University.;

【年(卷),期】2018(),

【年度】2018

【頁碼】161 p.

【總頁數】161

【正文語種】eng

【中圖分類】TU9;

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