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<p>This study develops a comprehensive mathematical model for vibration-based energy harvesting in laminated bimorph cylindrical microshells with hexagonal honeycomb cores, subjected to nonlinear thermal gradients and moisture environments, and supported by a viscoelastic foundation. It is assumed that the sandwich microshell is subjected to various boundary conditions. The external layers use piezoelectric materials to improve energy conversion. First-order shear deformation theory (FSDT) and modified strain gradient theory (MSGT) are utilized to formulate size-dependent dynamic equations that incorporate microscale effects. The modified Gibson’s equation is used to estimate the material characteristics of the honeycomb core, which is considered a homogeneous orthotropic medium. Employing Hamilton’s principle and Gauss’s law, coupled electromechanical equations are derived to characterize the system’s dynamic behavior. Frequency response functions are found using analytical methods that correlate electrical power production with resistance to external loads. An extensive parametric study examines how energy harvesting efficiency is affected by geometric dimensions, length scale parameters, fluctuation of the temperature, variation of moisture, viscoelastic medium, parallel and series piezoelectric setups, boundary conditions, and honeycomb characteristics. The results provide important information for improving the design of nanoscale energy harvesters and their performance in viscoelastic and thermally dynamic environments.</p>

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Thermo-hygro-induced energy harvesting from piezoelectric sandwich cylindrical microshells with honeycomb cores

  • 期刊论文

  • 发表日期：

    2025年7月23日

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  • Pouyan Roodgar Saffari,
  • Teerapong Senjuntichai,
  • Peyman Roodgar Saffari,
  • Suraparb Keawsawasvong

摘要

This study develops a comprehensive mathematical model for vibration-based energy harvesting in laminated bimorph cylindrical microshells with hexagonal honeycomb cores, subjected to nonlinear thermal gradients and moisture environments, and supported by a viscoelastic foundation. It is assumed that the sandwich microshell is subjected to various boundary conditions. The external layers use piezoelectric materials to improve energy conversion. First-order shear deformation theory (FSDT) and modified strain gradient theory (MSGT) are utilized to formulate size-dependent dynamic equations that incorporate microscale effects. The modified Gibson’s equation is used to estimate the material characteristics of the honeycomb core, which is considered a homogeneous orthotropic medium. Employing Hamilton’s principle and Gauss’s law, coupled electromechanical equations are derived to characterize the system’s dynamic behavior. Frequency response functions are found using analytical methods that correlate electrical power production with resistance to external loads. An extensive parametric study examines how energy harvesting efficiency is affected by geometric dimensions, length scale parameters, fluctuation of the temperature, variation of moisture, viscoelastic medium, parallel and series piezoelectric setups, boundary conditions, and honeycomb characteristics. The results provide important information for improving the design of nanoscale energy harvesters and their performance in viscoelastic and thermally dynamic environments.