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<p>This study presents an advanced strategy to enhance vibration energy harvesting efficiency in cantilever sandwich plates by integrating auxetic piezoelectric cores. The approach is founded on two key aspects: (1) harnessing shear-mode energy harvesting, leveraged by the high piezoelectric coefficient (d₃₅), and (2) employing auxetic (negative Poisson’s ratio) piezoelectric cells to amplify shear stresses and provide tunable electromechanical properties. An advanced analytical framework was developed, wherein the effective properties of the auxetic cell were determined via homogenization techniques under periodic boundary conditions, and the vibration response was modeled using higher-order shear deformation theory. This model was coupled with a Deep Neural Network–Particle Swarm Optimization (DNN–PSO) algorithm for multi-objective optimization to simultaneously maximize voltage output and minimize mass. Comparative results demonstrate that the optimized auxetic core achieved a 627% increase in voltage (161.38 V vs. 22.22 V) and a 692% increase in power (0.152 W vs. 0.0192 W) compared to a conventional bulk piezoelectric core, while realizing an 87.1% reduction in weight (7.9 g vs. 61.4 g) and delivering a high specific power of 19.39 W/kg. When benchmarked against a bimorph harvester, the proposed design yielded a 23.6% higher voltage (161.38 V vs. 130.56 V), maintained the same significant weight reduction, and offered a 27.4% lower specific power (19.39 W/kg vs. 26.71 W/kg). These findings highlight the auxetic core’s potential as a transformative, lightweight, and high-efficiency solution for next-generation energy harvesters, especially in applications where weight constraints are as critical as power performance.</p>

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Vibration Energy Harvesting of a Sandwich Plate with Auxetic Piezoelectric Core: Determination and Optimization Using DNN–PSO Integrated with the Finite Element Method

  • 期刊论文

  • 发表日期：

    2025年12月10日

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  • Seyed Mohammad Reza Khalili,
  • Hossein Ranjbarzadeh,
  • Seyed Hossein Sadati

摘要

This study presents an advanced strategy to enhance vibration energy harvesting efficiency in cantilever sandwich plates by integrating auxetic piezoelectric cores. The approach is founded on two key aspects: (1) harnessing shear-mode energy harvesting, leveraged by the high piezoelectric coefficient (d₃₅), and (2) employing auxetic (negative Poisson’s ratio) piezoelectric cells to amplify shear stresses and provide tunable electromechanical properties. An advanced analytical framework was developed, wherein the effective properties of the auxetic cell were determined via homogenization techniques under periodic boundary conditions, and the vibration response was modeled using higher-order shear deformation theory. This model was coupled with a Deep Neural Network–Particle Swarm Optimization (DNN–PSO) algorithm for multi-objective optimization to simultaneously maximize voltage output and minimize mass. Comparative results demonstrate that the optimized auxetic core achieved a 627% increase in voltage (161.38 V vs. 22.22 V) and a 692% increase in power (0.152 W vs. 0.0192 W) compared to a conventional bulk piezoelectric core, while realizing an 87.1% reduction in weight (7.9 g vs. 61.4 g) and delivering a high specific power of 19.39 W/kg. When benchmarked against a bimorph harvester, the proposed design yielded a 23.6% higher voltage (161.38 V vs. 130.56 V), maintained the same significant weight reduction, and offered a 27.4% lower specific power (19.39 W/kg vs. 26.71 W/kg). These findings highlight the auxetic core’s potential as a transformative, lightweight, and high-efficiency solution for next-generation energy harvesters, especially in applications where weight constraints are as critical as power performance.