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首页> 外文期刊>Journal of Micromechanics and Microengineering >An improved small-deflection electromechanical model for piezoelectric bending beam actuators and energy harvesters
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An improved small-deflection electromechanical model for piezoelectric bending beam actuators and energy harvesters

机译：压电弯曲梁致动器和能量收集器的改进的小挠度机电模型

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The analytical model presented in this paper describes the energy conversion mechanism of a piezoelectric beam (bimorph) under small-deflection static and vibrating conditions. The model provides an improved approach to design and analyze the performance of piezoelectric actuators and energy harvesters (sensors). Conventional models assume a linear voltage distribution over the piezoelectric beam thickness, which is shown here to be invalid. The proposed modeling method improves accuracy by using a quadratic voltage distribution. The equivalent capacitance of a beam shows a 40% discrepancy between a conventional model and the proposed model for PZT5A material. This inaccuracy level is not negligible, especially when the design of micro-power electrical energy harvesting is concerned. The method solves simultaneously the solid mechanics and Maxwell's equations with the constitutive equations for piezoelectric materials. The paper also proposes a phasor-based procedure for measuring the damping of a piezoelectric beam. An experimental setup is developed to verify the validity of the model. The experimental results confirm the accuracy of the improved model and also reveal limitations in using models for small deflections.
机译：本文提出的分析模型描述了在小挠度静态和振动条件下压电梁（双压电晶片）的能量转换机理。该模型提供了一种改进的方法来设计和分析压电致动器和能量收集器（传感器）的性能。常规模型假定压电束厚度上存在线性电压分布，此处显示为无效。所提出的建模方法通过使用二次电压分布提高了精度。光束的等效电容显示，传统模型与建议的PZT5A材料模型之间存在40％的差异。这种误差水平是不可忽略的，尤其是在涉及微功率电能收集的设计时。该方法同时求解了固体力学和麦克斯韦方程组以及压电材料的本构方程。本文还提出了一种基于相量的方法来测量压电梁的阻尼。开发了实验装置以验证模型的有效性。实验结果证实了改进模型的准确性，也揭示了使用小挠度模型的局限性。

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