性能校正和参数识别,考虑到杆压电收获器中不均的电场
Xianfeng Wang1,2, Hui Liu1,2, Huadong Zheng1,2
1School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China.
Sensors (Basel, Switzerland)
|August 10, 2024
概括
这项研究通过考虑不均的电场来纠正压电能量收割机模型,改善输出功率预测和材料参数识别,以提高设备性能.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 电气工程 电气工程
背景情况:
- 目前的压电能量收割机模型通常假定一个统一的电场,这是一个过度简化.
- 压电曲器中不均的应变分布导致不均的内部电场,挑战了平行板电容器假设.
研究的目的:
- 通过结合不均的电场来开发一个更准确的电机模型,用于悬臂压电能量收割机.
- 纠正和简化传统的分布式参数模型,使其成为一个实用的单模式模型.
- 调查不均电场对功率输出预测和材料参数识别的影响.
主要方法:
- 使用静电平衡方程解决不均的电场.
- 纠正了电机械控制方程中的曲刚度项.
- 通过对二维有限元分析验证模型.
- 对材料参数识别的反向问题进行了研究.
主要成果:
- 与传统的均电场模型相比,拟议的模型在预测输出功率方面显示出更高的准确性.
- 相对校正取决于无维参数 (厚度比,模量比,k31^2),而不是绝对尺寸.
- 上限校正与机电合系数 (k31^2) 有直接关系.
- 对于PZT-5单形收割机,曲刚度的校正达到17.8%,共振频率为8.5%.
- 通过考虑不均的电场,提高了材料参数识别的准确性.
结论:
- 不均电场假设对于精确建模压电能收获器至关重要.
- 开发的单模式模型为性能预测提供了一种实用和改进的方法.
- 这项工作为精确设计和描述压电能收获装置提供了基础.
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