Yang Fengshuang, Shi Yingyu, Liu Jinlong, Wang Zhicong, Tian Xiaochao
School of Mechanical and Vehicle Engineering, Changchun University, Changchun 130022, China.
China Faw Group Co., Ltd., Changchun 130011, China.
Micromachines (Basel). 2023 Jul 17;14(7):1434. doi: 10.3390/mi14071434.
In order to solve the problem of ineffective utilization of waste heat generated by energy consumption in industrial production and life, a low-frequency thermal energy conversion type piezoelectric energy trap is proposed, and relevant theoretical analysis and experimental research are conducted. The device utilizes a piezoelectric film (polyvinylidene fluoride) combined with a shape memory alloy and features a simple green structure that can supply energy to microelectronic devices. First, the structural design and working principle of the device are analyzed and the dynamics model is built. Second, COMSOL Multiphysics simulation software (Version 5.6) is used to analyze and calculate the output voltage of shape memory alloy shrinkage, piezoelectric film shape and parameters. Finally, the experimental prototype is machined and fabricated by the fine engraving machine, and the experimental platform is built for relevant performance tests. The experimental results show that when the temperature is 100 °C, the maximum strain of shape memory alloy with 1 mm diameter is 0.148 mm. When the shape of the piezoelectric film is triangular, the length of the bottom edge is equal to the height of the triangle and the thickness ratio is 0.5, the maximum output voltage is 2.12 V. The experimental results verify the feasibility of the designed device and provide new ideas for subsequent research on piezoelectric energy capture.
为解决工业生产和生活中能源消耗产生的余热利用效率低下问题，提出了一种低频热能转换型压电能量阱，并进行了相关理论分析和实验研究。该装置采用压电薄膜（聚偏氟乙烯）与形状记忆合金相结合，结构简单环保，可为微电子设备供电。首先，分析了该装置的结构设计和工作原理，建立了动力学模型。其次，利用COMSOL Multiphysics模拟软件（版本5.6）对形状记忆合金收缩、压电薄膜形状及参数的输出电压进行分析计算。最后，通过精密雕刻机加工制作了实验样机，并搭建了实验平台进行相关性能测试。实验结果表明，当温度为100℃时，直径为1mm的形状记忆合金的最大应变是0.148mm。当压电薄膜形状为三角形，底边长度等于三角形高度且厚度比为0.5时，最大输出电压为2.12V。实验结果验证了所设计装置的可行性，为后续压电能量捕获研究提供了新思路。
