论文标题
四点弯曲的压电能量收割机，表面应变均匀，朝着更好的能量转换性能和材料使用
Four-point bending piezoelectric energy harvester with uniform surface strain toward better energy conversion performance and material usage
论文作者
论文摘要
提高压电能量收割机的能量转化效率非常重要，一种方法是通过确保均匀的应变状态来更均匀地使用工作材料。为了取得更好的性能，本文提出了四分弯曲的压电能量收割机，并进行了广泛的研究和建模，以识别有影响力的参数。通过实验数据提出并验证了机电分析模型。频域方法提取了一般时间变化的力和影响的解决方案。将四点弯曲与标准的悬臂收割机进行比较，以产生电压的产生，机械应变和功绩图。分析并解释了针对这种创新方法的应变轮廓，并研究了最佳电阻负载的发电。引入和研究无量纲参数，以找到四点弯曲收割机的最佳工作条件。最后，讨论了四点弯曲的表现和最佳功绩，以观察收割机的长期疲劳生活。结果表明，在最佳的四点弯曲能量转换条件下；能量转换系数是典型的悬臂能量收割机的三倍以上。结果还表明，标准悬臂收割机中经历的轴向应变比四点弯曲收割机高三倍以上，这表明后一种设备可能具有良好的疲劳性能。总体而言，提出的压电收割机提高了能量转化效率，并经历了降低和均匀的表面应变，使其适合于高效的能量收集系统。
Improving the energy conversion efficiency of piezoelectric energy harvesters is of great importance, and one approach is to make more uniform use of the working material by ensuring a uniform strain state. To achieve better performance, this paper presents a four-point bending piezoelectric energy harvester with extensive investigation and modeling to identify the influential parameters. An electromechanical analytical model is presented and verified by experimental data. The frequency-domain method extracts the solutions for a general time-variable force and impact. Four-point bending is compared with the standard cantilever harvesters regarding voltage generation, mechanical strain, and figure of merit. Strain contours are analyzed and interpreted for this innovative approach, and the power generation by the optimal resistance load is studied. Dimensionless parameters are introduced and investigated to find the optimal operating conditions for the four-point bending harvester. Finally, the four-point bending performance and the best figure of merit are discussed with a view to the long-term fatigue life of the harvester. The results show that in the best four-point bending energy conversion conditions; the energy conversion coefficient is more than three times higher than that of typical cantilever energy harvesters. The results also illustrate that the axial strain experienced in a standard cantilever harvester is more than three times higher than that of the four-point bending harvester, suggesting the latter device may have favorable fatigue performance. Overall, the presented piezoelectric harvester has improved energy conversion efficiency and experiences a reduced and uniform surface strain, making it appropriate for high-efficiency energy harvesting systems.
