Department of Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
Sensors (Basel). 2022 Jun 13;22(12):4457. doi: 10.3390/s22124457.
Vibration-based energy harvesters consisting of a laminated piezoelectric cantilever have recently attracted attention for their potential applications. Current studies have mostly focused on the harvesting capacity of piezoelectric harvesters under various conditions, and have given less attention to the electromechanical characteristics that are, in fact, crucial to a deeper understanding of the intrinsic mechanism of piezoelectric harvesting. In addition, the current related models have mostly been suitable for harvesting systems with very specific parameters and have not been applicable if the parameters were vague or unknown. Drawing on the available background information, in this study, we conduct research on a vibration-based cantilever beam of composite-laminated piezoelectric patches through an experimental study of its characteristics as well as a modeling study of energy harvesting. In the experimental study, we set out to investigate the harvesting capacity of the system, as well as the electromechanical (voltage/current-strain and power-strain relationships) characteristics of the cantilever harvester. In addition, we summarize some pivotal rules with regard to several design variables, which provide configuration design suggestions for maximizing energy conversion of this type of harvesting system. In the modeling study, we propose a coupled electromechanical model with a set of updated parameters by using an optimization program. The preceding experimental data are used to verify the superiority of the model for accurately predicting the amount of harvested energy, while effectively imitating the characteristics of a cantilever harvesters. The model also has merit since it is suitable for diversified harvesters with vague or even unknown parameters, which cannot be dealt with by using traditional modeling methods. Overall, the experimental study provides information on a comprehensive way to enhance the harvesting capacity of piezoelectric cantilever transducers, and the modeling study provides a wide scope of applications for cantilever harvesters even if precise information is lacking.
基于层压压电悬臂梁的振动能量收集器最近因其潜在应用而受到关注。目前的研究主要集中在各种条件下压电收集器的收集能力上，而对机电特性的关注较少，实际上机电特性对深入了解压电收集的内在机制至关重要。此外，目前相关的模型大多适用于具有非常特定参数的收集系统，如果参数模糊或未知，则不适用。利用现有的背景信息，在这项研究中，我们通过对复合材料层压压电贴片的悬臂梁振动特性的实验研究和能量收集的建模研究来进行研究。在实验研究中，我们旨在研究系统的收集能力，以及悬臂收集器的机电（电压/电流-应变和功率-应变关系）特性。此外，我们总结了一些关于几个设计变量的关键规则，这些规则为最大化这种收集系统的能量转换提供了配置设计建议。在建模研究中，我们通过使用优化程序提出了一个带有一组更新参数的耦合机电模型。前面的实验数据用于验证该模型在准确预测收集能量方面的优越性，同时有效地模仿悬臂收集器的特性。该模型的优点还在于，它适用于具有模糊甚至未知参数的多样化收集器，而传统的建模方法无法处理这些参数。总的来说，实验研究提供了一种全面的方法来提高压电悬臂换能器的收集能力，而建模研究则为悬臂收集器提供了广泛的应用范围，即使缺乏精确的信息。
