Broadband Vibrational Energy Harvesting

宽带振动能量收集

• 批准号: 1131052
• 负责人: Jeffrey Moehlis
• 金额: $ 32.25万
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-10-01 至 2015-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1131052&HistoricalAwards=false
• 关键词: Broadband; Vibrational; Energy; Harvesting

Energy harvesters are a promising technology for capturing useful energy from the environment or a device's operation. This research will develop and implement a novel energy harvester design for capturing vibrational energy in environments with a broad ambient vibration frequency spectrum. The design uses flexible ceramic piezoelectric elements that produce electricity when mechanically strained, which are in a buckled state at equilibrium. Preliminary experimental results show that a harvester with this design can output appreciable power over a broad range of forcing frequencies, unlike harvesters of vibrational energy based on linear mechanical principles which only give appreciable response if the dominant ambient vibration frequency is close to the resonance frequency of the harvester. The proposed work includes the experimental characterization of this device for periodic and stochastic forcing, plus the development of low- and high-dimensional models that will be analyzed theoretically and computationally. Particular attention will be paid to parameter and forcing regimes for which there is chaotic response, since the preliminary experimental results suggest that this is where the energy harvesting could be maximized. The dependence of the response on parameters will be determined, and multiparameter optimization will be used to identify parameter values for the device for which the energy harvesting is optimized.Vibrational energy harvesters have potential application in a variety of environments which produce considerable vibrational energy, such as automobiles, trains, aircraft, watercraft, machinery, and buildings. Energy harvesters could power auxiliary functions for such systems, for example the wireless transmission of data for system monitoring. Furthermore, many mechanical and electronic systems such as autonomous vehicles and sensor networks require bulky batteries and/or power supplies for their operation. If energy harvesters could be used to provide complete or supplementary power for such systems, they could function with reduced cost and inconvenience of replacing their batteries. This work will also develop a rigorous modeling framework for piezoelectric vibrational energy harvesters which will be beneficial for other researchers working in this and other areas for which both piezoelectric and mechanical effects are important.

能量收集器是一种很有前途的技术，可以从环境或设备的运行中获取有用的能量。这项研究将开发和实施一种新型的能量收集器设计，用于在环境振动频谱较宽的环境中捕获振动能量。该设计使用了柔性陶瓷压电元件，当机械应变时，这些元件会产生电能，在平衡时处于弯曲状态。初步实验结果表明，与基于线性机械原理的振动能量收割机不同，这种设计的收割机可以在较宽的强迫频率范围内输出可观的功率，而只有当环境的主要振动频率接近收割机的共振频率时，才会产生明显的响应。拟议的工作包括对这种装置进行周期性和随机强迫的实验表征，以及开发将从理论和计算上进行分析的低维和高维模型。由于初步实验结果表明，这是能量收集可以最大化的地方，因此将特别注意存在混沌响应的参数和强迫区域。振动能量采集器在汽车、火车、飞机、船舶、机械和建筑物等产生大量振动能量的环境中具有潜在的应用价值。能源收割机可以为这类系统的辅助功能提供动力，例如为系统监控提供无线数据传输。此外，许多机械和电子系统，如自动驾驶汽车和传感器网络，需要庞大的电池和/或电源来运行。如果能量收集器能够为这种系统提供完整或补充的电力，它们可以以更低的成本和更换电池的不便发挥作用。这项工作还将为压电振动能量采集器建立一个严格的建模框架，这将有助于其他研究人员在这一领域和其他领域的工作，对压电效应和机械效应都很重要。