STTR Phase I: Advanced Hybrid Piezoelectric Energy Harvester

这项小型企业技术转移研究（STTR）第一阶段将开发先进的混合能源采集器，为无线传感器网络系统提供电力。尽管压电能量收集器已经找到了广泛的应用，但它们的功率密度和机电转换效率仍然很低，分别在微瓦到毫瓦和10%之间，因为它们主要工作在？压电换能器的模式和振动源与收获装置之间的机械阻抗不匹配。众所周知，？d33？模态在许多压电材料中可以产生2~3倍以上的能量。模式。在这个项目中，新型混合压电收割机将采用综合方法设计，并独特地将两者结合起来。Mode和？d33？单个设备的模式。这种混合设计还可以降低收割机的刚度，从而有效地将振动从源传递到设备。因此，它们将具有显著更高的功率密度和转换效率，分别为100 mW和40%。该项目的更广泛的影响/商业潜力是开发先进的混合能源采集器，可以实现无线传感器网络的广泛部署。便携式电子设备、无线传感器网络、基础设施健康监测、主动控制和战场士兵支援迫切需要自我持续供电。从环境中收集环境能量来为这些设备供电可以消除更换电池的成本，特别是在远程环境中。本项目开发的混合能量采集器将显著提高功率输出和响应动态频率，从而为许多此类设备提供足够的功率。高功率密度还将使此类传感器网络的数据采集和传输更加频繁，并促进先进传感器网络的更普遍部署。

This Small Business Technology Transfer Research (STTR) Phase I will develop advanced hybrid energy harvester to provide power for wireless sensor network systems. Although piezoelectric energy harvesters have found broad applications, their power density and mechanical-electrical conversion efficiency are still low, with values at microwatts to milliwatt and 10%, respectively since they primarily operate at the ?d31? mode of the piezoelectric transducer and the mechanical impedance mismatch between the vibration source and the harvesting device. It is known that the ?d33? mode in many piezoelectric materials can generate 2~3 times more energy than the ?d31? mode. In this project, novel hybrid piezoelectric harvesters will be designed by an integrated approach and uniquely constructed to combine both ?d31? mode and ?d33? mode in a single device. This hybrid design can also reduce the harvester stiffness so the vibration can be effectively transferred from the source to the device. Therefore, they will have significantly higher power density and conversion efficiency at 100 mW and 40%, respectively.The broader impact/commercial potential of this project is to develop advanced hybrid energy harvester that can enable broad deployment of wireless sensor networks. Self-sustainable power supply is in urgent need for portable electric devices, wireless sensor networks, infrastructure health monitoring, active control, and battleground soldier support. Scavenging ambient energy from environment to power these devices can eliminate the cost of replacing batteries, particularly in remote environment. The hybrid energy harvesters developed in this project will significantly improve the power output and response dynamic frequency, therefore provide sufficient power to many such devices. The high power density will also enable more frequent data acquisition and transmission of such sensor networks, and promote more ubiquitous deployment of advanced sensor networks.