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收割机，为无线传感器网络系统提供电力。虽然压电能量采集器应用广泛，但其功率密度和机电转换效率仍然较低，由于其主要工作在？d31？压电式换能器的模式和振动源与采集装置之间的机械阻抗不匹配。据了解，D33？在许多压电材料中，模式产生的能量是？D31？模式。在本项目中，将以集成的方法设计新型混合式压电收割机，并将其独特地构造为结合？D31？？MODE和？D33？在单个设备中设置模式。这种混合设计还可以降低收割机的刚度，从而可以有效地将振动从源传递到设备。因此，它们将分别在100兆瓦和40%时具有显著更高的功率密度和转换效率。该项目更广泛的影响/商业潜力是开发能够广泛部署无线传感器网络的先进混合动力能量收集器。自给自足的电力供应迫切需要便携式电子设备、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持。从环境中回收环境能量为这些设备供电，可以消除更换电池的成本，特别是在偏远环境中。本项目开发的混合动力能量收集器将显著提高功率输出和响应动态频率，从而为许多此类装置提供足够的功率。高功率密度还将使此类传感器网络能够更频繁地采集和传输数据，并促进更无处不在的先进传感器网络的部署。

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.