STTR Phase I: Advanced Hybrid Piezoelectric Energy Harvester

小企业技术转移研究（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。虽然压电能量采集器已经发现了广泛的应用，其功率密度和机电转换效率仍然很低，在微瓦至毫瓦和10%的值，分别因为他们主要在？d31？压电换能器的模式以及振动源和采集设备之间的机械阻抗失配。据了解，？d33？模式在许多压电材料可以产生2~3倍以上的能量比？d31？模式在这个项目中，新的混合压电收割机将被设计的综合方法和独特的构造联合收割机两者结合？d31？模式和？d33？模式在一个单一的设备。这种混合设计还可以降低采集器的刚度，因此振动可以有效地从源传递到设备。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%。该项目更广泛的影响/商业潜力是开发先进的混合能量采集器，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持迫切需要自我维持的电源。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，特别是在偏远环境中。本项目开发的混合能源采集器将显着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.