宽频激励下双稳态压电振动发电机供电能力分析

Power supply capability analysis of piezoelectric vibration generator with bistable under wide frequency excitation

为了探讨双稳态压电振动发电机在宽频激励下的供电能力问题,建立了宽频激励下双稳态压电振动发电机系统的动力学模型,仿真了双稳态压电振动发电机系统的输出响应特性和不同运动状态的输出电压特性,研究了双稳态压电振动发电机系统运行在高能量轨道上的激励条件,据此优化双稳态压电振动发电机结构参数,并对传感器网络节点的用电需求和双稳态压电振动发电机的供电能力进行分析。仿真和实验结果表明:双稳态压电振动发电机在宽频激励下,其输出平均功率为3.8 m W,能够满足实际振动环境下无线传感器网络节点的用电需求。

In order to explore a piezoelectric vibration generator with bistable supplying power for the wire- less sensor node under wide frequency excitation, dynamical model under random vibration excitation was built. And accordingly the piezoelectric vibration generator was simulated with bistable output response and voltage under different motion state. The incentive condition of the piezoelectric vibration generator was explored with bistable running in high energy orbit. Structure parameters of the piezoelectric vibration generator with bistable were optimized. Electricity demand of sensor network nodes and power produetion ability of piezoelectric vibration generator with bistable were analyzed. The results of imitation and experi- ment indicate that the output average power of the piezoelectric vibration generator with bistable is about 3.8 mW under the specific frequency band excitation. It is able to meet the power demand of the wireless sensor network node.