摘要
为了预测基于悬臂梁结构的振动式压电发电机的固有频率、输出电压和输出功率等关键参数,通过理论分析得到了悬臂梁式压电发电机的理论模型,该模型比Roundy模型与试验结果更加吻合。针对故障诊断无线传感节点瞬时功率大、平均功率小的特点,设计了基于多振子的功率调节电路,当主回路超级电容器储存的电能可以使无线传感节点正常工作时,将主回路打开,开始进行测量和向监测中心传送数据。在轮船发动机上进行的现场试验表明振动式压电发电机可以为无线传感器节点供电。
The mathematical model of the vibration-based piezoelectric generator with the proof mass supported by a cantilever is established. The formulas of the frequency, the output voltage and the output power are derived. Testing results show that this model is more accurate than Roundy＇s model. According to such characters as large transient power and small average power of the typical wireless sensor node, the power self-regulation circuit of the piezoelectric multi-shaker micro-generator is proposed. When the electricity in the super capacitor of the main circuit is enough to power the wireless sensor node, the main circuit is opened by the ancillary return circuit and the node starts to measure and transfer the results to the monitoring center. The field test on an engine of a ship shows that the vibration-based piezoelectric generator can be used to power a wireless sensor node.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2008年第11期75-79,共5页
Journal of Mechanical Engineering
基金
国家高技术研究发展计划(863计划
2005AA404280)资助项目
关键词
振动式压电发电机
数学模型
功率调节电路
无线传感节点
Vibration-based piezoelectric generator Mathematical model Power self-regulation circuit Wireless sensor node
