摘要
为给传感器节点持续供电,提出之字形压电悬臂梁,与传统直梁结构相比,其等效加大了悬臂梁的长度,降低了固有频率。对之字形悬臂梁结构建立解析模型,对其振动进行了理论分析,通过仿真软件ANSYS对该结构进行了模态分析。仿真结果表明,在微加工工艺的尺寸限制下,8根直臂梁构成的之字形结构悬臂梁,其一阶固有振动频率小于200Hz,符合与环境振动源形成共振的条件,证明了之字形结构的有效性。
A zigzag microstructure is proposed to power sensor nodes continuously, which equivalently lengthens its length and reduces its natural frequency compared with conventional straight piezoelectric cantilever. An analyrical model is presented to study the zigzag structure vibration, an ANSYS finite element model is built, and the simulating verification is analyzed. The simulation results show that within the processing size limit of micro process technology, the first natural frequency of the structure composed of 8 straight beams is less than 200 Hz, which makes it possible to resonate with the environment vibration resource. Thus the effectiveness of the zigzag microstructure is demonstrated.
出处
《压电与声光》
CAS
CSCD
北大核心
2014年第5期735-738,共4页
Piezoelectrics & Acoustooptics
关键词
无线传感网络
压电悬臂梁
能量收集
模态分析
wireless sensor network
piezoelectric cantilever
energy harvesting
modal analysis
