基于梯形压电悬臂梁的折线形结构振动能量采集装置  

A vibration energy acquisition device of broken line structure based on trapezoidal piezoelectric cantilever

作　　者：王志豪 王丽坤[1,2] 廖擎玮 WANG Zhihao;WANG Likun;LIAO Qingwei(School of Instrument Science and Optoelectronic Engineering,Beijing Information Science&Technology University,Beijing 100192,China;Beijing Key Laboratory of Sensors,Beijing Information Science&Technology University,Beijing 100192,China)

机构地区：[1]北京信息科技大学仪器科学与光电工程学院,北京100192 [2]北京信息科技大学传感器北京市重点实验室,北京100192

出　　处：《北京信息科技大学学报（自然科学版）》2022年第1期1-5,13,共6页Journal of Beijing Information Science and Technology University

基　　金：国家自然科学基金资助项目(61871043)。

摘　　要：提出了一种用于环境振动能量收集的新型振动微能量采集装置。该装置由一个梯形悬臂梁与折线形结构复合组成:折线形结构包含两个分离的质量块,可提供较大的转动惯量,并在梯形悬臂梁的自由端产生弯矩;悬臂梁部分由梯形不锈钢基板与自制PZT-5压电陶瓷组成,其中PZT-5采用固态法制备,它的压电常数d_(33)为512 pC/N,平面机电耦合系数k_(p)为0.69。振动功率输出测量实验表明,通过选择两个质量块合适的质量比,可以使梯形悬臂梁的纵向应变分布趋向均匀,并且使得整体结构在不同振动模态下的输出表现更为优秀。A new vibration micro-energy acquisition device is proposed for environmental vibration energy collection.The device is composed of a trapezoidal cantilever beam and a broken line structure:the broken line structure contains two separated mass blocks,which can provide large moments of inertia and generate bending moment at the free end of the trapezoidal cantilever beam.The cantilever beam is composed of trapezoidal stainless steel substrate and self-made PZT-5 piezoelectric ceramics,among which the PZT-5 is prepared by the solid-state method.Its piezoelectric constant d_(33) is 512 pC/N and plane electromechanical coupling coefficient k_(p) is 0.69.The vibration power output measurement experiment shows that the longitudinal strain distribution of the trapezoidal cantilever beam tends to be uniform,and the output performance of the whole structure is better under different vibration modes by selecting the appropriate mass ratio of two mass blocks.

关 键 词：微能量采集 压电陶瓷 振动 悬臂梁 

分 类 号：O321[理学—一般力学与力学基础]