压电悬臂梁负载阻抗匹配分析及其在隔膜泵驱动中的应用  

Load impedance matching analysis of piezoelectric cantilever beam and its application in diaphragm pump driving

作　　者：张柯 安超 高玉志 刘永斌[1] 琚斌 ZHANG Ke;AN Chao;GAO Yu-zhi;LIU Yong-bin;JU Bin(College of Electrical Engineering and Automation,Anhui University,Hefei 230601,China)

机构地区：[1]安徽大学电气工程与自动化学院,安徽合肥230601

出　　处：《机电工程》2023年第3期353-360,共8页Journal of Mechanical & Electrical Engineering

基　　金：国家自然科学基金面上项目(52175529)。

摘　　要：利用悬臂梁结构的不同位置作为对外激励源时,为了使负载获得更多的能量,使悬臂梁的能量输出达到最优,同时隔膜泵的流量输出达到最大,实现隔膜刚度最佳匹配的目的,提出了一种压电驱动悬臂梁结构的负载阻抗匹配概念,研究了隔膜泵的性能与悬臂梁结构对外输出刚度之间的关系。首先,选取悬臂梁结构的根部、中部和端部3个特征位置,利用有限元仿真软件,对悬臂梁-弹簧-质量块模型的能量输出进行了阻抗匹配分析;其次,选取隔膜容积泵作为驱动负载,根据其结构及工作原理,建立了压电悬臂梁驱动隔膜容积泵的简化动力学模型,分析了隔膜泵的性能与悬臂梁驱动结构参数之间的关系;最后,搭建了压电悬臂梁驱动隔膜泵的刚度匹配实验平台,对不同圆盘直径下,悬臂梁不同特征位置处的隔膜泵输出流量进行了测试。研究结果表明:在悬臂梁根部、中部以及端部位置处,隔膜泵输出流量最大时的活塞圆盘直径分别为20 mm、18 mm以及16 mm,随着悬臂梁不同位置对外输出刚度的减小,隔膜匹配的最佳刚度应随之减小;若悬臂梁结构与负载参数一定时,对应的最佳负载匹配刚度逐渐增大。When using different positions of the cantilever beam cantilever structure as the external excitation source,in order to obtain more energy from the load,the energy output of the cantilever beam was optimized,the flow output of the diaphragm pump was maximized,and the purpose of optimal matching of diaphragm stiffness was achieved,the relationship between the performance of diaphragm pump and the external output stiffness of cantilever beam structure was studied.Firstly,three feature positions of the root,middle and end of the cantilever structure were selected.The energy output impedance matching of the cantilever spring mass model was analyzed by using the finite element simulation software.Then,the diaphragm positive displacement pump was selected as the driving load,and the simplified dynamic model of the diaphragm positive displacement pump driven by piezoelectric cantilever beam was established by using its structure and working principle.The relationship between the performance of the diaphragm pump and the structural parameters of the cantilever was analyzed by using the model.Finally,the output flow of diaphragm pump at different feature position of cantilever beam with different disc diameters was tested by building an experimental platform for stiffness matching of piezoelectric cantilever beam driven diaphragm pump.The results show that the diameter of the piston disc at the root,middle and end of the cantilever beam is 20 mm,18 mm and 16 mm respectively when the output flow of the diaphragm pump is maximum.With the decrease of the output stiffness at different positions,the optimal stiffness of the diaphragm matching can be reduced.The cantilever structure and load parameters remain unchanged while the corresponding optimal load matching stiffness gradually increases.

关 键 词：隔膜容积泵 悬臂梁能量输出 隔膜泵流量输出 隔膜刚度最佳匹配 特征位置 悬臂梁-弹簧-质量块模型 驱动负载 

分 类 号：TH323[机械工程—机械制造及自动化] TB535[理学—物理]