Zhou Shuai, Yan Peng
Key Laboratory of High-Efficiency and Clean Mechanical Manufacture, Ministry of Education, School of Mechanical Engineering, Shandong University, Jinan 250061, China.
Micromachines (Basel). 2023 Jan 27;14(2):322. doi: 10.3390/mi14020322.
In this study, a compliant amplifier powered by a piezoelectric stack is designed to meet high-performance dispensing operation requirements. By studying the issue of low frequency bandwidth on the traditional bridge-type amplifier mechanism, we propose a displacement amplifier mechanism, hybrid bridge-lever-bridge (HBLB), that enhances its dynamic performance by combining the traditional bridge-type and lever mechanism. A guiding beam is added to further improve its output stiffness with a guaranteed large amplification ratio. An analytical model has been developed to describe the full elastic deformation behavior of the HBLB mechanism that considers the lateral displacement loss of the input end, followed by a verification through a finite element analysis (FEA). Results revealed that the working principle of the HBLB optimizes the structural parameters using the finite element method. Finally, a prototype of the displacement amplifier was fabricated for performance tests. Static and dynamic test results revealed that the proposed mechanism can reach a travel range of 223.2 μm, and the frequency bandwidth is 1.184 kHz, which meets the requirements of a high-performance piezo jet dispenser.
在本研究中，设计了一种由压电叠堆驱动的柔顺放大器，以满足高性能点胶操作要求。通过研究传统桥式放大器机构的低频带宽问题，我们提出了一种位移放大机构，即混合桥式-杠杆式-桥式（HBLB），通过结合传统桥式和杠杆机构来提高其动态性能。增加了一根导向梁，以在保证较大放大比的情况下进一步提高其输出刚度。建立了一个解析模型来描述HBLB机构的全弹性变形行为，该模型考虑了输入端的横向位移损失，随后通过有限元分析（FEA）进行了验证。结果表明，HBLB的工作原理利用有限元方法优化了结构参数。最后，制作了位移放大器的原型进行性能测试。静态和动态测试结果表明，所提出的机构行程范围可达223.2μm，频率带宽为1.184kHz，满足高性能压电喷射点胶机的要求。
