Zhou Kuiyong, Liu Pengbo, Lu Shuaishuai, Yan Peng
School of Mechanical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China.
Key Laboratory of High-efficiency and Clean Mechanical Manufacture (Shandong University), Ministry of Education, School of Mechanical Engineering, Shandong University, Jinan, Shandong 250061, China.
Rev Sci Instrum. 2022 Feb 1;93(2):025005. doi: 10.1063/5.0076287.
Owing to the limited stroke of piezo stacks, compliant amplification mechanisms are widely employed to magnify the displacement of piezoelectric actuators for emerging applications in precision engineering. In this study, a three-dimensional (3D) bridge-type amplification mechanism composed of two serially connected bridge-type amplifiers with a novel constraint form has been developed. The parallel guiding beams mounted at the input and output ends significantly increase the lateral stiffness and minimize parasitic displacements for higher accuracy. Furthermore, a new theoretical model is established to predict the magnification behavior of the 3D amplifier that takes into account the displacement loss caused by the coupling of the two bridge-type amplifiers. The accuracy of this model and the mechanical performance of the developed amplifier are verified by conducting finite element simulations and experimental studies on the manufactured prototypes.
由于压电叠堆的行程有限，柔顺放大机构被广泛应用于放大压电致动器的位移，以满足精密工程中新兴应用的需求。在本研究中，开发了一种三维（3D）桥式放大机构，它由两个串联的具有新型约束形式的桥式放大器组成。安装在输入端和输出端的平行导向梁显著提高了横向刚度，并将寄生位移降至最低，从而实现更高的精度。此外，还建立了一个新的理论模型来预测3D放大器的放大行为，该模型考虑了两个桥式放大器耦合引起的位移损失。通过对制造的原型进行有限元模拟和实验研究，验证了该模型的准确性和所开发放大器的机械性能。
