Ding Yan, Lai Lei-Jie
School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai 201620, China.
Rev Sci Instrum. 2019 Jun;90(6):065102. doi: 10.1063/1.5091672.
To improve the load capacity of flexure-based amplification mechanisms, a flexure-based displacement amplification mechanism is developed in this study by combining the bridge-type and the Scott-Russell mechanisms. The four arms of the traditional bridge mechanism are replaced by four Scott-Russell mechanisms that provide the advantages of good symmetry, compact structure, and higher load capacity. An analytical model is formulated using a stiffness matrix to analyze the natural frequency, input and output stiffnesses, displacement amplification ratio, and load capacity of the proposed mechanism. The design model was subjected to both experimental methods and finite element analysis for verification, and the two sets of results were in good agreement. This proves the effectiveness and applicability of the analytical model and the proposed amplification mechanism. The output stiffnesses of the modified bridge-type amplifier and the traditional bridge-type amplifier are 0.158 N/μm and 0.041 N/μm, respectively, indicating excellent load performance of the modified bridge-type amplifier.
为提高基于柔性铰链的放大机构的承载能力，本研究通过结合桥式机构和斯科特-拉塞尔机构，开发了一种基于柔性铰链的位移放大机构。传统桥式机构的四个臂被四个斯科特-拉塞尔机构取代，这些机构具有对称性好、结构紧凑和承载能力更高的优点。使用刚度矩阵建立了一个解析模型，以分析所提出机构的固有频率、输入和输出刚度、位移放大比和承载能力。对设计模型进行了实验方法和有限元分析验证，两组结果吻合良好。这证明了解析模型和所提出放大机构的有效性和适用性。改进后的桥式放大器和传统桥式放大器的输出刚度分别为0.158N/μm和0.041N/μm，表明改进后的桥式放大器具有优异的负载性能。
