三角混合两级杠杆微位移放大机构的设计及性能分析

针对压电执行器和压电驱动平台输出行程有限的问题,设计了一种三角混合两级杠杆微位移放大机构.首先,理论推导了该微位移放大机构的位移放大公式,得到了位移放大比;其次,分析了不同类型两级杠杆结构支点铰链对施加载荷的敏感性;最后,利用ANSYS软件对机构进行静力学和动力学仿真,对机构的相对寄生运动比和固有频率进行了分析.结果表...

Design and performance analysis of triangular hybrid two-stage lever micro-displacement amplification mechanism

Aiming at the limited output stroke of piezoelectric actuator and piezoelectric driving platform, a triangular hybrid two-stage lever micro-displacement amplification mechanism was designed. Firstly, the displacement amplification formula of the micro-displacement amplification mechanism was deduced theoretically, and the displacement amplification ratio was obtained; secondly, the sensitivity of fulcrum hinges of two-stage lever structure with different types to applied load was analyzed; finally, the static and dynamic simulation of the mechanism was carried out by using ANSYS software, and the relative parasitic motion ratio and natural frequency of the mechanism were analyzed. The results showed that when the straight beam hinge was selected as the fulcrum hinge of the two-stage lever structure, the mechanism was more sensitive to the applied load; the relative error between the theoretical value and the simulation value of the mechanism displacement amplification ratio was 9.56%, the relative parasitic motion ratio was 0.348 2，and the first natural frequency was the best. The designed micro-displacement amplification mechanism has relatively small parasitic displacement, relatively strong anti-interference capability and relatively good dynamic performance. The research result provides a certain theoretical guidance for the piezoelectric driver or fast mirror support structure to realize a large range of displacement output.