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工程设计学报
Chin J Eng Design  2022, Vol. 29 Issue (2): 161-167    DOI: 10.3785/j.issn.1006-754X.2022.00.019
Innovative Design     
Design and performance analysis of triangular hybrid two-stage lever micro-displacement amplification mechanism
Fei FENG1(),Yu-chen FU2,Wei FAN2,Ju MA2
1.Longyan Technician College, Longyan 364000, China
2.College of Mechanical Engineering and Automation, Huaqiao University, Xiamen 361021, China
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Abstract  

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.

Key words： triangular hybrid two-stage lever      finite element analysis      parasitic displacement      natural frequency     
Received: 26 April 2021      Published: 06 May 2022
CLC:  TH 12  
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Fei FENG
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Cite this article:

Fei FENG,Yu-chen FU,Wei FAN,Ju MA. Design and performance analysis of triangular hybrid two-stage lever micro-displacement amplification mechanism. Chin J Eng Design, 2022, 29(2): 161-167.

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https://www.zjujournals.com/gcsjxb/10.3785/j.issn.1006-754X.2022.00.019     OR     https://www.zjujournals.com/gcsjxb/Y2022/V29/I2/161


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。结果表明：当选取直梁形铰链作为两级杠杆结构的支点铰链时，机构对施加载荷的敏感性较强；机构位移放大比理论值与仿真值的相对误差为9.56%，相对寄生运动比为0.348 2，且1阶固有频率最佳。所设计的微位移放大机构具有较小的寄生位移、较强的抗干扰能力和较好的动力学性能。研究结果为压电驱动器或快速反射镜支撑结构实现大量程的位移输出提供了一定的理论指导。


关键词： 三角混合两级杠杆,  有限元分析,  寄生位移,  固有频率 
Fig.1 Structure of triangular hybrid two-stage lever micro-displacement amplification mechanism
Fig.2 Schematic of working principle of triangular hybrid two-stage lever micro-displacement amplification mechanism
Fig.3 Schematic of working principle of triangular structure and two-stage lever structure
参数tRdL1L2L3L6
数值0.41.252.52081020
Table 1 Structural parameters of triangular hybrid two-stage lever micro-displacement amplification mechanism
输入载荷/MPa最大应力/MPa最大输出位移/um
直圆形铰链直圆长形铰链直梁形铰链直圆形铰链直圆长形铰链直梁形铰链
0.494.471111.49121.0854.94182.67385.379
0.8188.94222.99242.17109.88146.97170.76
1.2283.41334.48363.25164.82248.02256.14
1.6377.88445.97484.34219.76330.69341.52
2.0472.36557.47605.42274.70413.36426.89
Table 2 Finite element simulation results of maximum stress and maximum output displacement of triangular hybrid two-stage lever micro-displacement amplification mechanism under different input loads
Fig.4 Maximum stress and maximum output displacement of triangular hybrid two-stage lever micro-displacement amplification mechanism with input load of 20 MPa
Fig.5 Stress nephogram and total output displacement of triangular hybrid two-stage lever micro-displacement amplification mechanism when Δx=10 μm
Fig.6 The first six modes of triangular hybrid two-stage lever micro displacement amplification mechanism
模态第1阶第2阶第3阶第4阶第5阶第6阶
固有频率305.90376.43413.20471.481 098.201 163.40
Table 3 Natural frequency of triangular hybrid two-stage lever micro displacement amplification mechanism
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