Exact constraint design of bridge-type displacement flexure amplifier

IF 4.5 1区工程技术 Q1 ENGINEERING, MECHANICAL

Mechanism and Machine Theory Pub Date : 2024-09-25 DOI:10.1016/j.mechmachtheory.2024.105799

Guimin Chen, Haoyu Zhang, Ruiyu Bai, Bo Li

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引用次数: 0

Abstract

Bridge-type amplifiers are commonly used to increase the effective actuation stroke of piezoelectric stack actuators owing to their compact size. However, the traditional bridge-type amplifier has an unconstrained degree-of-freedom, which yields large parasitic motions when subject to offset loads and induces dynamic performance losses related to underconstrained resonance. This work presents an exact constraint design (ECD) of bridge-type amplifier, in which a semi-bridge is introduced for both the lower bridge and the upper bridge on the basis of the traditional bridge-type amplifier. A holistic theoretical model is established for the whole bridge-type amplifier without reducing it to a half or even a quarter by taking advantage of structural symmetry. The model is generalized so that it can be used for modeling the traditional, the compound and the ECD amplifiers. Based on the model, three different bridge-type amplifiers considering manufacturing errors are modeled and compared, and the results show that the ECD amplifier is more precise in achieving desired motion and more robust against manufacturing imperfections. All the results are verified by those of the finite element models.

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桥式位移挠性放大器的精确约束设计

桥式放大器由于体积小巧，通常用于增加压电叠层致动器的有效致动冲程。然而，传统的桥式放大器具有无约束自由度，在承受偏移负载时会产生较大的寄生运动，并导致与无约束共振有关的动态性能损失。本研究提出了桥式放大器的精确约束设计（ECD），在传统桥式放大器的基础上，为下桥和上桥引入了半桥。利用结构对称性，为整个桥式放大器建立了一个整体理论模型，而没有将其简化为半桥甚至四分之一桥。该模型具有通用性，可用于传统、复合和 ECD 放大器的建模。结果表明，ECD 放大器在实现理想运动方面更加精确，对制造缺陷的抵抗能力更强。所有结果都得到了有限元模型的验证。

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来源期刊

Mechanism and Machine Theory 工程技术-工程：机械

CiteScore

9.90

自引率

23.10%

发文量

450

审稿时长

20 days

期刊介绍： Mechanism and Machine Theory provides a medium of communication between engineers and scientists engaged in research and development within the fields of knowledge embraced by IFToMM, the International Federation for the Promotion of Mechanism and Machine Science, therefore affiliated with IFToMM as its official research journal. The main topics are: Design Theory and Methodology; Haptics and Human-Machine-Interfaces; Robotics, Mechatronics and Micro-Machines; Mechanisms, Mechanical Transmissions and Machines; Kinematics, Dynamics, and Control of Mechanical Systems; Applications to Bioengineering and Molecular Chemistry