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首页> 外文期刊>Mechatronics, IEEE/ASME Transactions on >Large Effective-Strain Piezoelectric Actuators Using Nested Cellular Architecture With Exponential Strain Amplification Mechanisms
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Large Effective-Strain Piezoelectric Actuators Using Nested Cellular Architecture With Exponential Strain Amplification Mechanisms

机译：大型有效应变压电致动器，采用具有指数应变放大机制的嵌套细胞结构

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摘要

Design and analysis of piezoelectric actuators having over 20% effective strain using an exponential strain amplification mechanism are presented in this paper. Piezoelectric ceramic material, such as lead zirconate titanate (PZT), has large stress and bandwidth, but its extremely small strain, i.e., only 0.1%, has been a major bottleneck for broad applications. This paper presents a new strain amplification design, called a “nested rhombus” multilayer mechanism, that increases strain exponentially through its hierarchical cellular structure. This allows for over 20% effective strain. In order to design the whole actuator structure, not only the compliance of piezoelectric material but also the compliance of the amplification structures needs to be taken into account. This paper addresses how the output force and displacement are attenuated by the compliance involved in the strain amplification mechanism through kinematic and static analysis. An insightful lumped parameter model is proposed to quantify the performance degradation and facilitate design tradeoffs. A prototype-nested PZT cellular actuator that weighs only 15 g has produced 21% effective strain (2.5 mm displacement from 12-mm actuator length and 30 mm width) and 1.7 N blocking force.
机译：本文介绍了使用指数应变放大机制设计和分析具有超过20％有效应变的压电致动器。压电陶瓷材料，例如锆钛酸铅（PZT），具有较大的应力和带宽，但是其极小的应变（即仅为0.1％）已成为广泛应用的主要瓶颈。本文提出了一种新的应变扩增设计，称为“嵌套菱形”多层机制，该机制通过其分层细胞结构以指数方式增加了应变。这允许超过20％的有效应变。为了设计整个致动器结构，不仅需要考虑压电材料的柔度，而且还需要考虑放大结构的柔度。本文通过运动学和静态分析研究了应变放大机制所涉及的顺应性如何衰减输出力和位移。提出了一个有见地的集总参数模型，以量化性能下降并促进设计权衡。仅重15 g的原型嵌套式PZT蜂窝执行器产生了21％的有效应变（12 mm执行器长度和30 mm宽度相距2.5 mm位移）和1.7 N阻塞力。

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