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首页> 外文会议>International Conference on Mechanical Engineering and Mechanics vol.2; 20051026-28; Nanjing(CN) >A Dynamic Hysteresis Model in Magnetostrictive Actuators
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A Dynamic Hysteresis Model in Magnetostrictive Actuators

机译：磁致伸缩执行器中的动态磁滞模型

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摘要

Magnetostrictive actuators made of Terfenol-D rods (alloys of terbium (Tb), dysprosium (Dy), and iron (Fe)) are available commercially and have such nice properties of high force, high strain (up to 2000ppm), wide bandwidth and fast response time. MicroElectroMechanical Systems (MEMS), sonar system, active vibration control, optic positioning system, and micropositioner are a few known areas in which magnetostrictive actuators can be applied. Several properties inherent to magnetostrictive materials must be considered when designing systems which employ them. The first concerns the hysteresis and nonlinear dynamics exhibited by the materials. This is considered in the control applications which require an accurate characterization of the relation between input current and displacement output by the actuators. In this paper a dynamic hysteresis in magnetostrictive actuators is presented. It is consisted of the free energy hysteresis model coupled to an ordinary different equation in an unusual way. According to its special structure, numerical implementation on the dynamic hysteresis model is provided. The resistor R_(eddy) changes according to different frequency ranges. This makes numerical implementation results reasonable throughout the discussed operating frequency range . The validity of the dynamic free energy model is illustrated by comparison with experimental data.
机译：由Terfenol-D棒（ter（Tb），（Dy）和铁（Fe）的合金）制成的磁致伸缩执行器在市场上可以买到，并且具有很高的力，高应变（高达2000ppm），宽带宽和快速的响应时间。微机电系统（MEMS），声纳系统，主动振动控制，光学定位系统和微定位器是可以在其中应用磁致伸缩致动器的一些已知领域。在设计使用磁致伸缩材料的系统时，必须考虑其固有的几个特性。首先涉及材料表现出的磁滞和非线性动力学。在控制应用中考虑了这一点，这些应用需要准确表征输入电流和执行器输出的位移之间的关系。本文提出了磁致伸缩执行器的动态磁滞现象。它由自由能磁滞模型组成，该模型以一种不寻常的方式与一个普通的不同方程式耦合。根据其特殊的结构，提供了动态滞后模型的数值实现。电阻器R_（涡流）根据不同的频率范围而变化。这使得数值实现结果在整个讨论的工作频率范围内都是合理的。通过与实验数据的比较说明了动态自由能模型的有效性。

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