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  2013, Vol. 34 Issue (2): 188-193    
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人工肌肉作动器的参数优化设计
李晖敏,何天虎
兰州理工大学
Optimization Design of Artificial Muscle Actuator by Parameters
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摘要 由于电活性聚合物材料在电场作用下所表现出的许多优异的力学性能,如大应变、响应快、能量转换率高等特点,使得这种高分子智能材料引起了广泛关注,有望被加工成作动器、传感器及俘能器等能量转换器,在工程应用中发挥巨大作用。 但是,由于描述电活性聚合物材料变形的状态方程的非线性性,及其在力电载荷作用下多种失效模式的存在,使得设计电活性聚合物能量转换器面临诸多的困难。本文针对美国人工肌肉公司(Artificial Muscle Inc.)开发的一款电活性聚合物薄膜作动器的优化设计开展研究,主要研究了不同初始预拉伸对薄膜厚度、拉伸变形、应力及电场强度等的影响效应,结果表明,在某一预拉伸下,薄膜中的电场分布将趋于均匀。本文所提供的研究方法,可为此类作动器的优化设计提供基本的分析模式。
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李晖敏
何天虎
关键词 电活性聚合物人工肌肉薄膜能量转换器预拉伸electro-active polymer artificial muscle membrane transducer prestretch    
Abstract:As a class of materias in the family of smart materias, electroactive polymers (EAPs) have attracted much attention recently due to their many unique attributes such as large strain, fast response, high energy-converting efficiency etc. in response to an applied voltage. These attributes make the EAPs promising for broad applications as actuators, sensors as well as energy harvesters in engineering. However, because of the nonlinearity of equations of states, and diverse modes of failure caused by the combination of force and voltage, modeling and designing electroactive polymer transducers have been challenging. In this paper, we focuse on investigating the opimization design of a specific actuator presented by the Artificial Muscle Inc.. The essential part of the actuaror was made of a layer of membrane of dieledtric elastomers, a specific class of EAPs. Under the action of applied force and voltage, the actuator deforms into an out-of plane axisymmetric shape. The mechanical model characterizing the out-of plane axisymmetric large deformation of the actuator is established and the corresponding state equations are formulated. The effects of initial prestretches on the thickness of the membrane, stretches, stresses and electric field are obtained and illustrates graphically. The results show that the electric field in the membrane tends to be uniform under certain set of initial prestretches. The method proposed here provides basic analysis pattern for optimization design for such actuators.
收稿日期: 2011-12-15      出版日期: 2013-04-28
基金资助:国家自然科学基金
通讯作者: 何天虎     E-mail: heth@lut.cn
引用本文:   
李晖敏 何天虎. 人工肌肉作动器的参数优化设计[J]. , 2013, 34(2): 188-193.
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