A finite element model for bending behaviour of conducting polymer electromechanical actuators
A finite element model for bending behaviour of conducting polymer electromechanical actuators
复制标题
导电聚合物机电执行器弯曲行为的有限元模型
DOI：
10.1016/j.sna.2005.12.010
复制
发表时间：
2006
影响因子：
4.6
通讯作者：
G. Spinks
中科院分区：
文献类型：
--
作者：
P. Metz;G. Alici;G. Spinks
新兴的导电聚合物机电致动器(CPEA)具有从生物医学到微/纳米操纵系统的许多潜在应用。为了利用它们的潜力，需要建立一个有效的数学模型，以提高对业绩的了解程度、可预测性、可控性和效率。虽然人们知道它们运行背后的机制相当简单，但建立一个数学模型来预测它们的行为并量化它们的性能受到许多机械、电气和化学参数的阻碍。考虑到这一点，本研究的目的是建立并实验验证弯曲型聚吡咯(PPy)执行器的集中参数模型，以用于改善其位移和力输出。根据PPy驱动器的工作原理，将其体积变化引起的热应变与实际应变进行类比，建立了结构/热耦合的数学模型。采用有限元方法对模型进行求解。用温度分布模型模拟了离子迁移到PPy层中的传播效应。理论和实验结果表明，在一定的输入电压范围和PPy层厚度范围内，该模型能够很好地预测PPy驱动器的弯曲角和弯矩输出。
Emerging conducting polymer electromechanical actuators (CPEA) have many potential applications ranging from biomedical to micro/nano manipulation systems. In order to make use of their potential, it is needed to establish a valid mathematical model to provide enhanced degrees of understanding, predictability, control and efficiency in performance. Although it is known that the mechanism behind their operation is quite straightforward; establishing a mathematical model to predict their behaviours and quantify their performance is hampered by many mechanical, electrical and chemical parameters. With this in mind, the aim of this study is to establish and experimentally validate a lumped-parameter model of bending-type polypyrrole (PPy) actuators for use in improving their displacement and force outputs. With reference to their operation principle, we draw an analogy between the thermal strain and the real strain in the PPy actuators due to the volume change to set up the mathematical model, which is a coupled structural/thermal model. The finite element method (FEM) is used to solve the model. The effect of propagation of the ion migration into the PPy layers is mimicked with a temperature distribution model. Theoretical and experimental results demonstrate that the model is practical and effective enough in predicting the bending angle and bending moment outputs of the PPy actuators quite well for a range of input voltages, and the PPy layer thicknesses.