Dynamic modeling of a fish tail actuated by IPMC actuator based on the absolute nodal coordinate formulation

执行机构 梁(结构) 曲率 流离失所(心理学) 电压 变形(气象学) 刚度 材料科学 结构工程 机械 控制理论(社会学) 工程类 物理 计算机科学 几何学 电气工程 复合材料 数学 人工智能 心理治疗师 控制(管理) 心理学
作者
Liang Li,Xian Guo,Ye Liu,Dingguo Zhang,Wei‐Hsin Liao
出处
期刊:Smart Materials and Structures [IOP Publishing]
卷期号:31 (11): 115005-115005 被引量:3
标识
DOI:10.1088/1361-665x/ac8c0a
摘要

Abstract Ionic polymer metal composite (IPMC) is a smart material with low driving voltage, high energy conversion, light weight and simple structure. It is suitable for driving the tail fin of small bionic fish. Actuators made of this material are quite flexible, and they are laborious to accurately describe the complex deformation of structures. Absolute nodal coordinate formulation (ANCF) has great merits in describing large deformation and large displacement problems. In this paper, the feasibility of ANCF in dynamic modeling of a fish tail actuated by IPMC actuator will be explored for the first time. The tail fin is simplified into two forms: a pure flexible IPMC beam and a hybrid beam that consists of an IPMC beam and a fixed rigid beam. The ANCF one-dimensional two-node beam element is adopted. Considering the influence of deformation curvature, the exact expression of generalized elastic force is obtained. The proposed dynamic model can describe the large deformation problem of the flexible beam. The dynamic responses of the pure IPMC beam tail fin and the hybrid tail fin driven by square wave voltage are calculated. The displacement changes of end nodes are compared, and the swing law under different driving voltage amplitude, frequency, and fluid resistance is analyzed. It is found that the driving efficiency of IPMC can be improved by increasing the driving voltage amplitude, reducing the voltage frequency, and reducing the fluid resistance in a certain range. This research would be beneficial to the study of the large swing motion mechanism of bionic robotic fish.
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