电活性膜的气动响应分析

Mohammad Khairul Habib Pulok, Pratik Sarker, U. Chakravarty
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摘要

介电弹性体膜是一类电活性聚合物,由夹在两个柔性电极之间的薄弹性体膜组成。当电极上有一个外部施加的电压时,静电压力就产生了,该电压在厚度方向上产生压缩,在平面内方向上产生延伸。这概述了膜张力的变化,可以用来改变其动态行为。本研究以电活性膜VHB 4910为试样,观察外气流作用下膜的气动特性。通过实验和数值分析,预测了不同迎角下试件的流固耦合行为。利用振动测试装置估计了振动频率和模态振型,并通过有限元结果进行了验证。研究发现,升力系数随着迎角的增大而增大,直至一个临界值。同样,阻力系数随着迎角的增大而增大。升力系数和阻力系数随雷诺数的增加而减小。随着外加电压的升高,固有频率的幅度减小。膜的固有频率和模态振型可以通过改变预张力、压力和/或电压来调节。
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An Analysis of the Aerodynamic Response of an Electroactive Membrane
Dielectric elastomer membranes are a category of electroactive polymers composed of a thin elastomer film sandwiched between two compliant electrodes. An electrostatic pressure is created when there is an externally applied voltage on the electrodes which creates compression in the thickness direction and extension in the in-plane direction. This outlines a variation of the tension in the membrane that can be used to change its dynamic behavior. In this study, a specimen of an electroactive membrane, VHB 4910 is considered to observe the aerodynamic characteristics under external flow of air. Both experimental and numerical analyses are performed to predict the fluid-structure interaction behavior of the specimen for different angles of attack. A vibration testing arrangement is used to estimate the resonance frequencies and the mode shapes which are validated by the finite element results. From the study, the coefficient of lift is found to increase with the angle of attack up to a critical value. Similarly, the coefficient of drag increases with the angle of attack. Both lift and drag coefficients decrease with the Reynolds number. The magnitudes of the natural frequencies decrease as the applied voltages rise. The natural frequencies and mode shapes of the membrane can be tuned by changing the pretension, the pressure, and/or the voltage.
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