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Theoretical study of the electromechanical efficiency of a loaded tubular dielectric elastomer actuator

机译：加载管状电介质弹性体致动器的机电效率的理论研究

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The electromechanical efficiency of a loaded tubular dielectric elastomer actuator (DEA) is investigated theoretically. In previous studies, the external system, on which the DEA performs mechanical work, is implemented implicitly by prescribing the stroke of the DEA in a closed operation cycle. Here, a more generic approach, modelling the external system by a frequency-dependent mechanical impedance which exerts a certain force on the DEA depending on its deformation, is chosen. It admits studying the dependence of the electromechanical efficiency of the DEA on the external system. A closed operation cycle is realized by exciting the DEA electrically by a sinusoidal voltage around a bias voltage. A detailed parametric study shows that the electromechanical efficiency is highly dependent on the frequency, amplitude, and bias of the excitation voltage and the mechanical impedance of the external system as well. Efficiencies of up to 93% can be observed for the Danfoss Poly-Power tubular DEA if the mechanical impedance of the external system is adjusted to the mechanical impedance of the DEA or vice versa. The study shows that a tubular DEA can be dimensioned and operated such that it performs most efficiently for a given application.
机译：理论上研究了加载式管状介电弹性体执行器（DEA）的机电效率。在先前的研究中，通过在封闭的操作循环中规定DEA的行程来隐式地实现DEA在其上执行机械工作的外部系统。在这里，选择了一种更为通用的方法，即通过频率相关的机械阻抗对外部系统进行建模，该机械阻抗根据DEA的变形在DEA上施加一定的力。它承认研究DEA的机电效率对外部系统的依赖性。通过用偏置电压附近的正弦电压电激励DEA，可以实现一个封闭的工作周期。详细的参数研究表明，机电效率高度依赖于激励电压的频率，幅度和偏置以及外部系统的机械阻抗。如果将外部系统的机械阻抗调整为DEA的机械阻抗，则对于Danfoss Poly-Power管状DEA可以观察到高达93％的效率，反之亦然。研究表明，管状DEA的尺寸和操作可以使它在给定的应用中最有效地发挥作用。

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