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Induced Damping And Its Relationship To Beneficial Energy Harvesting In Dielectric Elastomers With Application To Walking

机译:诱导阻尼及其与电介质弹性体有益能量收集的关系及其在行走中的应用

摘要

This dissertation presents a novel, interdisciplinary research which addresses the potential of applying soft polymeric materials to strategically harvest biomechanical energy in a beneficial manner for use as a viable, low power source for on-board electronics. Of particular interest are electroactive polymers (EAP), which unlike other types of electromechanical smart materials such as piezoelectric ceramics, which are often brittle, have low elastic modulus and can exhibit large strains without substantial stress generations. One type of EAP, the dielectric elastomer (DE), which utilizes electrostatic forces built up across the dielectric polymer to convert between electrical and mechanical energy, is employed in this research. As with most EAPs, DE materials are highly nonlinear and require novel models to understand the electromechanical coupling and the effects of energy harvesting on the host structure which it is attached to.Since energy harvesting fundamentally involves harnessing the dissipative energy in a system, this research specifically investigates the relationship between biomechanical damping and energy harvesting induced by DE thin films affixed to the knee and operated during walking. This research has three objectives: (1) energy harvesting characterization of composite electrode/DE polymers under uniaxial stretching and electrical loading by improved hyperelastic modeling and experiments; (2) development of relationships between energy harvesting and damping for the DE materials in uniaxial stretching and on a biofidelic knee model; and (3) investigation of the kinetic effects of beneficial DE energy harvesting during walking. Our empirical modeling leads to a more comprehensive constitutive relation for DE materials and allows a means to directly assess the effects of energy harvesting on the wearer. By selectively inducing damping through coordinated mechanical and electrical loading of the DE device, it is demonstrated through simulations that beneficial energy harvesting strategies that account for the various mechanisms of metabolisms and energy expenditure involved in walking can be archived.This research is significant as it lays the foundation for future work in the integration of wearable technology using dielectric elastomers with sensing, actuation, and energy harvesting, and establishes a pathway for the integration of DE energy harvesting into a broad spectrum of applications where comfortable, inconspicuous, wearable devices can be designed to harvest energy in an unobtrusive manner.
机译:本论文提出了一个新颖的跨学科研究,该研究探讨了应用柔软的聚合材料以有益的方式策略性地收获生物力学能量的潜力,以用作车载电子设备的可行,低功率来源。特别令人关注的是电活性聚合物(EAP),它与其他类型的机电智能材料(例如压电陶瓷)不同,后者通常是脆性的,具有低弹性模量并且可以表现出较大的应变而不会产生大量应力。这项研究采用了一种类型的EAP,即介电弹性体(DE),它利用在介电聚合物上建立的静电力在电能和机械能之间进行转换。与大多数EAP一样,DE材料是高度非线性的,需要新颖的模型来理解机电耦合以及能量收集对其所附着的主体结构的影响。由于能量收集从根本上涉及利用系统中的耗散能量,因此本研究具体研究了固定在膝盖上并在行走过程中操作的DE薄膜引起的生物力学阻尼与能量收集之间的关系。这项研究具有三个目标:(1)通过改进的超弹性建模和实验,在单轴拉伸和电负载下表征复合电极/ DE聚合物的能量收集特性; (2)在单轴拉伸和生物仿生膝关节模型中开发了DE材料的能量收集和阻尼之间的关系; (3)研究步行过程中有益的DE能量收集的动力学效应。我们的经验模型导致DE材料的本构关系更加全面,并允许直接评估能量收集对穿戴者的影响。通过选择性地通过DE设备的机械和电气负载的协调作用来诱导阻尼,通过仿真证明可以解释有益的能量收集策略,该策略考虑了行走过程中涉及的新陈代谢和能量消耗的各种机制。使用介电弹性体与传感,驱动和能量收集集成可穿戴技术的未来工作的基础,并为将DE能量收集集成到可以设计舒适,不起眼的可穿戴设备的广泛应用中建立了一条途径以不显眼的方式收集能量。

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    Lai Heather L.;

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  • 年度 2013
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