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Energy harvesting through a backpack employing a mechanically amplified piezoelectric stack

机译：通过采用机械放大压电叠层的背包收集能量

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Over the past few decades, the use of portable and wearable electronics has grown steadily. These devices are becoming increasingly more powerful, however, the gains that have been made in the device performance has resulted in the need for significantly higher power to operate the electronics. This issue has been further complicated due to the stagnate growth of battery technology over the past decade. In order to increase the life of these electronics, researchers have begun investigating methods of generating energy from ambient sources such that the life of the electronics can be prolonged. Recent developments in the field have led to the design of a number of mechanisms that can be used to generate electrical energy, from a variety of sources including thermal, solar, strain, inertia, etc. Many of these energy sources are available for use with humans, but their use must be carefully considered such that parasitic effects that could disrupt the user's gait or endurance are avoided. This study develops a novel energy harvesting backpack that can generate electrical energy from the differential forces between the wearer and the pack. The goal of this system is to make the energy harvesting device transparent to the wearer such that his or her endurance and dexterity is not compromised. This will be accomplished by replacing the strap buckle with a mechanically amplified piezoelectric stack actuator. Piezoelectric stack actuators have found little use in energy harvesting applications due to their high stiffness which makes straining the material difficult. This issue will be alleviated using a mechanically amplified stack which allows the relatively low forces generated by the pack to be transformed to high forces on the piezoelectric stack. This paper will develop a theoretical model of the piezoelectric buckle and perform experimental testing to validate the model accuracy and energy harvesting performance.
机译：在过去的几十年中，便携式和可穿戴电子设备的使用稳步增长。这些设备变得越来越强大，但是，在设备性能方面取得的进步导致需要更高功率来操作电子设备。由于电池技术在过去十年中停滞发展，这个问题变得更加复杂。为了增加这些电子设备的寿命，研究人员已经开始研究从周围环境产生能量的方法，从而可以延长电子设备的寿命。该领域的最新发展导致设计了许多可用于从各种来源产生电能的机构，包括热，太阳能，应变，惯性等。这些能源中有许多可用于人体，但必须仔细考虑其使用方式，以避免可能破坏使用者步态或耐力的寄生效应。这项研究开发了一种新型的能量收集背包，该背包可以通过穿着者和背包之间的不同力产生电能。该系统的目的是使能量收集装置对穿戴者透明，从而不损害其耐力和灵活性。这可以通过用机械放大的压电堆栈执行器代替皮带扣来实现。压电叠层致动器因其高刚度而很难在能量收集应用中使用，这使材料难以张紧。使用机械放大的叠层可以减轻这个问题，该叠层允许由电池组产生的相对较低的力转化为压电叠层上的较高的力。本文将建立压电扣的理论模型并进行实验测试，以验证模型的准确性和能量收集性能。

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