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Increased power to weight ratio of piezoelectric energy harvesters through integration of cellular honeycomb structures

机译：通过集成蜂窝状蜂窝结构提高了压电能量收集器的功率重量比

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摘要

The limitations posed by batteries have compelled the need to investigate energy harvesting methods to power small electronic devices that require very low operational power. Vibration based energy harvesting methods with piezoelectric transduction in particular has been shown to possess potential towards energy harvesters replacing batteries. Current piezoelectric energy harvesters exhibit considerably lower power to weight ratio or specific power when compared to batteries the harvesters seek to replace. To attain the goal of battery-less self-sustainable device operation the power to weight ratio gap between piezoelectric energy harvesters and batteries need to be bridged. In this paper the potential of integrating lightweight honeycomb structures with existing piezoelectric device configurations (bimorph) towards achieving higher specific power is investigated. It is shown in this study that at low excitation frequency ranges, replacing the solid continuous substrate of conventional bimorph with honeycomb structures of the same material results in a significant increase in power to weight ratio of the piezoelectric harvester. At higher driving frequency ranges it is shown that unlike the traditional piezoelectric bimorph with solid continuous substrate, the honeycomb substrate bimorph can preserve optimum global design parameters through manipulation of honeycomb unit cell parameters. Increased operating lifetime and design flexibility of the honeycomb core piezoelectric bimorph is demonstrated as unit cell parameters of the honeycomb structures can be manipulated to alter mass and stiffness properties of the substrate, resulting in unit cell parameter significantly influencing power generation.
机译：电池所带来的局限性迫使需要研究能量收集方法，以为需要非常低工作功率的小型电子设备供电。特别是基于压电换能的基于振动的能量收集方法已被证明具有替代电池的能量收集器的潜力。与收集器寻求更换的电池相比，当前的压电式能量收集器表现出相当低的功率重量比或比功率。为了实现无电池自持式设备运行的目标，需要缩小压电能量收集器与电池之间的功率重量比差距。在本文中，研究了将轻质蜂窝结构与现有的压电器件配置（双压电晶片）集成以实现更高的比功率的潜力。在这项研究中表明，在低激励频率范围内，用相同材料的蜂窝结构代替常规双压电晶片的固态连续基板会导致压电收割机的功率重量比显着增加。在较高的驱动频率范围内，显示出与具有固体连续基底的传统压电双压电晶片不同，蜂窝基底双压电晶片可以通过操纵蜂窝晶胞参数来保留最佳的整体设计参数。由于可以控制蜂窝结构的晶胞参数以改变基板的质量和刚度特性，因此证明了蜂窝芯压电双压电晶片的使用寿命更长，设计灵活性更高，从而导致晶胞参数显着影响发电。

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