Design and manufacturing rules for maximizing the performance of polycrystalline piezoelectric bending actuators
Design and manufacturing rules for maximizing the performance of polycrystalline piezoelectric bending actuators
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DOI：
10.1088/0964-1726/24/6/065023
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发表时间：
2015-06-01
影响因子：
4.1
通讯作者：
Wood, Robert J.
中科院分区：
文献类型：
--
作者：
Jafferis, Noah T.;Smith, Michael J.;Wood, Robert J.
提高压电致动器的能量和功率密度对于任何重量敏感的应用都非常重要，对于利用该技术实现微/毫米级机器人和设备的自主性尤为重要。这是通过使用激光诱导熔化或抛光、绝缘边缘涂层和止裂特征最大化机械弯曲强度和电介电强度来实现的，结合刚性地面附件的特征以最大化力输出。制造技术也已经被开发以实现大规模定制，其中材料片被预先堆叠以形成层压件，从该层压件可以仅使用激光切割来制造几乎任意的平面致动器设计。与现有的制造方法相比，这些技术使能量密度增加了70%，平均寿命增加了至少15倍。此外，测量结果表明，在实现最大能量密度所需的高场操作时，压电系数加倍，沿着在高压缩应变下杨氏模量增加，这两种效应有助于解释我们的致动器的性能比线性模型预测的更高。
Increasing the energy and power density of piezoelectric actuators is very important for any weight-sensitive application, and is especially crucial for enabling autonomy in micro/milli-scale robots and devices utilizing this technology. This is achieved by maximizing the mechanical flexural strength and electrical dielectric strength through the use of laser-induced melting or polishing, insulating edge coating, and crack-arresting features, combined with features for rigid ground attachments to maximize force output. Manufacturing techniques have also been developed to enable mass customization, in which sheets of material are pre-stacked to form a laminate from which nearly arbitrary planar actuator designs can be fabricated using only laser cutting. These techniques have led to a 70% increase in energy density and an increase in mean lifetime of at least 15x compared to prior manufacturing methods. In addition, measurements have revealed a doubling of the piezoelectric coefficient when operating at the high fields necessary to achieve maximal energy densities, along with an increase in the Young's modulus at the high compressive strains encountered-these two effects help to explain the higher performance of our actuators as compared to that predicted by linear models.