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Optimal design of a PZT bimorph actuator for minimally invasive surgery

机译：用于微创手术的PZT双压电晶片执行器的优化设计

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A methamodel-based presented is developed to optimize the force and displacement performance of a piezoceramic bimorph actuator. A segmented design with a variable piezoceramic layer thickness is proposed, where the thicknesses of discrete priezoceramic segments are used as the design variables. Design of experiments and metamodeling techniques are employed to construct computationally inexpensive approximations of finite element simulations of the PZT bimorph actuator. The to construct computationally inexpensive approximations of finite element simulations of the PZT bimorph actuator. The methamodels are then used in lieu of the actual FEM for optimization. Design objectives include maximum tip deflection, maximum graphsing force, and maximum work available at the tip. The metamodels are also used to rapidly generate the design space and identify the Pareto frontier for the competing design objectives of maximum deflection and maximum force. The accuracy and efficacy of two types of metamodels-response surfaces and kriging models-are compared in this study. By optimizing the thickness of the piezoceramic layers, and by allowing the voltage applied to each segment to vary, dramatic improvements in deflection and force are obtained when compared to a standard straight bimorph actuator. The motivation for this design is the need in the field of minimally invasive surgery for improved grasping tools, where a pair of optimized bimorph actuators can be used as a simple grasping device.
机译：提出了一种基于元模型的方法，以优化压电陶瓷双压电晶片执行器的力和位移性能。提出了一种具有可变压电陶瓷层厚度的分段设计，其中将离散的压电陶瓷段的厚度用作设计变量。实验设计和元建模技术被用来构造PZT双压电晶片执行器的有限元模拟的计算上便宜的近似值。构造PZT双压电晶片执行器的有限元模拟的计算上不昂贵的近似值。然后使用元模型代替实际的FEM进行优化。设计目标包括最大的笔尖挠度，最大的制图力以及笔尖处的最大功。元模型还用于快速生成设计空间，并为最大挠度和最大力的竞争设计目标确定帕累托边界。在这项研究中比较了两种类型的元模型（响应面和克里金模型）的准确性和有效性。与标准的直双压电晶片执行器相比，通过优化压电陶瓷层的厚度并允许施加到每个段的电压发生变化，可以显着改善偏转和力。这种设计的动机是在微创外科领域中需要改进的抓握工具，其中一对优化的双压电晶片致动器可以用作简单的抓握装置。

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