基于拓扑优化的人工晶状体襻柔性机构设计

为了解决目前人工晶状体不能实现大跨度调节问题,根据人体生物眼测量基础数据及调节机制,建立了人工晶状体襻结构生物力学模型.基于结构拓扑优化方法,对人工晶状体襻结构进行了拓扑优化分析,得到布局合理的基本骨架结构.经机构运动学分析,给出了机构目标点位移值的变化规律.采用柔性建模理论方法,考虑材料特性及关节柔性,深入研究了该放大机构的实际运动规律,给出了该柔性机构位移放大的一般规律.经本模型优化后得到柔性机构位移输出值可达输入值的3.34倍,光学部前置位移随之增加,理论上可实现视觉质量的提高.

Compliant Mechanism Design for IOL Haptics Using Topology Optimization

Based on the biological data and adjustment mechanism of human eyes, a biomechanical model was established. In which the haptics of intraocular lens were analyzed by structural topology optimization method, and then a basic framework structure was obtained. The results of kinematics analysis of the mechanism show that the maximum displacement of target element reaches the expected goal. A fully compliant mechanism was conducted in this paper by using finife element method, followed by displacement analysis and stress analysis. The analysis confirms that the mechanism design is capable of amplifying motion, and indicates that structure of haptics can be improved or designed by using topology optimization method, finite element method and design theory of intraocular lens. The output displacement of compliant mechanism is 3. 34 times higher than that of input after topology of this model. Meanwhile the forward displacement of optical part is increased and the visual quality can be improved theoretically as well.