柔顺机构拓扑图提取  

Topology Extraction of the Compliant Mechanism

作　　者：牛小铁[1] 李兆坤[1] 张宪民[2] 史利娟[1] 

机构地区：[1]北京工业职业技术学院机电工程系,北京100042 [2]华南理工大学机械与汽车工程学院,广州510640

出　　处：《机械设计与研究》2013年第1期18-21,共4页Machine Design And Research

基　　金：北京市教委资助项目(PHR201106230)

摘　　要：柔顺机构拓扑优化所得机构是非光滑锯齿状跳跃边界的几何图像,不能直接应用于工程实际,因而研究柔顺机构拓扑图提取就显得十分必要。基于此,给出了一种柔顺机构拓扑图提取的新方法。首先,对柔顺机构拓扑所得灰度图像进行二值化处理,找到满足目标函数的罚值,得到只有0和1密度分布的锯齿跳跃边界图像。然后,采用密度等值线方法,求节点密度,对锯齿跳跃边界进行光滑近似。第三,针对柔顺机构性能特点,选择适合形状优化的变量参数,用样条曲线对光滑边界进行曲线重构,得到CAD系统可以识别的参数化模型。最后,通过算例说明以上方法的正确性和有效性。Homogenization or material distribution method based topology optimization will create final topologies in grey level image and sawtooth jump discontinuity boundaries that are not suitable for direct engineering practice, so it is necessary to extract the topological diagram. And a new topology extraction method for compliant mechanisms is presented. In the fist stage, the grey level image is transferred into the binary image. The threshold value meeting to objective function is obtained so that each element is either empty or solid. In the sencond stage, the density contour approach is used by redistributing nodal densities to generate the smooth boundaries. In the third stage, parameterized Bspline curves is reeonsitituted considering characteristic of compliant mechanisms and the parameter slection ready to undergo shape optimization. In the final stage, simulations of examples are presented to show the validity of the proposed method.

关 键 词：柔顺机构 拓扑图提取 密度等值线方法 曲线重构 

分 类 号：TH112.1[机械工程—机械设计及理论] TH113