封闭形 meaning in English

enclosed shape

This method is also valid for identifying the circuit and branch defect of first group spatial linkages based on the equivalent of circuit properties of the first group spatial linkages and its equivalent sphere four - bar linkage base on the property of the solutions of quartic equation , the conclusion that the number and order of branch between two adjacent stationary positions of the input link are derived . then , the new method to identify circuits of spatial single - loop linkages with four closures is presented . all types of the manner on which the branches coalesce at the stationary positions of the input link are obtained and the procedures to determine the type automatically are developed
基于一元四次方程解的性质，得到了在输入构件两个相邻瞬时静止位置之间机构的分支的数目和大小顺序不变的结论，进而提出了识别具有四个封闭形的空间单环机构回路的新方法一一死点法，综合出了输入构件位于瞬时静止位置时机构分支结合情况的所有类型及其自动判别方法，研究了由所有结合的分支信息自动生成回路的算法，首次解决了此类机构回路与回路缺陷的自动识别。