Dead center position of planar mechanism based on constraint normal line
NIU Jian
WANG Youli
WANG Xiaohui
JIANG Lianyun
Abstract：[Objective]To address the issues of low efficiency and difficult operation in determining dead center position for complex planar mechanisms,a method for identifying dead center position based on constraint normal line was proposed.[Methods]Firstly,the definition and representation method of constraint normal line for the target component in planer mechanism were established.Secondly,the dead center identification criterion was proposed,and its proof was provided.Subsequently,a Stephenson-Ⅲ six-bar linkage was selected for analysis.Its analysis was compared with that of the same type of linkage in relevant literature,leading to discrepant results.An in-depth analysis was then conducted on these discrepancies.[Results]This case validation demonstrates that the new method is straightforward,intuitive,easy to grasp,and exhibits quite broad applicability.
Keywords：Constraint normal lineComplex planar mechanismNew definition of the dead centerDegree of freedom of componentDead center position
Publication Date：2025-10-31
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：6( 40-45 )