Scissor Structures with Desired Path Expansion: Parametric Modeling and Optimization

Abstract

Transformed between predefined configurations designers can rapidly apply deployable scissor structures. By connecting successive points during movement-known as path generation- each point in a scissor structure follows a specific path. The path of a moving point is the geometric location of its successive positions defined by the structure's geometry and support conditions. The path generation problem can be solved graphically or analytically where the graphical method offers a straightforward and convenient solution for simplified mechanisms. This article establishes a method for generating motion paths in scissor structures by integrating graphical analysis with an optimization technique. After defining path generation the path corresponding to the desired motion is determined and the structure is optimized to follow this target path. This path can then serve as a movement guide within the scissor structure. During optimization straight bars in the translational units are modified into angulated bars to meet deployability requirements.