Abstract: The stiffness of a multi-link hinge is a critical factor influencing its performance. Simplify the entity multi-link hinge into rods, and then optimize its motion trajectory using a multi parameter objective function based on the motion relationship between the rods. Design the entity multi-link hinge according to the optimized optimal trajectory. Then, using structural dimension optimization software, the dimensions of the entity components of the multi-link were optimized, thereby enhancing the overall stiffness of the multi-link hinge. Through analysis of the motion trajectory and structural dimensions of multi-link hinges, the influence of various factors on their stiffness and the optimal structural form were obtained, providing theoretical guidance for the practical application of multi-link hinges to a certain extent.

Key words: Multi-link, Stiffness, Optimization of motion trajectory, Size optimization