DYNAMICS-BASED STRUCTURAL WEIGHT OPTIMIZATION OF A LARGE-SCALE 3D CONCRETE PRINTER FRAME WITH TIME-DEPENDENT PRINTHEAD DISPLACEMENT CONSTRAINTS

Tóm tắt

This study proposes a dynamics-based structural weight optimization approach for a large-scale gantry-type 3D concrete printer frame, in which time-dependent printhead displacement is explicitly considered as a performance constraint. Unlike conventional methods based on linear static analysis, the proposed framework integrates flexible multibody dynamicsimulation into the optimization loop, enabling direct evaluation of inertialeffects and structural vibrations on printhead accuracy. An automated computational framework is developed to couple finite element-based modal analysis, flexible multibody dynamics, and global optimization within a unified iterative process. Elastic characteristics extracted from a parametric finite element model are incorporated into a flexible dynamic model to evaluate printhead displacement under realistic operating conditions. A Genetic Algorithm (GA) is employed to iteratively update design variables,minimizing structural mass while satisfying displacement constraints. The results demonstrate a structural weight reduction of 63.09% while maintaining maximum printhead displacement below 1mm, highlighting the effectiveness of the proposed approach for dynamic-constrained design optimization.