Multi-Objective Design Optimization of Grillage Systems by Scatter Search Methodology

In this study the design of grillage systems is minimized considering both its entire weight and joint displacements. Scatter search methodology as an optimization tool is utilized for design minimization. Scatter search methodology executes its optimization procedures using predefined values of genetic operators. However, this approach causes to an increase in computational cost of optimization procedures. This bottleneck is overcome by dynamically adjusting the parameter values of genetic operators according to values of two performance metrics_ Spread and Inverted Generational Distance (IGD). Furthermore, the flexibility of proposed optimization tool based on scatter search methodology is increased by automatically generating longitudinal-transversal beams of grillage system and correspondingly distributing the loads to the related joints. It is demonstrated that proposed optimization tool has a capability of producing better optimal designations compared to those obtained by a pure usage of scatter search methodology.