Optimization of the prismatic core sandwich panel by using the Improved Constrained Differential Evolution algorithm

In this study, weight optimization of the prismatic core sandwich panel under the transverse and longitudinal loadings has been independently investigated. To solve the optimization problems corresponding to the mentioned loadings, the Improved Constrained Differential Evolution (ICDE) algorithm based on the multi-objective constraint handling method has been used. The constrains of the problems are buckling load and yield stress. By comparing the results of the ICDE with those obtained by the other evolutionary algorithms based on the penalty function method in the previous studies, it can be seen that the results of the transverse loading obtained in this study are equal to those of the previous works, but the results of the ICDE in the longitudinal loading are better. In addition to its better results and ease of Implementation, another advantage of ICDE is that there is no need to the process of trial and error to fine tuning of the penalty function parameters. It can be observed that for the both types of loading, values of the panel height, the thicknesses of the face and core in addition to the weight index are increased by increasing the load index to avoid yielding and buckling of the panel. But in a constant value of the load index, by increasing the core corrugate number, the weight index has a lowering behavior in the transverse loading and a rising behavior in the longitudinal loading. However, the thicknesses of the face and core have a lowering behavior and the panel height has a rising behavior.