Vibration analysis and optimization of sandwich composite with curvilinear fibers

13th International Conference on Motion and Vibration Control; 12th International Conference on Recent Advances in Structural Dynamics

Honda, S.^1 ; Narita, Y.^1

Division of Human Mechanical Systems and Design, Faculty of Engineering, Hokkaido University, Kita 13, Nishi 8, Sapporo, Hokkaido

060-8628, Japan^1

关键词: Composite sandwich plates;    Composite sandwiches;    Continuous design variables;    Fundamental frequencies;    Optimization problems;    Refined zigzag theories;    Three-dimensional theory;    Vibration characteristics;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/744/1/012020/pdf
DOI  :  10.1088/1742-6596/744/1/012020

来源: IOP

【 摘 要 】

The present paper develops a shell element based on the refined zigzag theory (RZT) and applies it to the vibration analysis and optimization problem of the composite sandwich plate composed of CFRP skins and soft-cores. The RZT accepts large differences in layer stiffness, and requires less calculation effort than the layer-wise or three-dimensional theories. Numerical results revealed that the present method predicts vibration characteristics of composite sandwich plates with soft-core accurately. Then, shapes of reinforcing fibers in CFRP composite skins are optimized to maximize fundamental frequencies. As an optimizer, the particle swarm optimization (PSO) approach is employed since curvilinear fiber shapes are defined by continuous design variables. Obtained results showed that the composite sandwich with optimum curvilinear fiber shapes indicates higher fundamental frequencies compared with straight fibers.