An Approximate Method for Buckling Analysis and Optimization of Composite Lattice Conical Panels Considering Geometric Parameters

• Published in: International journal of aeronautical and space sciences 2023, 24(5), , pp.1244-1256
• Main Authors: Kim, Pyunghwa, Park, Jungsun
• Format: Article
• Language: English
• Subjects: Aerospace Technology and Astronautics; Engineering; Fluid- and Aerodynamics; Original Paper; 항공우주공학
• ISSN: 2093-274X; 2093-2480
• DOI: 10.1007/s42405-023-00589-1

This paper proposes an approximate method for calculating the critical buckling load of conical composite lattice panels. The conical composite lattice panel consists of helical and hoop ribs and can be described by geometrical parameters. Using these geometric parameters, the critical buckling load of conical composite lattice panels under uniform compression is predicted. The present method is validated by comparing the critical buckling loads obtained under a simply supported boundary condition with those obtained by the finite element method. The results of the critical buckling load show good agreement between the present method and finite element analysis. A parametric study is performed using the present method to investigate the influence of the number of hoop and helical ribs on the critical buckling load. In the parametric study, the number of helical and hoop ribs is defined as design variables, and the critical buckling load is defined as the response. In addition, the present method is applied to the optimization of composite lattice conical panels using a genetic algorithm. The optimization of the panels is defined by minimizing the mass, while defining the critical load as the boundary condition. Therefore, the approximation method using geometric functions provides not only analysis of critical buckling loads for composite lattice panels but also a useful tool for optimal design.