Higher-order 1D stick models for the flutter analysis of aircraft structures

This paper presents flutter analyses of aircraft structures using an advanced aeroelastic formulation. Threedimensional problems are reduced to refined 1D structural models based on the Carrera Unified Formulation (CUF). Lagrange expansions of the cross-section displacement field are used. CUF allows for a unified formulation, independent of the type and order of the chosen model, through the use of so-called fundamental nuclei. Aeroelastic results are obtained by coupling the CUF structural model with the doublet-lattice method (DLM). Aeroelastic analyses on thin-wall and multi-component structures are proposed. The advantage of the advanced 1D aeroelastic formulation is that it achieves accuracy comparable to that of 2D plate or 3D solid models while maintaining a low computational cost.