This PhD project will focus on developing a quasi-3D beam models tailored to nonlinear aeroelastic systems that will be coupled to the aeroelastic suite of Nastran for extending its aeroelastic capabilities.
Nastran has been the industry standard for aeroelastic analyses at least for the last three decades. However, recent advancements in aircraft design techniques are fostering the development of more representative modelling techniques both for addressing the transonic aerodynamics (Computational Aeroelasticity) and for representing structural distributed and concentrated nonlinearities. This project focuses on the latter. The main aim is to develop a class of beam models that are able to describe the nonlinear-wing aeroelastic behaviour, by retaining the accuracy of a full 3D finite element models, while reducing significantly the computational cost. The new beam models will be, then, implemented and integrated in Nastran (via DMAP programming language) exploiting the unsteady aerodynamic built-in capabilities of the solver. The investigation will focus on both metallic and composite wing structures. The project will be step-by-step validated by an industry-standard finite element model and by a series of experimental tests conducted in the wind-tunnel facility of the University of Liverpool (UoL).
Hereinafter the breakdown of the tasks:
1. To develop quasi-3D beam models by using the method of power series expansion of the displacements components.
2. To derive the governing equations (GEs), in their week-form, by using classical and unconventional variational principles according to the problem addressed.
3. To validate numerically the new proposed formulation via finite element models which are representative of the same system.
4. To implement the quasi-3D beam models in Nastran developing environment by using the DMAP programming language, and interface the new models with the doublet lattice panel method built-in in Nastran.
5. To design, develop and manufacture a continuum aeroelastic model by using the quasi-3D beam models developed in task 1 for checking its ability to predict correctly the nonlinear aeroelastic behaviour.