WP4: Adapting the loads process for non-linear and innovative structure

Top level technological objectives

  • To select and develop new ROM approaches specifically focussed on gust applications
  • To investigate the use of small amounts of high quality numerical or experimental data to improve accuracy and range of aerodynamic ROMs
  • To develop hybrid ROM/high fidelity methods
  • To investigate coupled reduced order aerodynamic and structural models for accuracy compared to higher fidelity approaches
  • To develop ROMs directly from high fidelity aeroelastic simulations
  • To investigate the use of uncertainty methods for ROM development.

Description of work

The current loads process uses classical approaches, such as the doublet lattice methods as surrogates for higher order CFD. However, there is an assumption of linearity that it explored in Work Package 3. It is likely that the loads process will need to be adapted for future aircraft that use highly flexible and innovative structure; however the inclusion of non-linearities using high order CFD will be too expensive. Therefore in this work package non-linear reduced order models will be derived from CFD simulations (such as those in WP2) and/or experimental data.

Although derived from high fidelity CFD, the ROM approximation can lead to error which can be reduced by updating or calibrating. The appropriate aerodynamic data that is most effective for obtaining reduced order models is not yet known and furthermore it is not known whether different data is needed for different ROMs. This issue will be explored in this work package.

Any reduced order model of the aerodynamics will need to be coupled to the elastic model of the aircraft to obtain the gust loads, hence in this work package coupling of the systems will be explored. It is also possible to create ROMs of a coupled aeroelastic system and this work package will also explore any advantages that this approach might bring.