Design of Autoland Controller Functions with Multiobjective Optimization

Gertjan Looye, Hans-Dieter Joos
2006 Journal of Guidance Control and Dynamics  
The application of multi-objective optimization to the design of longitudinal automatic landing control laws for a civil aircraft is discussed. The control laws consist of a stability and command augmentation, a speed / flight path tracking, a glide slope guidance, and a flare function. Multi-objective optimization is used to synthesize the free parameters in these controller functions. Performance criteria are thereby computed from linear as well as nonlinear analysis (eg. simulations,
more » ... ues). Robustness to uncertain and varying parameters is addressed via a multi-model approach, via robustness criteria (eg. gain and phase margins), and via statistical criteria (from on-line Monte Carlo analysis). For each controller function an optimization problem set-up is defined. Starting with the inner loops, the synthesis is sequentially expanded with each of these set-ups, eventually leading to simultaneous optimization of all controller functions. In this way, dynamic interactions between controller components are accounted for, and inner loops can be compromised such, that these can be used in combination with different outer loop functions. This reduces controller complexity while providing good over-all control system performance.
doi:10.2514/1.8797 fatcat:pdeb64d6ancsnijc6b4ijggheq