{'fraction_non_alphanumeric': 0.02169421487603306, 'fraction_numerical': 0.0010330578512396695, 'mean_word_length': 5.171974522292993, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Robust 2-DOF H-infinity Controller for Highly Flexible Aircraft : Design Methodology and Numerical Results

However, the potential proximity of the aircraft's first flexible modes with the controller bandwidth may generate a spillover phenomenon causing aircraft instability if the flexible modes are not taken into account in the controller design. In this paper, a H∞ robust synthesis method is used to design a two degrees-of-freedom controller for a most realistic model of the lateral dynamics of a highly flexible civil transport aircraft. The aircraft model is presented and analysed. Then, its order is reduced and modelling uncertainties are explicitly defined. Next, the control-law synthesis algorithm is explained and applied to the flexible aircraft model. Finally, numerical results are presented and discussed. They show the efficiency of the method since the closed-loop system meets a set of realistic specifications in the frequency and time domains.