Assessment of an H∞-Based Robust Controller Through Piloted Simulator Testing of Helicopter Handling Qualities
T.S. Wennink (TU Delft - Aerospace Engineering)
MD Pavel – Mentor (TU Delft - Control & Simulation)
Spilios Theodoulis – Mentor (TU Delft - Control & Simulation)
M. M.(René) van Paassen – Graduation committee member (TU Delft - Control & Simulation)
Xuerui Wang – Graduation committee member (TU Delft - Aerospace Structures & Computational Mechanics)
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Abstract
This thesis is on the assessment of handling qualities for a robust controller, previously designed using H∞ techniques for a longitudinal model of the Bo-105. A piloted simulator flight test was conducted in which a set of tasks was flown. These tasks included configuration of stick sensitivity, pitch and altitude tracking tasks, flown at different flight conditions to show robustness, as well as a bob-up and acceleration-deceleration task. The resulting handling quality rating showed that the controller, designed for a theoretical rating of level 1, achieved between level 1 and level 2 handling qualities between the tasks. Non-controller factors, such as stick force, missing cueing and performance limits, were commented on by the pilots to have an effect on the rating. Anti-windup methods, clamping and back-calculation, were used to improve controller response, and reduce oscillations observed during testing.