Multivariable Controller Design for a Trimmable Horizontal Stabilizer Actuator with Two Primary Load Paths


Betätigungssysteme und Aktuatoren



Art der Publikation:



THSA, H_inf Controller Design, Mixed Sensitivity Design


Nils Wachendorf, F. Thielecke, Udo B. Carl, Timo Pe


26th International Congress of the Aeronautical Sciences (ICAS)

A novel drive concept for the Trimmable Horizontal Stabilizer Actuator (THSA) is based on two ballscrews operating in parallel which move the stabilizer to adjust the angle of attack of the horizontal tailplane. The positions of the ballscrew nuts are mechanically synchronized because the two installed differential gearboxes uniformly distribute the mechanical power to the two drive chains independently of the operational condition. A H_inf controller design is employed to control the rotational speed of the hydraulic motors. The resulting multivariable speed controller is implemented into the nonlinear simulation model, the simulation results of which are validated through measurements at the THSA test rig. The simulation results of the multivariable closed loop are compared with the results obtained from a closed loop with cascade structure.