H∞ control of crippled aircraft in lateral motion with throttles only

In a hydraulic failure emergency situation, throttles can be used to augment or replace the aircraft hydraulically-actuated flight control system. Collective throttle inputs can be used to control pitch. Differential throttle inputs generate yaw, which through dihedral effect result in roll. In this paper we design a controller for crippled airplanes in lateral motion. Through the H_∞ compensator, the response of the crippled airplane, using throttles as the only control inputs, matches optimally in the H_∞ sense the response of the normal airplane to control surface command signals