A ROBUST QFT-EIGENSTRUCTURE ASSIGNMENT CONTROL METHOD FOR THE COUPLED DYNAMICS IN HIGH-SPEED CRAFTS

In this work, a combined QFT/EA approach is used to control a coupled system on a high speed-craft. Since the angle between the heading and the seaway is different from 180 degrees, the action of the actuators for controlling the longitudinal dynamic (heaving and pitching) produces a coupling in the lateral (rolling) dynamic, and vice- versa. The MIMO problem is firstly handled with EA technique in order to decouple the dynamics, which results in three SISO systems to solve with QFT design. It is shown that the combined EA/QFT technique is a robust method that accomplishes decoupling between the three dynamics and damped responses.