Slipping Analysis on the Braking Process of a Commercial Aircraft with the Electric Brake Actuator

It has become a trend that the electrical brake actuator (EBA) is utilized for the commercial aircraft to make a full stop after it touches the ground, due to many advantages of the EBA, such as low maintenance cost, quick response, etc. The EBA is mainly consisted of brushless direct-current (DC) motor, gear pairs, ball-screw, pressure plate and brake disk stack, and the dynamics of each subsystem can be coupled with other subsystems which have mechanical connections. In this paper, the dynamical models of the subsystems of the EBA are built with ordinary differential equations, and the connection forces of the subsystems are derived. The longitudinal motions of the wheels, the landing gear, and the aircraft during the landing roll are also considered. The numerical simulations of the landing roll process of a commercial aircraft are carried out for different input voltages of the brushless DC motor, and the transmission efficiencies of the ball-screw. The slip rate, the landing roll distance and the landing roll time are examined for different simulation cases to study the braking performance and parameter sensitiveness of the EBA of such a commercial aircraft. This study can provide fundamentals to suggest the design and control the EBA for the commercial aircraft.