Semi-physical Simulation Of Multi-wheel Aircraft Braking System Based On Virtual Prototyping

As one of the most important equipments in the aircraft, anti-skid braking control system is mostly aimed to shorten brake running distance and steer the taxiing aircraft. With rapid development of modern aircraft and increasing weight and touch-down speed, the kinetic energy and brake running distance are higher and higher. Concerning this situation, designing high-performance anti-skid braking control system is like an arrow on the bowstring, but it is dangerous and costly to modify the parameters of the anti-skid braking control system directly in the aircraft.In this dissertation, the four-wheel virtual prototype with airframe, landing gears, wheels, and braking device, is established in MSC.ADAMS 2005 according to main parameters of Boeing 737-800. The velocity-rate-controlled and pressure-bias-modulated (PBM) control algorithm with balance compensation is used in this system. Then, the port program is designed by FORTRAN language which is aimed to exchange data between digital aircraft and USB input/output Board. Finally, anti-skid braking simulation platform is established which includes USB input/output Board, digital aircraft, and anti-skid control box which has intellectual property. Semi-physical simulation is performed on this simulation platform.The results of semi-physical simulation show that the digital aircraft can show many analyses quickly by graphic and their fidelity is high. The anti-skid braking simulation platform provides good situation for the designed anti-skid control box. It is great significant to design and research anti-skid braking system.