Research On Steering Nose Wheel Of Aircraft By Dynamic Simulation

Great attention has been paid to the research on the ground maneuvers of aircraft during the phase of aircraft design. The current main investigation about the ground maneuver of aircraft has been focused on the straight line motions, such as the landing buffering, vibration attenuating and shimmy, etc. However, there are few works dealing with the ground turn motion of aircraft. Compared with the conventional methods of steering the aircraft, such as adopting the differential braking and using the asymmetric engine thrust, steering nose wheel of aircraft has become the most important technology of performing aircraft ground maneuvers due to its prominent advantages, which has been widely applied in modern aircrafts.In the dissertation, a new dynamic analysis model of taxiing by adopting the co-simulation technique is proposed to study the maneuver characteristic by steering nose wheel of a large transportation aircrafts. Firstly, the methods about modeling the multi-body system dynamic analysis and the principles on the hydraulic drive system are studied. Then, based on the simulation software MSC.ADAMS/Aircraft, the mechanical models for the fuselage, the tire and the bumper of landing gear were selected and an effective dynamic model for aircraft ground motion was established by applying the dynamics basic theory. After studying the principle on the hydraulic system about steering nose wheel of aircraft and the basic hydraulic control loops, the software MSC.EASY5 was adopted to model the hydraulic system of steering nose wheel of aircraft. By adopting the XFE method, the MSC.ADAMS/Aircraft software and the MSC.EASY5 software were successfully applied to perform the co-simulation analysis of the ground maneuver by steering nose wheel of aircraft. Based on the co-simulation dynamic analysis model, the turning motion characteristic of aircraft was studied. The results demonstrate the feasibility of the dynamic analysis model. Finally, the effects of the two important parameters, such as the initial taxiing velocity of aircraft and the angle of steering nose wheel, on the forces acting on the tires were discussed in detail, and some valuable conclusions were drawn herein. The current work has laid a solid foundation for studying the ground maneuver characteristic by adopting the co-simulation technique for a large transportation aircraft.