A New Approach to analysis of t-domain and f-domain in A Nose- Wheel Steering of Medium-Haul Air-Craft

Electromechanical nose-wheel steering systems give the Medium-haul air-crafts the needed maneuverability and durability. These air-crafts are of intermediate size. They must be able to utilize small airfields, having little or no service and maintenance facilities. During take-off, the nose-wheel steering keeps proper heading. Feedback from the nose-wheel heading is compared with the pilot command to generate the error signal. This signal is amplified and applied to a magnetic particle clutch, which activates the rotation of the wheel-heading. The paper deals with nose-wheel steering of Medium haul aircraft. The design specifications are conflicting with each other. To keep the steady state error at a low value the forward path gain must be high. At the required value of the gain, the system becomes unstable. Addition of rate feedback makes the system stable but it fails to satisfy the transient requirement. The overshoot remains at a high value even if the coefficient of rate feedback is varied over a wide range. The required t-domain performance could be achieved by the addition of weighted acceleration feedback. The specifications could be fulfilled by suitably choosing the coefficients of rate and acceleration feedback. Starting from the block diagram, the mathematical model has been developed and the analytical treatment has been made by indigenously made computer program. The results have been verified by using MATLAB-tools.