A nonlinear flight controller is developed using dynamic inversion principles. The nonlinearities in the equations of motion arising from inertia coupling and the gravity vector are compensated by dynamic inversion. Control and state decoupling is demonstrated for conventional aileron, elevator and rudder control surfaces using a static control allocation matrix and choice of stability axis rates for feedback respectively. We demonstrate that the right hand sides of the equations of motion can be approximated by using flight path variables and traditional feedback signals like normal and lateral accelerations. Further, except for the inertia compensation and gravity compensation terms which contain sine and cosine functions, the remainder of the controller can be designed in the linear domain. The simulation results are presented for a case where a nonlinear high performance fighter aircraft is undergoing a high angle of attack stability axis roll maneuver. This maneuver exercises the aircraft over a very wide dynamic range in a short time and demonstrates the capabilities of the nonlinear controller.

No abstract

No abstract

Air traffic density in India and the world at large is growing fast and posing challenging problems. The problems encountered can be parameterized as flight delay, workload of air traffic controllers and noise levels in and around aerodromes. Prediction and quantification of these parameters aid in developing strategies for efficient air traffic management. In this study, the method used for quantifying is by simulation and analysis of the selected aerodrome and air space. This paper presents the results of simulation of HAL Bangalore International Airport, which is used by civil as well as military aircraft. With the test flying of unscheduled military aircraft and the increase in the civil air traffic, this airport is hitting the limit of acceptable delay. The workload on air traffic controllers is pushed to high during peak times. The noise contour prediction, especially for the test flying military aircraft is sounding a wake up call to the communities living in the vicinity of the Airport.