Research paper. Advance in Electronic and Electric Engineering. ISSN 2231-1297, Volume 3, Number 8 (2013), pp. 959-964.In this paper, a flight path rate demand two loop autopilot in pitch plane called lateral autopilot is considered where the steady state gain of the autopilot system is non-unity .The present work is an attempt to achieve a unity steady state gain of the autopilot system which generates a flight path rate output for a flight path rate command. For this, a PI controller is introduced in the reduced order model of autopilot system obtained through Routh Approximation method in order to eliminate the static error and to obtain a unity steady state gain of the two loop autopilot system . A model based PI design method based on plants parameter is used for the calculation of PI gain values. A numerical example has been considered and the simulation results are obtained through MATLAB software.Contents:
Introduction.
Mathematical model of two loop autopilot in pitch plane.
Reduced order model of two loop autopilot.
PI design methodology for two loop autopilot.
Calculation of pi controller gain values.
Simulation results.
Conclusion.
