Showing 3 results for V-Gap Metric
Mr. Mohammad Javad Moafi Madani, Dr. Iman Mohammadzaman,
Volume 6, Issue 1 (6-2012)
Abstract
This paper presents a new stability preserving interpolation technique for robust gain scheduling autopilot design. The interpolation method is based on interpolation in the common stability region of local controllers and generates a gain-scheduled controller that is stabilizing at every operating point of a closed loop system. For selection of stability region of local controllers, the notion of the v-gap metric and its connection to robust loop-shaping theory is used. The proposed method facilitates the design of gain-scheduled controllers that preserves stability of the closed loop system. The simulation results given show the generality and effectivneness of the proposed control strategy in terms of the stability, performance and robustness, of the system.
Mr Mahdi Khosravi Samamani, Mr Mohammad Javad Moafi Madani, Mr Mahdi Nikusokhan, Dr Iman Mohammadzaman,
Volume 10, Issue 3 (12-2016)
Abstract
Radome causes refraction of the incoming rardar wave in radar-guided interceptors, thus having a destabilizing effect on the guidance loop, especially at high altitudes. Therefore, a compensator is required to maintain the stability of the guidance loop and causes minimum miss distance in the presence of radome error. From the control perspective, Radome causes an unwanted feedback that is not similar to the conventional feedback loops, in which output must follow a desired control signal. In this paper, the desired closed-loop response is determined first, then a novel approach is proposed to shape the frequency response of the feedforward path so that the stability and performance requirements are satisfied . Frequency response is shaped by linear matrix inequality (LMI) tools and v-gap metric is used to select the best frequency response. Simulation results show that the designed compensator drastically decreases the miss distance, while the stability is guaranteed.
Iman Mohammadzaman, Mohammad Javad Moafi Madani,
Volume 11, Issue 4 (3-2018)
Abstract
In this paper a robust autopilot is designed using fuzzy gain scheduling. At first the flight envelop is divided to sub regions using v-gap metric and a suitable operating point is selected in each region and robust static H∞ loop shaping controller is designed for the linearized model. Finally, fuzzy gain scheduling is used to interpolate the local controllers. Simulation results show the generality and effectiveness of the proposed control strategy in terms of the performance and robustness of the system.
