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Salman Ijaz,Mirza Tariq Hamayun,Lin Yan,Muhammad Faisal Mumtaz 대한전기학회 2016 Journal of Electrical Engineering & Technology Vol.11 No.6
This paper presents an application of fractional order controller for the control of multi input multi output twin rotor aerodynamic system. Dynamics of the considered system are highly nonlinear and there exists a significant cross-coupling between the horizontal and vertical axes (pitch & yaw). In this paper, a fractional order model of twin rotor aerodynamic system is identified using input output data from nonlinear system. Based upon identified fractional order model, a fractional order PID controller is designed to control the angular position of level bar of twin rotor aerodynamic system. The parameters of controller are tuned using Nelder-Mead optimization and compared with particle swarm optimization techniques. Simulation results on the nonlinear model show a significant improvement in the performance of fractional order PID controller as compared to a classical PID controller.
Ijaz, Salman,Hamayun, Mirza Tariq,Yan, Lin,Mumtaz, Muhammad Faisal The Korean Institute of Electrical Engineers 2016 Journal of Electrical Engineering & Technology Vol.11 No.6
This paper presents an application of fractional order controller for the control of multi input multi output twin rotor aerodynamic system. Dynamics of the considered system are highly nonlinear and there exists a significant cross-coupling between the horizontal and vertical axes (pitch & yaw). In this paper, a fractional order model of twin rotor aerodynamic system is identified using input output data from nonlinear system. Based upon identified fractional order model, a fractional order PID controller is designed to control the angular position of level bar of twin rotor aerodynamic system. The parameters of controller are tuned using Nelder-Mead optimization and compared with particle swarm optimization techniques. Simulation results on the nonlinear model show a significant improvement in the performance of fractional order PID controller as compared to a classical PID controller.
LPV Modeling and Tracking Control of Dissimilar Redundant Actuation System for Civil Aircraft
Salman Ijaz,Mirza Tariq Hamayun,Haris Anwaar,Lin Yan,Ming Kuo Li 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.3
Dissimilar redundant actuation systems (DRAS) are in practice in advanced aircraft in order to increasereliability and to resolve the actuator failure issue due to common cause. This paper addresses the problem offorce fighting that occurs due to dynamics mismatch of two dissimilar actuators in DRAS and provides a method toachieve precise tracking of aircraft control surface. The nonlinear system dynamics are first transformed into linearparameter varying (LPV) form using recursive least square (RLS) method. The LPV observer based controller isthen designed to synchronize the positions of dissimilar actuators in DRAS and to drive the control surface smoothly. By applying linear matrix inequalities (LMIs), parameter dependent Lyapunov function (PDLF) is obtained toachieve global stability and to compute the controller and observer gains. To test controller according to realflight condition, an external disturbance signal that acts as air load is applied at the control surface input. Severalsimulations on the nonlinear system validate the dominant performance of proposed controller as compared to theexisting methods in literature.
Multi-Dimensional Index of Quality of Life: The Pakistan Case
Gilani, Bilal Ijaz,Salman, Rohail Center for Asian Public Opinion ResearchCollaborat 2014 Asian journal for public opinion research Vol.2 No.1
Quality of Life in Pakistan is an understudied and rather unexplored domain. With various definitions and challenges to explaining quality of life, a public opinion poll and scientific surveys have been conducted in order to find out more about the quality of life in Pakistan. Using a nationally representative sample, this paper seeks to identify quality of life measures, find results, and analyze them to see what they mean, specifically in the context of Pakistan.
Shuguang Li,M. Waqas,Salman A. AlQahtani,M. Ijaz Khan 한국자기학회 2023 Journal of Magnetics Vol.28 No.2
Enhancing heat transfer is of utmost importance in modern industrial applications. Pure liquids for illustration ethylene glycol, propylene glycol and water having lower conductivity are commonly used as cooling liquids in distinct applications. This approach helps conserve and optimize the enhancement of heat transportation. However, in order to achieve enhanced thermal efficiency, state-of-the-art liquids known as nanoliquids have been recommended. Thus the Buongiorno two-component nanoliquid model, which exhibits superior thermal efficiency compared to the aforementioned standard cooling liquids is being considered for formulating and analyzing the behavior of Casson nanoliquid configured by cylindrical convected surface. The problem formulation incorporates various factors such as Darcy-Forchheimer porosity, thermophoresis, magnetohydrodynamics, Brownian diffusion, suction/injection and Joule heating. Boundary-layer stretching flow is formulated. Dimensionless differential form from governing nonlinear problems is achieved by employing relevant variables. The application of the homotopy procedure results in convergent solutions for strongly nonlinear systems. The graphs are used to reveal the plots of significant factors in the analysis.