Mahmood Pervaiz

COMSATS Institute of Information Technology, EE, Faculty Member

Followers

Following

Mentions

Public Views

Dr. Mahmood Pervaiz is teaching in the Islamabad campus of Comsats Institute of Information Technology (CIIT). He is a passionate teacher who has been with CIIT since 2002, involved in teaching and supervising the graduate and the undergraduate students. He joined the CIIT Abbottabad campus in August 2002 as teacher and in-charge electrical engineering department after serving for twenty nine years in the industry. There he had been involved in various industrial projects in the field of electronics. Before coming to Islamabad campus, during his stay in Abbottabad with the electrical engineering department, he had been involved in teaching, curriculum revision, laboratory equipment development and prototyping and sports activities.
He started his career as a trainee at a multinational electronic component manufacturing company in Lahore after securing his Masters in Physics from the Punjab University Lahore in 1973. Within six months promoted to assistant engineer and served till the company shifted to Indonesia in April 1975. His passion for electronics kept him restless for next two years until he joined Dr. A. Q. Khan research laboratories (KRL). During these two years he served Pakistan Air Force as Flying officer in education branch and Radio Pakistan as a radio engineer. As a senior scientific officer and head of a group in KRL, he contributed in the development of high-speed variable-frequency inverters which is the backbone of the centrifuge process. Furthermore, till Dec. 1981, he had been involved in setting up production facilities for inverters and other electronic equipment. Dr. Mahmood continued his journey of acquiring knowledge through extensive traveling and trainings while working with multinational organizations, Ms Schlumberger where he contributed as an instrument engineer at the Abudhabi base in the UAE. His contribution for Schlumberger was setting up a printed circuit board repair lab in Abudhabi to provide maintenance support to all bases operating under this center. He enjoyed travelling throughout the UAE and participated in various training programs in different places. Working with people from different nationalities having different cultural background may be quite interesting. But his experience of travelling in southern parts of Pakistan was more interesting, exciting and challenging. In his last twelve months with Schlunberger before switching to another job, he was working on various oil wells for maintenance of data logging tools and surface logging equipment. Besides good earnings, travelling and interacting with different people, his quest for learning and practicing electronics was not being fulfilled. Moreover, he wanted to give more time to his family. He decided to switch the job and joined the National Institute of Electronics (NIE) Islamabad in 1986, as a head of automation and control group. His contribution during eleven years with NIE includes, acquiring funds for research and development projects from the ministry of planning and development, training of teachers, design, development and implementation of industrial control system and various reverse engineering projects. Before joining the CIIT, he has been working with defense organizations on various reverse engineering and design development projects as an entrepreneur. In the capacity of self employment as a consultant with CIIT in 2001, he had established a design and development laboratory of advanced digital circuits in the CIIT Islamabad campus.

less

Interests

Uploads

Papers by Mahmood Pervaiz

Adaptive Backstepping Integral Sliding Mode Control of a MIMO Separately Excited DC Motor

Robotics

This research proposes a robust nonlinear hybrid control approach to the speed control of a multi... more This research proposes a robust nonlinear hybrid control approach to the speed control of a multi-input-and-multi-output separately excited DC motor (SEDCM). The motor that was under consideration experienced parametric uncertainties and load disturbances in the weak field region. The proposed technique aims to merge the benefits of adaptive backstepping (AB) and integral sliding mode control (ISMC) to enhance the overall system’s robustness. The unknown parameters with load disturbances are estimated using an adaptation law. These estimated parameters are incorporated into the controller design, to achieve a highly robust controller. The theoretical stability of the system is proved using the Lyapunov stability criteria. The effectiveness of the proposed AB–ISMC was demonstrated by simulation, to track the reference speed under parametric uncertainties and load disturbances. The control performance of the proposed technique was compared to that of feedback linearization (FBL), conv...

Download

Hybrid Backstepping-Super Twisting Algorithm for Robust Speed Control of a Three-Phase Induction Motor

Electronics

This paper proposes a Hybrid Backstepping Super Twisting Algorithm for robust speed control of a ... more This paper proposes a Hybrid Backstepping Super Twisting Algorithm for robust speed control of a three-phase Induction Motor in the presence of load torque uncertainties. First of all, a three-phase squirrel cage Induction Motor is modeled in MATLAB/Simulink. This is then followed by the design of different non-linear controllers, such as sliding mode control (SMC), super twisting SMC, and backstepping control. Furthermore, a novel controller is designed by the synergy of two methods, such as backstepping and super twisting SMC (Back-STC), to obtain the benefits of both techniques and, thereby, improve robustness. The sigmoid function is used with an exact differentiator to minimize the high-speed discontinuities present in the input channel. The efficacy of this novel design and its performance were evidenced in comparison with other methods, carried out by simulations in MATLAB/Simulink. Regression parameters, such as ISE (Integral Square error), IAE (Integral Absolute error) and ...

Download

State and Disturbance Observer Based Control for a Class of Linear Uncertain Systems

2017 International Conference on Frontiers of Information Technology (FIT), 2017

The disturbance observer based stabilization of a generalized linear uncertain system is studied.... more The disturbance observer based stabilization of a generalized linear uncertain system is studied. All the states variables are assumed to be immeasurable and are not available in feedback to the designed controller and disturbance estimator. Firstly, for the purpose of state estimation Luenberger observer is investigated. In addition, to eradicate the influence of norm bounded disturbance a linear disturbance observer is designed in the second step. Finally, an algorithm based on state feedback controller is designed to regulate the states trajectories to the origin. To validate the effectiveness of proposed scheme a numerical example is provided.

Robust Stabilization for Non-linear Applications of Cyber Physical Systems

GSTF Journal of Engineering Technology

The stabilization of unstable non-linear compositions is an important and complex phenomenon acro... more The stabilization of unstable non-linear compositions is an important and complex phenomenon across the worldwide. The purpose of this research is to model a robust control design for the stabilization of non-linear, unstable, and under actuated applications of Cyber Physical Systems (CPS) using the High Performance Sliding Mode Control (HPSMC) methodology, which has a negligible control errors (chattering) phenomenon. This study focuses on the designing of feedback controllers by means of HPSMC for two applications of CPS i.e., inverted pendulum system and mass spring damper system, both representing non-linear structures. The SMC procedure is based on saturated approximation of the control laws in order to obtain balanced and controlled behavior at, 1) minimum stabilizing time, and 2) unstable equilibrium points while producing negligible chattering occurrences. This technique provides a robust platform for the non-linear, unstable, and under actuated applications of CPS. The systems’ narrations, control objectives, and implementation results of robust feedback controllers are drawn attention to evaluate the reduced control error performance.

Nonlinear Adaptive Backstepping Control of Permanent Magnet Synchronous Motor

This paper addresses the speed tracking problem of a permanent magnet synchronous motor (PMSM) un... more This paper addresses the speed tracking problem of a permanent magnet synchronous motor (PMSM) under the influence of parametric uncertainties and external load torque disturbances. The nonlinear dynamics associated with both PMSM and load is considered time variant and uncertain. Two robust controllers, namely, backstepping and adaptive backstepping are designed to drive the speed of a PMSM to a predefined trajectory. The backstepping controller is used to stabilize and control the speed of motor while the uncertain parameters and disturbances are estimated by adaptive laws. These adaptation laws and the use of performance improvement term in the backstepping control reduce the gain requirements. The stability analysis of both the controllers via Lyapunov method ensures the asymptotic convergence of the overall close loop system. Theoretical analysis is presented to summarize characteristics of both the controllers. Numerical simulations are provided to verify effectiveness of the ...

Download

Nonlinear robust control of a variable speed-wind turbine

2018 International Conference on Engineering and Emerging Technologies (ICEET), 2018

This paper is aimed at designing a nonlinear robust control techniques for two mass model of vari... more This paper is aimed at designing a nonlinear robust control techniques for two mass model of variable speed wind turbine (VSWT) with better performance parameters and capability of rejection of disturbances. Sliding Mode Control (SMC) is the most widely used robust controller. The control scheme based on SMC ensures that system state (rotor speed) of VSWT will converge to a desired speed in finite time. However, in conventional SMC the system is robust against matched uncertainties only. Therefore an integral SMC is presented that eliminate the effect of both match and mismatch uncertainties. Integral SMC (ISMC) is presented to track the speed of rotor of VSWT with an improved performance of the system at the cost of eliminating the effect of mismatch uncertainties.

A Disturbance Observer Based Sliding Mode Control for Variable Speed Wind Turbine

IETE Journal of Research

Beyond Linear Control Approaches - Sliding Mode Control of Flexible Robotic Manipulator

2016 International Conference on Frontiers of Information Technology (FIT), 2016

Dynamic adaptive backstepping based Integral sliding mode for non triangular uncertain nonlinear systems

Mathematical Problems in Engineering, 2014

Dynamic Adaptive Backstepping based Integral Sliding Control for Nontriangular Uncertain Nonlinear Systems

Mathematical Problems in Engineering

Steadiness of real time inverted pendulum

Proceedings of 2013 10th International Bhurban Conference on Applied Sciences & Technology (IBCAST), 2013

ABSTRACT In the area of control theory and engineering, the stabilization of an inverted pendulum... more ABSTRACT In the area of control theory and engineering, the stabilization of an inverted pendulum with the help of moving cart is one of the attractive regulation problem. It is a perfect benchmark for testing of a wide range of classical and modern control techniques. In this paper Sliding Mode Control (SMC) technique is used to design a control law for stabilization of one stage cart-pole type inverted pendulum system. The chattering problem is solved by using saturation function. The simulations and experimental results are highlighted to evaluate the robustness of the control design.

Dynamical Adaptive Integral Sliding Backstepping Control of Nonlinear Nontriangular Uncertain Systems

Mathematical Problems in Engineering, 2014

ABSTRACT We present a control strategy for nonlinear nontriangular uncertain systems. The propose... more ABSTRACT We present a control strategy for nonlinear nontriangular uncertain systems. The proposed control method is a synergy between the dynamic adaptive backstepping (DAB) and integral sliding mode (ISM) and is referred to as DAB-ISMC. Our main objective is to find a recursive procedure to transform a nontriangular system into an implementable form that enables designing a control law which almost eliminates the reaching-phase. The proposed method further facilitates minimization of chattering which is believed to be a shortcoming of the sliding mode control. In this methodology, the ISM, as an integrated subsystem of DAB, is introduced at the final stage of backstepping. This strategy works very well to obtain a system that is robust against model imperfections, matching and unmatching uncertainties. The DAB-ISMC method is applied on a continuous stirred tank reactor (CSTR) and simulation results obtained on Matlab are found to be very promising.

Smart security system for sensitive area using face recognition

2013 IEEE Conference on Sustainable Utilization and Development in Engineering and Technology (CSUDET), 2013

ABSTRACT Face recognition play a vital role in variety of applications from biometrics, surveilla... more ABSTRACT Face recognition play a vital role in variety of applications from biometrics, surveillance, security, identification to the authentication. In this paper we design and implement a smart security system for restricted area where access is limited to people whose faces are available in the training database. First we are going to detect the face by detecting the human motion. Then face recognition is performed to determine the authority of the person to enter the sensitive area. At the same time, we track the coordinate of detected motion. Failing to recognize the face finally passes the estimated coordinate to anesthetic gun for targeting the intruder automatically. Experimental results demonstrate the effectiveness of proposed security system in order to restrict the unauthorized access and enhanced reliability by use of face recognition.

Output Tracking via Adaptive Backstepping Higher Order Integral Sliding Mode for Uncertain Nonlinear Systems

Discrete Dynamics in Nature and Society, 2014

ABSTRACT The authors propose a new tracking control design strategy for uncertain non-linear syst... more ABSTRACT The authors propose a new tracking control design strategy for uncertain non-linear systems which are convertible to Semi-Strict Feedback Form (SSFF). The system in SSFF is first converted into new variables via existing adaptive backstepping control techniques. The control law is obtained by combining adaptive backstepping procedure and higher order integral sliding mode. The component of control law designed via backstepping is continuous which shows robustness against parametric uncertainties where as the discontinuous control component provides robustness against unmodeled dynamics and external disturbances. Since, this strategy relies on an integral manifold of the adaptively developed variables, therefore, the reaching phase is eliminated in this approach, which is an advantage in term of robustness. Furthermore, the parameters update law correctly provides the estimation of parameters which is again results in enhanced robustness of the strategy. The stability of proposed method is analysed theoretically and validated through a numerical example.