All Outputs (25)

LGI-rPPG-Net: A shallow encoder-decoder model for rPPG signal estimation from facial video streams (2023)
Journal Article
Chowdhury, M. H., Chowdhury, M. E., Reaz, M. B. I., Md Ali, S. H., Rakhtala, S. M., Murugappan, M., …Khandakar, A. (2024). LGI-rPPG-Net: A shallow encoder-decoder model for rPPG signal estimation from facial video streams. Biomedical Signal Processing and Control, 89, Article 105687. https://doi.org/10.1016/j.bspc.2023.105687

A method to accurately estimate physiological signals from video streams at a minimal cost is invaluable. The importance of such a technique in pre-clinical health monitoring cannot be understated. Remote photoplethysmography (rPPG) can be used as a... Read More about LGI-rPPG-Net: A shallow encoder-decoder model for rPPG signal estimation from facial video streams.

A novel combined DTC method and SFOC system for three-phase induction machine drives with PWM switching method (2023)
Journal Article
Dahmardeh, H., Ghanbari, M., & Rakhtala, S. M. (2023). A novel combined DTC method and SFOC system for three-phase induction machine drives with PWM switching method. Journal of Operation and Automation in Power Engineering, 11(2), 76-82. https://doi.org/10.22098/JOAPE.2023.9717.1679

In this paper, a novel combined Direct Torque Control (DTC) method and Stator-Flux Oriented Control (SFOC) system to increase general performances of Three-Phase Induction Motor (TPIM) drives is proposed. The introduced control scheme includes merits... Read More about A novel combined DTC method and SFOC system for three-phase induction machine drives with PWM switching method.

Development and control of an upper limb rehabilitation robot via ant colony optimization -PID and Fuzzy-PID controllers (2022)
Journal Article
Mirrashid, N., Alibeiki, E., & Rakhtala, S. M. (2022). Development and control of an upper limb rehabilitation robot via ant colony optimization -PID and Fuzzy-PID controllers. International Journal of Engineering, 35(8), 1488-1493. https://doi.org/10.5829/IJE.2022.35.08B.04

The control of movement rehabilitation robots is necessary for the recovery of physically disabled patients and is an interesting open problem. This paper presents a mathematical model of the upper limb rehabilitation robot using Euler-Lagrange appro... Read More about Development and control of an upper limb rehabilitation robot via ant colony optimization -PID and Fuzzy-PID controllers.

Real-time implementation of a super twisting control algorithm for an upper limb wearable robot (2022)
Journal Article
Fazli, E., Rakhtala, S. M., Mirrashid, N., & Karimi, H. R. (2022). Real-time implementation of a super twisting control algorithm for an upper limb wearable robot. Mechatronics, 84, Article 102808. https://doi.org/10.1016/j.mechatronics.2022.102808

This paper proposes a robust nonlinear controller for an active orthosis. The system is composed of the upper limb orthosis worn by the arm, which can be represented by a nonlinear second-order dynamical model. A robust control strategy is developed... Read More about Real-time implementation of a super twisting control algorithm for an upper limb wearable robot.

PEM fuel cell system to extend the stack life based on a PID-PSO controller design (2022)
Journal Article
Ghasemi, J., Rakhtala, S. M., Rasekhi, J., & Dokhtala, S. R. (2022). PEM fuel cell system to extend the stack life based on a PID-PSO controller design. Complex Engineering Systems, 2(1), Article 4. https://doi.org/10.20517/ces.2022.02

In this paper, the nonlinear model of polymer exchange membrane (PEM) fuel cell system is first extracted and then tested and evaluated for various temperatures and pressures. With the severe nonlinear characteristics of the PEM fuel cell system, usi... Read More about PEM fuel cell system to extend the stack life based on a PID-PSO controller design.

Nonlinear robust controller design for an upper limb rehabilitation robot via variable gain super twisting sliding mode (2022)
Journal Article
Mirrashid, N., Alibeiki, E., & Rakhtala, S. M. (2022). Nonlinear robust controller design for an upper limb rehabilitation robot via variable gain super twisting sliding mode. International Journal of Dynamics and Control, 10(6), 1996-2010. https://doi.org/10.1007/s40435-021-00902-4

Rehabilitation robots have an effective role in helping patients with physical disabilities. Therefore, improving their performance is very important. In this paper, a robust nonlinear controller is proposed for the upper limb rehabilitation robot. T... Read More about Nonlinear robust controller design for an upper limb rehabilitation robot via variable gain super twisting sliding mode.

Self-tuning fuzzy logic PID controller with a practical view to PEM fuel cell air supply system (2021)
Journal Article
Rakhtala, S. M. (2021). Self-tuning fuzzy logic PID controller with a practical view to PEM fuel cell air supply system. International Journal of Modelling, Identification and Control, 37(2), 187-198. https://doi.org/10.1504/IJMIC.2021.120202

Polymer electrolyte membrane fuel cells (PEMFC) are proper candidates as energy resources for using in vehicular, industry and other applications. This paper concentrates on the nonlinear model of PEMFC system. Since the variation of the load current... Read More about Self-tuning fuzzy logic PID controller with a practical view to PEM fuel cell air supply system.

Real time control and fabrication of a soft robotic glove by two parallel sensors with MBD approach (2021)
Journal Article
Rakhtala, S. M., & Ghayebi, R. (2022). Real time control and fabrication of a soft robotic glove by two parallel sensors with MBD approach. Medical Engineering and Physics, 100, Article 103743. https://doi.org/10.1016/j.medengphy.2021.103743

Soft robotic gloves were designed to aid the rehabilitation process with hand pathologies and coordination of gripping exercises. The main issue in soft robotic actuators is to design a control strategy to overcome deformation in grasping exercises.... Read More about Real time control and fabrication of a soft robotic glove by two parallel sensors with MBD approach.

Simulation and hardware implementation of a sensorless modified MPTC for 3φ induction motor drives (2021)
Journal Article
Ahmadi Taleshian, M., Ghanbari, M., & Rakhtala, S. M. (2021). Simulation and hardware implementation of a sensorless modified MPTC for 3φ induction motor drives. International Transactions on Electrical Energy Systems, 31(12), Article e13118. https://doi.org/10.1002/2050-7038.13118

Model predictive torque control (MPTC) is developing as a high-performance control system for 3φ induction motor (IM) drives due to its simple structure and fast dynamic response. This paper proposes a sensorless modified MPTC (MMPTC) strategy to con... Read More about Simulation and hardware implementation of a sensorless modified MPTC for 3φ induction motor drives.

A developed combined control method for induction machine drives based on PWM (2021)
Journal Article
Dahmardeh, H., Ghanbari, M., & Rakhtala, S. M. (2021). A developed combined control method for induction machine drives based on PWM. COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, 40(3), 624-639. https://doi.org/10.1108/COMPEL-11-2020-0367

Purpose: The purpose of this paper is to develop a combined control (CC) technique based on the direct torque control (DTC) strategy and vector control (VC) method, to improve the overall performance of a three-phase induction machine (TPIM) drives.... Read More about A developed combined control method for induction machine drives based on PWM.

Real-time voltage control based on a cascaded super twisting algorithm structure for DC-DC converters (2021)
Journal Article
Rakhtala, S. M., & Casavola, A. (2022). Real-time voltage control based on a cascaded super twisting algorithm structure for DC-DC converters. IEEE Transactions on Industrial Electronics, 69(1), 633-641. https://doi.org/10.1109/TIE.2021.3051551

This article proposes a second-order sliding mode control law, based on a super twisting algorithm (STA), aimed at regulating the output voltage of a dc-dc buck converter. A closed-loop system is designed consisting of two distinct nested loops organ... Read More about Real-time voltage control based on a cascaded super twisting algorithm structure for DC-DC converters.

Adaptive gain super twisting algorithm to control a knee exoskeleton disturbed by unknown bounds (2020)
Journal Article
Rakhtala, S. M. (2021). Adaptive gain super twisting algorithm to control a knee exoskeleton disturbed by unknown bounds. International Journal of Dynamics and Control, 9(2), 711-726. https://doi.org/10.1007/s40435-020-00686-z

Knee exoskeletons as wearable robots have been increasingly aimed to assist elderly and disabled people to increase their movement abilities through flexion/extension execution of the knee. In this paper, a robust controller was suggested for a new k... Read More about Adaptive gain super twisting algorithm to control a knee exoskeleton disturbed by unknown bounds.

Voltage and frequency regulation in an islanded microgrid with PEM fuel cell based on a fuzzy logic voltage control and adaptive droop control (2020)
Journal Article
Roudbari, E. S., Beheshti, M. T. H., & Rakhtala, S. M. (2020). Voltage and frequency regulation in an islanded microgrid with PEM fuel cell based on a fuzzy logic voltage control and adaptive droop control. IET Power Electronics, 13(1), 78-85. https://doi.org/10.1049/iet-pel.2019.0592

Nowadays, the demand for electrical energy is increasing, and conventional power systems will face major problems in the future if they cannot generate extra demand for electrical energy. One of the best solutions for solving extra demand for electri... Read More about Voltage and frequency regulation in an islanded microgrid with PEM fuel cell based on a fuzzy logic voltage control and adaptive droop control.

Boost converter topologies, hybrid boost and new topologies of voltage multiplier in photovoltaic systems (2019)
Journal Article
Samadi, M., Rakhtala, S. M., & Ahmadian Alashti, M. (2019). Boost converter topologies, hybrid boost and new topologies of voltage multiplier in photovoltaic systems. Journal of Solar Energy Research, 4(4), 287-299. https://doi.org/10.22059/jser.2020.295264.1135

Renewable energy generation has experienced lot growth in the last not many years, with close to several billion dollars financing in 2017. Selection of an appropriate converter is one of the challenges since it has an impact on the behavior of the P... Read More about Boost converter topologies, hybrid boost and new topologies of voltage multiplier in photovoltaic systems.

Reducing cost and size in photovoltaic systems using three-level boost converter based on fuzzy logic controller (2018)
Journal Article
Samadi, M., & Rakhtala, S. M. (2019). Reducing cost and size in photovoltaic systems using three-level boost converter based on fuzzy logic controller. Iranian Journal of Science and Technology Transactions of Electrical Engineering, 43, 313-323. https://doi.org/10.1007/s40998-018-0145-6

Photovoltaic (PV) systems are dependent on two main factors of temperature and solar radiation, changing the PV system into a nonlinear system. Therefore, it is necessary to propose an intelligent control system for power control of PV systems to tac... Read More about Reducing cost and size in photovoltaic systems using three-level boost converter based on fuzzy logic controller.

Robust control design for air breathing proton exchange membrane fuel cell system via variable gain second-order sliding mode (2018)
Journal Article
Mirrashid, N., Rakhtala, S. M., & Ghanbari, M. (2018). Robust control design for air breathing proton exchange membrane fuel cell system via variable gain second-order sliding mode. Energy Science and Engineering, 6(3), 126-143. https://doi.org/10.1002/ese3.199

The nonlinear and time-dependent characteristic and unknown modeling uncertainty of proton exchange membrane fuel cell (PEMFC) such as complex electro-chemical, thermal, and fluid mechanic phenomena make its controller design quite challenging. In th... Read More about Robust control design for air breathing proton exchange membrane fuel cell system via variable gain second-order sliding mode.

Design Output Control TLB Converter for DC Drive Applications with photovoltaic power supply (2017)
Journal Article
Samadi, M., & Rakhtala, M. (2017). Design Output Control TLB Converter for DC Drive Applications with photovoltaic power supply. Journal of Solar Energy Research, 2(3), 105-110

Using conventional boost converter in photovoltaic system as the interface between the photovoltaic panel and the consumer is widely practiced. In this paper, instead of using conventional boost converter, the three-level boost converter (TLBC) has b... Read More about Design Output Control TLB Converter for DC Drive Applications with photovoltaic power supply.

Design of second order sliding mode and sliding mode algorithms: A practical insight to DC-DC buck converter (2017)
Journal Article
Rakhtala, S. M., Yasoubi, M., & HosseinNia, H. (2017). Design of second order sliding mode and sliding mode algorithms: A practical insight to DC-DC buck converter. IEEE Caa Journal of Automatica Sinica, 4(3), 483-497. https://doi.org/10.1109/JAS.2017.7510550

This paper presents a simple and systematic approach to design second order sliding mode controller for buck converters. The second order sliding mode control U+0028 SOSMC U+0029 based on twisting algorithm has been implemented to control buck switch... Read More about Design of second order sliding mode and sliding mode algorithms: A practical insight to DC-DC buck converter.

Twisting control algorithm for the yaw and pitch tracking of a twin rotor UAV (2017)
Journal Article
Rakhtala, S. M., & Ahmadi, M. (2017). Twisting control algorithm for the yaw and pitch tracking of a twin rotor UAV. International Journal of Automation and Control, 11(2), 143-163. https://doi.org/10.1504/IJAAC.2017.083296

In this paper, second order sliding mode controller is used to compensate the pitch and yaw angles of multivariable (MIMO) twin rotor system. Twin rotor has six state variables including yaw and pitch angles, yaw and pitch angular velocities, and arm... Read More about Twisting control algorithm for the yaw and pitch tracking of a twin rotor UAV.

Robust feedback linearization control of air-feed system in PEM fuel cell against practical uncertainty (2016)
Journal Article
Rakhtala, S. M., & Ranjbar, . A. (2016). Robust feedback linearization control of air-feed system in PEM fuel cell against practical uncertainty. Electrica, 16(1), 1981-1994

In this paper robust feedback linearization control approach based on the gap metric analysis is proposed to control a Proton Exchange Membrane Fuel Cell (PEMFC). The oxygen excess ratio ( ) is regulated through adjustment of the air supply to avoid... Read More about Robust feedback linearization control of air-feed system in PEM fuel cell against practical uncertainty.