Ph.D. King Fahd University of Petroleum & Minerals Mechanical Engineering May 2020
Thesis: Dynamic Modeling, Analysis, and Control of a VAWT. Adviser: Dr. Ahmet Z. Sahin
M.S. King Fahd University of Petroleum & Minerals Mechanical Engineering May 2015
Thesis: Modeling and Implementation of Robotic Arm. Adviser: Dr. Mehmet Sunar
B.S. University of Khartoum Mechanical Engineering Aug 2011
Senior Project: Pilot Plant for Iron Production. Adviser: Dr. Mudawi Ibrahim
RESEARCH, TEACHING, or OTHER INTERESTS
Mechanical Engineering, Control and Systems Engineering, Aerospace Engineering, Industrial and Manufacturing Engineering
11
Scopus Publications
321
Scholar Citations
7
Scholar h-index
6
Scholar i10-index
Scopus Publications
An analysis approach for entropy generation in bounded solids subject to sudden heat flux Mehmet Sunar, Amin A.M. Fadlalla, Guven Yucesan, Orcun Bicer International Journal of Exergy, 2022 This work addresses the problem of entropy generation rate due to conduction for a one-dimensional bounded solid onto which a sudden heat flux is applied from one of its surfaces and the other surface is insulated. A theoretical procedure is presented using the infinite series to solve for temperature distribution with different forms of the applied heat flux. The considered cases include, but not limited to, constant, ramp and sinusoidal types of heat fluxes. The theoretical temperature results are found to be closely matching with those available in literature for one case and with those obtained by the finite element approach for all the cases. Entropy generation rate due to thermal field is presented in all the three cases with the conclusion that an energy balance is attained at some depth below the surface.
Aeroelastic Analysis of Straight-bladed Vertical Axis Wind Turbine Blade Amin Fadlalla, Ahmet Sahin, Hassen Ouakad, Haitham Bahaidarah Fme Transactions, 2022 To prevent flutter phenomena in a wind turbine, minimize vibration and increase the blades' life, a systematic analysis is required to investigate the effects between the cyclic aerodynamic loads and the structural performance of the turbine. A dynamic analysis of a straight-bladed vertical axis wind turbine (SB-VAWT) blade is investigated in this paper, and a simplified approach for the energy equations of an Eulerian beam subjected to twist and transverse bending deflections is introduced. The aerodynamic loads are estimated using the double multiple stream tube models. They are introduced into the dynamic model in the aeroelastic coupling, where the structural displacements are fed back to update the aerodynamic loads by utilizing the average acceleration method for the numerical integration of the equations. Reduced order modeling is then imposed based on the first modes of vibration. It is found that the structural displacement has little effect on the aerodynamic loads, and SBVAWTs experience higher transverse displacements compared with those in curved-blade VAWTs.
Dynamic modeling and feedback linearization control of a 3-D overhead gantry crane system Amin A.M. Fadlalla, Mohamed Hassan 2021 IEEE International Iot Electronics and Mechatronics Conference Iemtronics 2021 Proceedings, 2021 The overhead crane systems are important heavy-duty machines that are widely used, especially in construction and industry sectors to transport and lift heavy loads. This paper introduces the mathematical modeling of a 3-D overhead crane. The Euler-Lagrange equation is utilized to extract the dynamic equations of the crane system. The obtained nonlinear crane model has been linearized by applying the feedback linearization technique. Then, a PID controller has been developed and implemented to the obtained linearized crane model. The parameters of the designed PID controller have been tuned by implementing the Differential Evolution (DE) algorithm which significantly improved the performance of the PID controller. The simulation results have been performed using MATLAB/SIMULINK platform. The obtained simulation results clearly showed the impact of applying the Differential Evolution (DE) technique to tune the PID controller gains which provided better performance compared to the manually tuned PID controller gains.
Numerical investigation of a vertical axis wind turbine performance characterization using new variable pitch control scheme Amin A. Mohammed, Ahmet Z. Sahin, Hassen M. Ouakad Journal of Energy Resources Technology Transactions of the ASME, 2020 A double multiple streamtube model coupled with variable pitch methodology is used to analyze the performance characteristics of a small-scale straight-bladed Darrieus type vertical axis wind turbine (SB-VAWT). The numerical study revealed that a fixed pitch of −2.5 deg could greatly enhance the performance of the wind turbine. However, no improvement is observed in the starting torque capacity. Furthermore, the performance of upwind and downwind zones has been investigated, and it is found that the VAWT starting capacity is improved by increasing/decreasing the pitch angle upwind/downwind of the turbine. To optimize the performance, four cases of variable pitch angle schemes of sinusoidal nature were examined. The parameters of the sinusoidal functions were optimized using differential evolution (DE) algorithm with different cost functions. The results showed improvement in the power coefficient, yet with low starting capacity enhancement. Among the objective functions used in DE algorithm, the negative of the average power coefficient is found to lead to the best starting capacity with moderate peak power coefficient.
Entropy generation rate analysis in pendulum cart system undergoing damped oscillation Amin A. Mohammed, Mehmet Sunar, Ahmet Z. Sahin International Journal of Exergy, 2020 A mechanical system consisting of a cart with slender rod is considered in this work for entropy generation rate investigation via a thermodynamic analysis. The dynamic model of the system is formulated using Lagrange's equation. Entropy generation rate is then introduced as the time derivative of the net-work potential of the system. Entropy generation rate is simulated for different initial conditions and a parametric study is performed to examine the effect of different parameters such as damping and stiffness on the entropy production. It is found that, entropy generation rate follows a pattern of three peaks being repeated with time. The stiffness and initial conditions have direct effect on the entropy generation rate. In this case, increasing either property increases entropy generation rate. The maximum EGR is found to be 0.332 × 10−4 and 0.600 × 10−4 W/K for nonlinear and linearised system respectively.
Vertical axis wind turbine aerodynamics: Summary and review of momentum models Amin A. Mohammed, Hassen M. Ouakad, Ahmet Z. Sahin, Haitham M. S. Bahaidarah Journal of Energy Resources Technology Transactions of the ASME, 2019 Momentum models or streamtube models represent one of the fundamental approaches in modeling the aerodynamics of straight bladed vertical axis wind turbine (SB-VAWT) of Darrieus type. They are based on momentum (actuator disk) theory and widely used in performance evaluation of VAWTs. In this short review, the authors have strived to compile the basic momentum models that have been widely assumed in the literature for design and performance estimation of SB-VAWTs of Darrieus type. A comprehensive demonstration of the formulation needed for the implantation of these models is also proposed. Three streamtube models are investigated in this paper, namely, the single streamtube (SST), the multiple streamtube (MST), and the double multiple streamtube (DMST) models. Each of these models has it merits and demerits which are also thoroughly discussed in this review.
Modeling and simulation of entropy generation rate in pendulum cart system undergoing damped oscillation Amin A. Mohammed, M. Sunar, Ahmet Z. Sahin 2019 8th International Conference on Modeling Simulation and Applied Optimization Icmsao 2019, 2019 When exposed to a damped oscillation, a mechanical system destructs exergy while reducing the energy efficiency of the system through entropy generation. Thus, entropy generation rate (EGR) in a mechanical system undergoing a damped oscillation is necessarily to be investigated for efficient handling. A mechanical system consisting of a cart with slender rod is considered in this work for EGR via a thermodynamic analysis. The dynamic model of the system is formulated using Lagrange's equations and afterwards it is linearized for small rotation of the rod. EGR is then introduced as the time derivative of the net work potential of the system. Finally, EGR is simulated for different initial conditions and a parametric study is performed to examine the effect of different parameters such as damping and stiffness on the entropy production. It is found that, the stiffness and initial conditions have direct effect on EGR. In this case, increasing either property increases EGR, however, no general trend is observed for the effect of damping due to the coupled nature of the system.
Dynamics and Control of a Two-link Manipulator using PID and Sliding Mode Control Amin A. Mohammed, Ahmed Eltayeb 2018 International Conference on Computer Control Electrical and Electronics Engineering Iccceee 2018, 2018 A robotic arm having two links is considered in this report for modeling and control. First the dynamic model of the robot is obtained using the so-called Lagrange equation, then a robust control strategy based on the conventional sliding mode control is introduced to control the motion of the robot at specific position for pick and place tasks along with PID control scheme. The results of the two controllers are compared. From the simulation results the SMC is found to be superior to the PID controller in term of fast and robust response yet with higher control input. High join speeds are observed in case of SMC which are related to the high control signals.
Design and Simulation of a CNC Machine for Controlled Seed Irradiation in Agricultural Research AAM Fadlalla, EAS Ahmed, MBE Mohammed, OAM Fadl-Almawlaa Journal of Robotics Research (JRR) 2 (2) , 2025 2025
Modal Analysis of Beams Using Finite Element Methods AAM Fadlalla Journal of Civil and Construction Engineering Research (JCCER) 1 (1) , 2024 2024 Citations: 4
Aeroelastic Analysis and Design of Composite Wings: a Review AAM Fadlalla, MG Andika, K Abdurohman, US Yudhotomo INTERNATIONAL REVIEW 17 (5), 175 , 2024 2024
Aeroelastic Analysis of Straight-bladed Vertical Axis Wind Turbine Blade. AAM Fadlalla, AZ Sahin, HM Ouakad, H Bahaidarah FME Transactions 50 (3) , 2022 2022 Citations: 6
АЕРОЕЛАСТИЧНА АНАЛИЗА ЛОПАТИЦЕ ВЕТРОТУРБИНЕ СА РАВНИМ ЛОПАТИЦАМА ВЕРТИКАЛНЕ ОСЕ AAM Fadlalla, AZ Sahin, HM Ouakad, H Bahaidarah FME Transactions 50 (3), 512-525 , 2022 2022
An analysis approach for entropy generation in bounded solids subject to sudden heat flux M Sunar, AAM Fadlalla, G Yucesan, O Bicer International Journal of Exergy 37 (4), 412-427 , 2022 2022 Citations: 4
Dynamic modeling and feedback linearization control of a 3-d overhead gantry crane system AAM Fadlalla, M Hassan 2021 IEEE International IOT, Electronics and Mechatronics Conference … , 2021 2021 Citations: 16
Numerical investigation of a vertical axis wind turbine performance characterization using new variable pitch control scheme AA Mohammed, AZ Sahin, HM Ouakad Journal of Energy Resources Technology 142 (3), 031302 , 2020 2020 Citations: 13
Parametric study and comparison of aerodynamics momentum-based models for straight-bladed vertical axis wind turbines AA Mohammed, HM Ouakad, AZ Sahin, HMS Bahaidarah Arabian Journal for Science and Engineering 45 (2), 729-741 , 2020 2020 Citations: 7
Entropy generation rate analysis in pendulum cart system undergoing damped oscillation AA Mohammed, M Sunar, AZ Sahin International Journal of Exergy 31 (3), 217-231 , 2020 2020
Vertical axis wind turbine aerodynamics: summary and review of momentum models AA Mohammed, HM Ouakad, AZ Sahin, HMS Bahaidarah Journal of Energy Resources Technology 141 (5), 050801 , 2019 2019 Citations: 74
Modeling and Simulation of Entropy Generation Rate in Pendulum Cart System Undergoing Damped Oscillation AA Mohammed, M Sunar, AZ Sahin 2019 8th International Conference on Modeling Simulation and Applied … , 2019 2019 Citations: 1
Dynamics and Control of a Two-link Manipulator using PID and Sliding Mode Control AA Mohammed, A Eltayeb 2018 International Conference on Computer, Control, Electrical, and … , 2018 2018 Citations: 47
Dynamics and Control of a Robotic Arm Having Four Links HM Al-Qahtani, AA Mohammed, M Sunar Arabian Journal for Science and Engineering, 12 , 2016 2016 Citations: 45
Kinematics Modeling of a 4-DOF Robotic Arm AAMM Sunar 2015 International Conference on Control, Automation and Robotics, 87-91 , 2015 2015 Citations: 104
Modeling and Implementation of Robotic Arm AAM Fadlalla PQDT-Global , 2015 2015
MOST CITED SCHOLAR PUBLICATIONS
Kinematics Modeling of a 4-DOF Robotic Arm AAMM Sunar 2015 International Conference on Control, Automation and Robotics, 87-91 , 2015 2015 Citations: 104
Vertical axis wind turbine aerodynamics: summary and review of momentum models AA Mohammed, HM Ouakad, AZ Sahin, HMS Bahaidarah Journal of Energy Resources Technology 141 (5), 050801 , 2019 2019 Citations: 74
Dynamics and Control of a Two-link Manipulator using PID and Sliding Mode Control AA Mohammed, A Eltayeb 2018 International Conference on Computer, Control, Electrical, and … , 2018 2018 Citations: 47
Dynamics and Control of a Robotic Arm Having Four Links HM Al-Qahtani, AA Mohammed, M Sunar Arabian Journal for Science and Engineering, 12 , 2016 2016 Citations: 45
Dynamic modeling and feedback linearization control of a 3-d overhead gantry crane system AAM Fadlalla, M Hassan 2021 IEEE International IOT, Electronics and Mechatronics Conference … , 2021 2021 Citations: 16
Numerical investigation of a vertical axis wind turbine performance characterization using new variable pitch control scheme AA Mohammed, AZ Sahin, HM Ouakad Journal of Energy Resources Technology 142 (3), 031302 , 2020 2020 Citations: 13
Parametric study and comparison of aerodynamics momentum-based models for straight-bladed vertical axis wind turbines AA Mohammed, HM Ouakad, AZ Sahin, HMS Bahaidarah Arabian Journal for Science and Engineering 45 (2), 729-741 , 2020 2020 Citations: 7
Aeroelastic Analysis of Straight-bladed Vertical Axis Wind Turbine Blade. AAM Fadlalla, AZ Sahin, HM Ouakad, H Bahaidarah FME Transactions 50 (3) , 2022 2022 Citations: 6
Modal Analysis of Beams Using Finite Element Methods AAM Fadlalla Journal of Civil and Construction Engineering Research (JCCER) 1 (1) , 2024 2024 Citations: 4
An analysis approach for entropy generation in bounded solids subject to sudden heat flux M Sunar, AAM Fadlalla, G Yucesan, O Bicer International Journal of Exergy 37 (4), 412-427 , 2022 2022 Citations: 4
Modeling and Simulation of Entropy Generation Rate in Pendulum Cart System Undergoing Damped Oscillation AA Mohammed, M Sunar, AZ Sahin 2019 8th International Conference on Modeling Simulation and Applied … , 2019 2019 Citations: 1
Design and Simulation of a CNC Machine for Controlled Seed Irradiation in Agricultural Research AAM Fadlalla, EAS Ahmed, MBE Mohammed, OAM Fadl-Almawlaa Journal of Robotics Research (JRR) 2 (2) , 2025 2025
Aeroelastic Analysis and Design of Composite Wings: a Review AAM Fadlalla, MG Andika, K Abdurohman, US Yudhotomo INTERNATIONAL REVIEW 17 (5), 175 , 2024 2024
АЕРОЕЛАСТИЧНА АНАЛИЗА ЛОПАТИЦЕ ВЕТРОТУРБИНЕ СА РАВНИМ ЛОПАТИЦАМА ВЕРТИКАЛНЕ ОСЕ AAM Fadlalla, AZ Sahin, HM Ouakad, H Bahaidarah FME Transactions 50 (3), 512-525 , 2022 2022
Entropy generation rate analysis in pendulum cart system undergoing damped oscillation AA Mohammed, M Sunar, AZ Sahin International Journal of Exergy 31 (3), 217-231 , 2020 2020
Modeling and Implementation of Robotic Arm AAM Fadlalla PQDT-Global , 2015 2015
