Mohamed Mahmoud Mohamed Abd Elhafiz

Verified @m-eng.capu.edu.eg

Faculty of Engineering, Helwan Univeriety
Professor

Mohamed Mahmoud Mohamed Abd Elhafiz


                  Download Compact PDF  
https://researchid.co/mohamedabdelhafez

RESEARCH, TEACHING, or OTHER INTERESTS

Automotive Engineering, Mechanical Engineering
8

Scopus Publications

42

Scholar Citations

5

Scholar h-index

Scopus Publications

  • Tire-Soil Interaction Simulation Using Finite Element Method to Investigate Their Deformation and Sinkage
    Mahmoud Adel Mohamed, Sayed Elhussieny, Mohamed Ali Emam, Mohamed M. Abd Elhafiz
    SAE Technical Papers, 2023
    <div class="section abstract"><div class="htmlview paragraph">This research investigates the tire deformation and sandy soil sinkage on the performance of off-road vehicles. Tire deformation and soil sinkage were simulated with the Finite Element Method (FEM) using ANSYS Workbench 2020 R2 and validated using actual results taken from a previous work of tire size (235/70 R15) under four different tire inflation pressures (50, 100, 150, and 200 kPa) and three soil densities varying from loose, medium dense, and high dense sand. The optimum tire inflation pressures were obtained under various soil densities to achieve flotation pressure of the tires on the soil to generate good performance and accomplish the off-road vehicle missions.</div></div>
  • Control Strategy of Diesel Engine Hybrid Starter System
    M. A. Abouzaid, M. E. Bahgat, M. Watany, Mohamed M. Abd Elhafiz
    SAE Technical Papers, 2023
    <div class="section abstract"><div class="htmlview paragraph">This article presents, a prototype to control a duel starting system for diesel engines. A pneumatic starter has been proposed as an additional choice for the engine starting system to overcome the conventional starting system fail, especially on the faraway roads. Starting management between pneumatic and electric starting systems has been controlled by an electronic control unit (ECU) based on air pressure levels. The automatic controller hardware is automated using the Automation Studio program and then controllers were assembled and programmed to build ECU. MATLAB/SIMULINK software have been used to investigate the performance of both electric and pneumatic starting systems to assess the proposed pneumatic starter. In conclusion, the battery life can be increased, and the size, mass, and battery capacity can be reduced.</div></div>
  • Theoretical Investigation of Spokes Geometry of Non-Pneumatic Tires for Off-Road Vehicles
    Ahmad Aboulyazid, Mohamed Watany, Mohamed M. Abd Elhafiz
    SAE Technical Papers, 2021
    <div class="section abstract"><div class="htmlview paragraph">Extensive studies of off-road non-pneumatic tires (NPTs) were conducted for light and heavy equipment due to their advantages over conventional pneumatic tires in terms of low rolling resistance, thus no need for air pressure maintenance. Finite element (FE) simulations of NPT contact pressure, contact shear stress, vertical stiffness, von mises stress, and rolling resistance were performed using ABAQUS software in a series of vertical loads to simulate tire models of three different spokes geometries on unpaved soil to verify NPT performance under different conditions. The spokes geometries were hexagonal (honeycomb) spoke, hexagonal re-entrant (Lattice) spoke and spoke with curvature called spoke pairs. It was found that the rolling resistance of the honeycomb structure has the lowest value, while the contact shear stress and contact pressure were the highest.</div></div>
  • Dual Starting System Modeling of Vehicle Engine
    M. A. Abouzaid, M. E. Bahgat, M. Watany, Mohamed M. Abd Elhafiz
    SAE International Journal of Commercial Vehicles, 2021
    <div>The article introduces modeling and simulation of a hybrid vehicle model starter system consisting of electric and pneumatic motor concepts. The electric drive system is driven by a direct current (DC) permanent magnet motor, while the pneumatic drive system is driven by a pneumatic drive. In the proposed system, an air starter was used as an auxiliary system to the current electric start method, and air start was used as the primary starting system as long as the air pressure was permissible, and when the air pressure was insufficient, the electric starting system would come into operation. MATLAB SIMULINK-SIMCAP are instrument environments that have been used to model and simulate electrical and pneumatic drive system components including the battery, DC motor, compressor tank, directional control valve, pneumatic actuator, and load produced while the motor is in motion. The performance of the proposed initiation systems has been analyzed and investigated. This technology is effective for reliable starting and increasing the service life of both the battery and the starter motor, as well as the safety of the vehicle and passengers. Moreover, the pneumatic system has other uses in tractors and commercial vehicles (such as trucks, tractors, and buses) such as opening/closing doors and/or the braking system (infrastructure that already exists). Therefore, there is no need to build another system.</div>
  • Performance Evaluation of Magnetorheological Limited Slip Differential for Automotive Applications
    Mohamed M. Abd elhafiz, H. Metered
    SAE Technical Papers, 2018
    <div class="section abstract"><div class="htmlview paragraph">The present work investigates the effect of magnetorheological fluid (MRF) on limited slip differential (LSD) system for automotive applications to improve torque distribution which influences traction and maneuverability. The proposed differential system uses a magnetorheological fluid which permits to control the locking torque effectively and then improve the vehicle traction characteristics. To evaluate the proposed system, a prototype model involves some rotating clutches submerged in MRF associated with an electromagnet coil was built. Experimental tests were carried out in two cases, first case by applying mechanical force on the friction clutches and the second by applying magnetic field to change the MRF viscosity. The yield stress of MRF depends on the magnetic field applied by the electromagnet by varying electric current. The controllable yield stress generates friction force on the rotating clutches surfaces to transmit torque. The transmitted torque was measured to evaluate the advantages of MRF in classic LSD. The results reveal that proposed MR-LSD can improve automotive traction.</div></div>
  • Vibration Control of Active Vehicle Suspension System Using Optimized Fuzzy-PID
    H. El-taweel, Mohamed M. Abd elhafiz, H. Metered
    SAE Technical Papers, 2018
    <div class="section abstract"><div class="htmlview paragraph">In this paper, a fuzzy-PID controller is applied in a half vehicle active suspension system to enhance vibration levels of vehicle chassis and passenger seat. The fuzzy-PID controller consists of fuzzy and PID connecting in a series manner, the fuzzy output is considered as the PID input. Genetic Algorithm (GA) is selected to tune controller parameters to obtain optimal values that minimize the objective function. The equations of motion of five-degrees-of-freedom active half-vehicle suspension system are derived and simulated using Matlab/Simulink software. Double bumps and random road excitations are used to study the performance of suspension systems including bounce and pitch motion. The performance of the active suspension system using optimized fuzzy-PID controller is compared with conventional passive to show the efficiency of the proposed active suspension system. The simulation results prove that the active suspension system controlled using the optimized fuzzy-PID controller can offer significant improvements of ride comfort and vehicle stability.</div></div>
  • Modeling and simulation of off-road vehicle mobility with driving torque distribution control on split adhesion conditions
    M.M. Abd El-Hafiz, M.A.A Emam, W.A.H Oraby, S. Shaaban
    International Journal of Vehicle Structures and Systems, 2017
    This paper presents a theoretical model for simulation of driving torque distribution control to improve off-road vehicle mobility on split adhesion conditions. The model is constructed and then validated with experimental test rig results. A MATLAB simulink modeling of an electronically controlled device is used to modulate the applied force over multi-plate clutches located between the automotive driven axle shafts and the stationary hub. On driving over split adhesion roads, the control device brakes the spinning axle wheel running over ground low adhesion side and accordingly biases more torque to the other wheel with good adhesion side. This would improve the vehicle off-road mobility and save the power losses on low adhesion wheels. The proposed control model had been validated with experimental results obtained from an experimental tests conducted on a specially designed and built test rig. Consequently, the proposed control system has been embedded within a full car theoretical model to predict the vehicle performance on split adhesion drive conditions. The results showed that the constructed simulink model is suitable for simulating the proposed controlled device for torque distribution after matching the simulation results with experimental test rig results. Moreover, the proposed control model could be implemented to improve the transmitted traction power to the road from a conventional deferential.
  • Axle torque distribution control for enhancing mobility of off-road vehicles
    Alan G. Mayton, Christopher C. Jobes, Sean Gallagher
    International Journal of Heavy Vehicle Systems, 2014
    To further assess vibration exposure on haul trucks (HTs) and front-end wheel loaders (FELs), follow-up investigations were conducted at two US crushed stone operations. The purpose was to: 1) evaluate factors such as load/no-load conditions, speed, load capacity, vehicle age, and seat transmissibility relative to vibration exposure; 2) compare exposure levels with existing ISO/ANSI and EUGPG guidelines. Increasing HT speed increased recorded vibration at the chassis and seat as expected. Neither vehicle load nor vehicle speed increased transmissibility. Increasing HT size and age did show transmissibility decreasing. HT dominant-axis wRMS levels (most often the y-axis, lateral or side-to-side direction) were predominantly within the health guidance caution zone (HGCZ). However, several instances showed vibration dose value (VDV) above the exposure limit value (ELV) for the ISO/ANSI guidelines. VDV levels (all dominant x-axis or fore-aft) were within and above the HGCZ for the EUGPG and above the HGCZ for ISO/ANSI guidelines.

RECENT SCHOLAR PUBLICATIONS

  • Digital Measurement and Display of Tractor Longitudinal Wheel Slip Under Various Conditions
    M Gamal, HM El-Zomor, SM Shaaban, MM Abd-elhafiz
    Engineering Research Journal 183 (4), 70-84 , 2024
    2024
  • Control Strategy of Diesel Engine Hybrid Starter System
    MA Abouzaid, ME Bahgat, M Watany, MM Abd Elhafiz
    Automotive Technical Papers 346547 , 2023
    2023
  • Tire-Soil Interaction Simulation Using Finite Element Method to Investigate Their Deformation and Sinkage
    M Adel Mohamed, S Elhussieny, MA Emam, MM Abd Elhafiz
    Automotive Technical Papers 346547 , 2023
    2023
    Citations: 2
  • Influence of Electric Assistance Steering System on Vehicle Body Rolling Stability
    N A Mohamed, M M Abdel-Hafiz, HHD Hassan H Dadoura
    Engineering Research Journal (Shoubra) 49 (1), 80-97 , 2021
    2021
  • Fault Diagnosis in Wind Turbine Planetary Gearbox Using Vibration Time-Frequency Analysis Technique
    Ahmed S. Abdallah, Shawki A. Abouel-Seoud, Mohamed N. Mansy, Mohamed M ...
    American Journal of Engineering Research (AJER) 10 (2), 16-30 , 2021
    2021
  • Theoretical investigation of spokes geometry of non-pneumatic tires for off-road vehicles
    A Aboulyazid, M Watany, MM Abd Elhafiz
    SAE WCX Digital Summit , 2021
    2021
    Citations: 9
  • Dual Starting System Modeling of Vehicle Engine
    MA Abouzaid, ME Bahgat, M Watany, MM Abd Elhafiz
    SAE International Journal of Commercial Vehicles 15 (02-14-04-0030), 3-13 , 2021
    2021
    Citations: 1
  • Effect of Carbon Nanotubes on Characteristics Performance of Non-Pneumatic Tyres
    AM Aboul-Yazid, M Watany, MM Abd Elhafiz
    IOSR Journal of Engineering (IOSRJEN) 10 (9), 20-29 , 2020
    2020
    Citations: 1
  • Implementation of Proportional-Integral-Plus Controller in Vehicle Active Suspension System
    MMAE Hassan Metered, Abdelfattah Abdelhamid
    American Journal of Mechanical Engineering and Automation 6 (1), 1-8 , 2019
    2019
  • Modeling of a Hybrid Vehicle Engine Starting System
    MA Abouzaid, ME Bahgat, M Watany, MM Abd Elhafiz
    Engineering Research Journal 164 , 2019
    2019
    Citations: 1
  • Optimal lumped parameters estimation of vehicle passive suspension system using genetic algorithm
    HM H. El-taweel, Mohamed M. Abd elhafiz
    Journal of Advances in Vehicle Engineering 5 (1-4) , 2018
    2018
    Citations: 5
  • Improvement of In-Wheel Motorized Electric Vehicle Stability Through Yaw Motion Control
    NH Ahmed S. Abd El Monem, Mohammed Abd Elhafiz, Esam Morsy
    American Journal of Mechanical Engineering and Automation 5 (3), 90-98 , 2018
    2018
    Citations: 5
  • Performance Evaluation of Magnetorheological Limited Slip Differential for Automotive Applications
    H Mohamed M. Abd elhafiz, Metered
    SAE Technical Paper , 2018
    2018
    Citations: 7
  • Vibration Control of Active Vehicle Suspension System Using Optimized Fuzzy-PID
    HM H. El-taweel, Mohamed M. Abd elhafiz
    SAE Technical Paper , 2018
    2018
    Citations: 8
  • Lateral Stability Control of In-Wheel Motorized Electric Vehicle Based on Yaw Motion Control
    AS Abd El Monem, MM Abd Elhafiz, EM Allam, NM Hammad
    Engineering Research Journal 154, 1-13 , 2017
    2017
  • Modeling and Simulation of Off-Road Vehicle Mobility with Driving Torque Distribution Control on Split Adhesion Conditions
    MM Abd El-Hafiz, MAA Emama, WAH Oraby, S Shaaban
    International Journal of Vehicle Structures & Systems 9 (2), 95 , 2017
    2017
  • Lateral Stability Control of In‐Wheel Motorized Electric Vehicle Based on Yaw Motion Control
    EMANMH A. S. Abd El Monem, Mohamed. M. Abd Elhafiz
    Engineering Research Journal 154, 1-13 , 2017
    2017
  • Evaluation of Driveability Performance for an in-Use Microbus Equipped with Diesel/CNG Engines
    MMA Eid Saber Mohamed, Shawki Abdelhady Abouel-seoud, Nagwa Ahmed Abdel-halim
    American Journal of Engineering, Technology and Society 4 (5), 44-56 , 2017
    2017
  • Stress and Strain Analysis for a Ladder Truck Chassis
    MMMA Nagwa A. Abdel‐halim
    American Journal of Engineering, Technology and Society 2 (6), 131‐139 , 2015
    2015
    Citations: 1
  • RETRACTED ARTICLE Axle torque distribution control for enhancing mobility of off-road vehicles
    MMA El-Hafiz, MAA Emam, WAH Oraby, S Shaaban
    International Journal of Heavy Vehicle Systems 21 (3), 208-220 , 2014
    2014
    Citations: 2

MOST CITED SCHOLAR PUBLICATIONS

  • Theoretical investigation of spokes geometry of non-pneumatic tires for off-road vehicles
    A Aboulyazid, M Watany, MM Abd Elhafiz
    SAE WCX Digital Summit , 2021
    2021
    Citations: 9
  • Vibration Control of Active Vehicle Suspension System Using Optimized Fuzzy-PID
    HM H. El-taweel, Mohamed M. Abd elhafiz
    SAE Technical Paper , 2018
    2018
    Citations: 8
  • Performance Evaluation of Magnetorheological Limited Slip Differential for Automotive Applications
    H Mohamed M. Abd elhafiz, Metered
    SAE Technical Paper , 2018
    2018
    Citations: 7
  • Optimal lumped parameters estimation of vehicle passive suspension system using genetic algorithm
    HM H. El-taweel, Mohamed M. Abd elhafiz
    Journal of Advances in Vehicle Engineering 5 (1-4) , 2018
    2018
    Citations: 5
  • Improvement of In-Wheel Motorized Electric Vehicle Stability Through Yaw Motion Control
    NH Ahmed S. Abd El Monem, Mohammed Abd Elhafiz, Esam Morsy
    American Journal of Mechanical Engineering and Automation 5 (3), 90-98 , 2018
    2018
    Citations: 5
  • Tire-Soil Interaction Simulation Using Finite Element Method to Investigate Their Deformation and Sinkage
    M Adel Mohamed, S Elhussieny, MA Emam, MM Abd Elhafiz
    Automotive Technical Papers 346547 , 2023
    2023
    Citations: 2
  • RETRACTED ARTICLE Axle torque distribution control for enhancing mobility of off-road vehicles
    MMA El-Hafiz, MAA Emam, WAH Oraby, S Shaaban
    International Journal of Heavy Vehicle Systems 21 (3), 208-220 , 2014
    2014
    Citations: 2
  • Dual Starting System Modeling of Vehicle Engine
    MA Abouzaid, ME Bahgat, M Watany, MM Abd Elhafiz
    SAE International Journal of Commercial Vehicles 15 (02-14-04-0030), 3-13 , 2021
    2021
    Citations: 1
  • Effect of Carbon Nanotubes on Characteristics Performance of Non-Pneumatic Tyres
    AM Aboul-Yazid, M Watany, MM Abd Elhafiz
    IOSR Journal of Engineering (IOSRJEN) 10 (9), 20-29 , 2020
    2020
    Citations: 1
  • Modeling of a Hybrid Vehicle Engine Starting System
    MA Abouzaid, ME Bahgat, M Watany, MM Abd Elhafiz
    Engineering Research Journal 164 , 2019
    2019
    Citations: 1
  • Stress and Strain Analysis for a Ladder Truck Chassis
    MMMA Nagwa A. Abdel‐halim
    American Journal of Engineering, Technology and Society 2 (6), 131‐139 , 2015
    2015
    Citations: 1
  • Digital Measurement and Display of Tractor Longitudinal Wheel Slip Under Various Conditions
    M Gamal, HM El-Zomor, SM Shaaban, MM Abd-elhafiz
    Engineering Research Journal 183 (4), 70-84 , 2024
    2024
  • Control Strategy of Diesel Engine Hybrid Starter System
    MA Abouzaid, ME Bahgat, M Watany, MM Abd Elhafiz
    Automotive Technical Papers 346547 , 2023
    2023
  • Influence of Electric Assistance Steering System on Vehicle Body Rolling Stability
    N A Mohamed, M M Abdel-Hafiz, HHD Hassan H Dadoura
    Engineering Research Journal (Shoubra) 49 (1), 80-97 , 2021
    2021
  • Fault Diagnosis in Wind Turbine Planetary Gearbox Using Vibration Time-Frequency Analysis Technique
    Ahmed S. Abdallah, Shawki A. Abouel-Seoud, Mohamed N. Mansy, Mohamed M ...
    American Journal of Engineering Research (AJER) 10 (2), 16-30 , 2021
    2021
  • Implementation of Proportional-Integral-Plus Controller in Vehicle Active Suspension System
    MMAE Hassan Metered, Abdelfattah Abdelhamid
    American Journal of Mechanical Engineering and Automation 6 (1), 1-8 , 2019
    2019
  • Lateral Stability Control of In-Wheel Motorized Electric Vehicle Based on Yaw Motion Control
    AS Abd El Monem, MM Abd Elhafiz, EM Allam, NM Hammad
    Engineering Research Journal 154, 1-13 , 2017
    2017
  • Modeling and Simulation of Off-Road Vehicle Mobility with Driving Torque Distribution Control on Split Adhesion Conditions
    MM Abd El-Hafiz, MAA Emama, WAH Oraby, S Shaaban
    International Journal of Vehicle Structures & Systems 9 (2), 95 , 2017
    2017
  • Lateral Stability Control of In‐Wheel Motorized Electric Vehicle Based on Yaw Motion Control
    EMANMH A. S. Abd El Monem, Mohamed. M. Abd Elhafiz
    Engineering Research Journal 154, 1-13 , 2017
    2017
  • Evaluation of Driveability Performance for an in-Use Microbus Equipped with Diesel/CNG Engines
    MMA Eid Saber Mohamed, Shawki Abdelhady Abouel-seoud, Nagwa Ahmed Abdel-halim
    American Journal of Engineering, Technology and Society 4 (5), 44-56 , 2017
    2017