Ahmed Sameh

Mansoura University

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i-10 index

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Mohamed Fanni

Egypt-Japan University of Science and Technology

Abdelfatah M. Mohamed

Egypt-Japan University of Science and Technology

Omuzi A. Hudson

Egypt-Japan University of Science and Technology

Sabah M. Ahmed

Taif University

Osama Askar

Mansoura University

Asmaa N. Elboraey

National Research Centre

Maha Salman

Egypt-Japan University of Science and Technology

Leila Perea-Lowery

University of Turku

Pekka K. Vallittu

University of Turku

Salah Hegazy

Mansoura University

Cooperative Institutions

Mansoura University

Egypt-Japan University of Science and Technology

University of Turku

Faculty of 1000 (United States)

National Research Centre

Turku University Hospital

Turku City Hospital

Turku Centre for Biotechnology

Varsinais-Suomen Sairaanhoitopiiri

University of Dental Medicine

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A finite element analysis study on different angle correction designs for inclined implants in All-On-Four protocol

BMC Oral Health (2024)

Christine Raouf Micheal Ibrahim Ahmed Sameh Osama Askar

The aim of this study is to investigate, through finite element analysis (FEA), the biomechanical behavior of the built-in angle corrected dental implant versus implant with angled multiunit abutment used in All-On-Four treatment protocol.

Abutment

Fixture

Mandible (arthropod mouthpart)

10.1186/s12903-024-04091-2

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Citations (2)

Autonomous Flight Take-off in Flapping Wing Aerial Vehicles

Journal of Intelligent & Robotic Systems (2019)

Omuzi A. Hudson Mohamed Fanni Sabah M. Ahmed Ahmed Sameh

Flapping

Flight Dynamics

Camber (aerodynamics)

10.1007/s10846-019-01003-3

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Citations (11)

New 3D Translational Interconnected Manipulator for Industrial Applications

2022 IEEE International Conference on Mechatronics and Automation (ICMA) (2018)

Ahmed Sameh Mohamed Fanni Abdelfatah M. Mohamed

A new interconnected manipulator whose end-effector can carry out 3 translational motions in the 3D space with constant orientation is presented in this paper. It is the only interconnected manipulator in the world that produces such motion, which is needed for many industrial applications, using solely rotary actuators and joints. Practically, rotary actuators and joints are preferable than linear actuators and joints because of their cheaper cost, smaller installation size and better reliability. The unconventional interconnected structure of the proposed manipulator enables it to possess, to some extent, the combined advantages of serial and parallel manipulators such as light weight, high speed, rigidity and accuracy as well as large workspace to size ratio. The mechanism description, mobility analysis, kinematic analysis and workspace analysis are presented in details. Finally, an accurate simulation using MSC.ADAMS ^© software is carried out to demonstrate the feasibility of the proposed manipulator's design.

Work space

Rigidity (electromagnetism)

Linear actuator

Structural rigidity

10.1109/icma.2018.8484331

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Citations (4)

Effect of specific retention biomaterials for ball attachment on the biomechanical response of single implant-supported overdenture: A finite element analysis

Journal of the mechanical behavior of biomedical materials/Journal of mechanical behavior of biomedical materials (2021)

Mona Gibreel Ahmed Sameh Salah Hegazy Timo Närhi Pekka K. Vallittu

Abutment

Acrylic resin

10.1016/j.jmbbm.2021.104653

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Citations (7)

Dimensional accuracy of implant impression obtained from polysiloxane condensation silicone

Deleted Journal (2015)

Wessam M. Dehis Asmaa N. Elboraey Ahmed Sameh

Objective The aim of the study was to evaluate the dimensional accuracy of implant impressions obtained from different forms of polysiloxane condensation silicon impression materials. One of the major concerns in implant-retained prostheses is the accuracy of impressions. This plays an essential role in prosthesis implant adaptation. Materials and methods Two conventional dental implants were drilled into the interforamina area of a complete edentulous lower stone cast. Impressions were taken 10 times with each of the two impression materials. Each cast was measured three times, and the distances from the reference point at the center of the superior surface of implants were compared with the control model. Results All stone casts obtained with the two techniques had significantly larger dimensions when compared with the original chromium cobalt model, on the basis of the t-test (t>1.96), with percentage of change 13.77 for the casts obtained with the putty/light impression and 13.55 for stone casts obtained with medium impression material. There was insignificant difference between stone casts obtained from putty/light and medium consistency rubber-based impression material as (P>0.05). Conclusion The types of impression materials affect the dimensional accuracy of the resultant casts.

Impression

Putty

10.1097/01.mjx.0000465790.52221.36

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Citations (1)

Design, control, and dynamic simulation of securing and transformation mechanisms for a hybrid ground aerial robot

International journal of mechanical & mechanics engineering (2020)

Maha Salman Ahmed Sameh Mohamed Fanni Shigeki Sugano Abdelfatah M. Mohamed

Source

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Citations (1)

Bio-inspired jumping maneuver for launching flapping wing micro air vehicles

Omuzi A. Hudson Mohamed Fanni Sabah M. Ahmed Ahmed Sameh Mohamed Fanni

This paper presents the design and simulation of a jumping mechanism as a means of flight initiation in Flapping Wing Micro Air Vehicles (FWMAV) inspired by birds. Most flying birds take off for flight from standing or perching position at low air speed. A lightweight 4-bar leg mechanism has been designed using dimensional synthesis by motion generation. Graphical and analytical methods are established to determine the kinematic dimensions that fulfill some prescribed take-off maneuvers. Link cross sections have been optimized to reduce weight. The jumping leg has been tested with an efficient aerodynamic model that accurately predicts unsteady flapping wing aerodynamic characteristics just after launching. Transition of forces from leg to wings has been analyzed. For a jumping angle of about 50 degrees at 10m/s the 33.3 g ornithopter model gains momentum and reaches steady state flight at a velocity close to the initial value.

Flapping

Position (finance)

Aerodynamic force

Micro air vehicle

10.1109/icarsc.2018.8374168

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Citations (7)

New Methodology for Achieving Trim Condition for a small Flapping Wing Air Vehicle

Bulletin of the Faculty of Engineering Mansoura University (2020)

Mohammed Fanni Maha A. El-Gayyar Ahmed Sameh

When dealing with a conventional aircraft, the design must be based on simplification assumptions, such as a cruising flight or a trimmed flight condition, which requires aircraft to have forces and moments equilibrium with respect to the center of gravity without any continuous control efforts.However, in case of ornithopters, there is no such equilibrium point due to the continuous flapping wing motion during the cruising flight.Therefore, this paper introduces a new methodology to obtain trimmed flight condition for a small flapping wing air vehicle.This methodology is based on applying initial impulsive forces to the air vehicle in such a way that the flapping wing air vehicle reaches almost constant flight speed after removing the initial impulsive forces.This enables the designer to examine the design parameters of the vehicle during realistic flight performance.A refined aerodynamic model programmed with MATLAB ® is integrated into a flapping vehicle model using efficient multi body dynamics software MSC.ADAMS ® to test the system.The results show perfect trimmed flight condition for a flapping wing air vehicle that never presented before in the literature.

Trim

Flapping

Micro air vehicle

10.21608/bfemu.2020.100784

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Citations (0)

Development of a Balanced 3D Translational Interconnected Manipulator With Solely Rotary Joints/Actuators and Free-Internal-Singularity Workspace

IEEE Access (2021)

Ahmed Sameh Mohamed Fanni Victor Parque Abdelfatah M. Mohamed

A new interconnected translational manipulator is proposed. It is the only interconnected manipulator that makes such motion using revolute joints and three rotary actuators. Rotary joints and actuators are favored practically than their linear counterparts due to their lower price, lower size of installation and higher reliability. The configuration of the proposed manipulator allows it to maintain, to a large extent, the combined merits of serial and parallel manipulators. In contrast to all other existing interconnected manipulators, the proposed manipulator has free-internal-singularity workspace. Using a practical proposed methodology, a balancing system is developed that reduces dramatically the power consumption and facilitates using small-sized-motors. The mobility analysis is carried out using a newly developed methodology suitable for interconnected manipulators. Closed forms for position and velocity kinematics as well as for maximum cuboid workspace are derived. The developed mechanical design is validated by finite element analysis. The controller performance is tested using ADAMS®& MATLAB®/Simulink co-simulation. The results indicate the feasibility of the proposed manipulator and its advantages over existing translational manipulators from engineering as well as economic viewpoints.

Revolute joint

Work space

Mobile manipulator

Serial manipulator

10.1109/access.2021.3136779

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Citations (1)