Papers by Prof.Fathi Hareb
Computer Methods in Biomechanics and Biomedical Engineering, 2009
Knowledge of muscular forces can contribute to assist in diagnoses and in treatments of persons s... more Knowledge of muscular forces can contribute to assist in diagnoses and in treatments of persons suffering from locomotion disorders. We tackled the issue of muscular forces determination with the objective of its implementation in pathological disturbed movements' studies, in particular in those about the walk of children suffering from cerebral palsy. We handled mainly with the question of the sensitivity of these calculations to geometrical changes in the musculoskeletal model. The dynamic model which we implemented was validated by comparing its results with the EMG signals on the one hand, and with literature data related to healthy subjects muscular forces, on the other hand. The sensibility of this model was then estimated with respect to (i) a modification of the femoral antetorsion and (ii) the modeling or not of the transfer of the muscle rectus femoris in postoperative conditions.
Micromotors.servo Technique, 2001
In this paper,the Slice-Tube Method(STM),is applied to calculate the air gap permeance for the Si... more In this paper,the Slice-Tube Method(STM),is applied to calculate the air gap permeance for the Single Phase Switched Reluctance Motor(SPSRM) with rotor at arbitrary position.The calculating results are compared with finite element method,which indicates that the STM is practically suitable for engineering purposes.
Micromotors.servo Technique, 2001
In this paper,the Slice-Tube Method(STM),is applied to calculate the air gap permeance for the Si... more In this paper,the Slice-Tube Method(STM),is applied to calculate the air gap permeance for the Single Phase Switched Reluctance Motor(SPSRM) with rotor at arbitrary position.The calculating results are compared with finite element method,which indicates that the STM is practically suitable for engineering purposes.
In this paper, Design Microstrip antenna integrated with solar cell which used for transmitted an... more In this paper, Design Microstrip antenna integrated with solar cell which used for transmitted and received the RF signal and generate DC voltage at same time, The antenna was printed using Perpex substrate material with dielectric constant of εr = 2.6 and thickness of h = 1.6 mm as insulation layer and use solar cell as substrate layer with εr = 3.9 and thickness 2.3 mm. The overall dimension of the antenna is 85 mm x 55 mm x 3.9 mm with 50 Ω impedance. This antenna operates between 4.9106 GHz and 5.1219 GHz for return loss of less than -10 dB. The simulation results present that the antenna gain ranges between 3.479 dBi and dBi with Directivity ranges between 4.833 and 6.574.
Transmission line insulators in service are subjected to atmospheric pollution, which under certa... more Transmission line insulators in service are subjected to atmospheric pollution, which under certain conditions can seriously reduce the flash over voltage . thus affecting the continuity of power supply . This paper focus on the measurement of equivalent salt deposit density in the field to re evaluate the dimensions and insulators type should be used in different location according the pollution level .
The hazardous of electric shock, comes from the miss use of electrical devices on the daily bases... more The hazardous of electric shock, comes from the miss use of electrical devices on the daily bases use like contact with bare wires for example, but electromagnetic field EMF produced in the space around electrical device as a result of current flow to operate the device in use is an invisible. The EMF danger for the common people, has effects on the surrounding environment and society as well. The modern life style rely mainly on the electricity because of the need of using facilities and accessories operated by electricity. And as a result the need to be aware of the potential health effects of electricity become a must. The communication revolution of the last two decades resulted in several research studies to shade light on the EMF hazard, which is known as a radio frequencies or non ionization pollution. This paper introduce the reader to the literature resources in the field EMF effects and hazardous as well as the description of several unusual aspects of challenging in this area. In addition the paper presents the possible health effects, and EMF hazardous concerns which may happen due to the miss use of the electrical devices such as, Mobile phone, base station, transmitters, and power transmission line. The exposure occurs due to the accumulated doses of EMF.
Lightning Phenomenon is a transient, high current discharge, due to the accumulation of charges i... more Lightning Phenomenon is a transient, high current discharge, due to the accumulation of charges in clouds. This paper discusses the nature and causes of the phenomenon of lightning and Principle of lightning.
The most application of communication, need antenna with changeable direction of radiation with h... more The most application of communication, need antenna with changeable direction of radiation with high gain, also without mechanical motion (moving-less), with a higher electric signal reliability. The changeable radiation increase the reliability to communicate at different destination .
In first stage of each microwave receiver there is Low Noise Amplifier (LNA) circuit, and this st... more In first stage of each microwave receiver there is Low Noise Amplifier (LNA) circuit, and this stage has important rule in minimizing the system noise figure, provide enough gain with sufficient linearity, and assure a stable 50 Ω input impedance at a low power consumption. The design of a LNA in Microwave (MW) circuit requires the trade-off many importance characteristics such as gain, Noise Figure (NF), stability, power consumption and complexity. This situation forces the designers to make choices in the design of MW circuits. This paper presents a single stage 5.8 GHz LNA design using single-stub microstrip lines with minimum lengths using Agilent ATF-54143 Low Noise Enhancement Mode Pseudomorphic HEMT. The amplifier is manually designed using conventional techniques, Smith chart was used to do a matching of the input and output of the amplifier. A completed design of the amplifier was optimized using Agilent Technologies Advanced Design System (ADS 2011.01) software. The proposed LNA has successfully designed with 11.11 dB forward gain and 1.14 dB noise figure and working stably in the desired frequency.
The discrete-time closed-loop PID controller is the most popular controller. It is more faster ti... more The discrete-time closed-loop PID controller is the most popular controller. It is more faster time response and rise time than the continuous-time PID controller. Although, we have to check the stability in a continuous-time of any digital controller, but after using z-transform to convert the system to a digital control system we use the digital signals as an input to the computer. And treat those signals inside the microprocessor by the A.T.U. after that convert them to analog to the final element.
Now, many systems are time-varying, in industrial processes. According to PID parameters adjustme... more Now, many systems are time-varying, in industrial processes. According to PID parameters adjustment problems of these systems, the paper adopts the parameters of PID controller and introduces, Ziegler-Nichols PID's (ZNPID's) tuning rule was proposed. The closed-loop test system is implemented. And simulates the output behavior of controller effectively, and enhances the flexibility of design and test. The results show that improves the PID parameters. The best choice of tuning parameters depends upon a variety of factors including the dynamic behavior of the controlled process, the controller's objectives, and the operator's understanding of the tuning procedures. MATLAB software packages is used to simulate PID controller..
The paper presents a Novel single-phase switched reluctance motor (SPSRM) with multi air gap step... more The paper presents a Novel single-phase switched reluctance motor (SPSRM) with multi air gap steps, in the rotor poles, and parking magnet poles arranged on the stator.
Abstract
The paper present a new type of the single-phase switched reluctance motor SPSRM, it has... more Abstract
The paper present a new type of the single-phase switched reluctance motor SPSRM, it has three
air gap steps arranged on the rotor poles, two wounded poles and parking magnet poles are
arranged on the stator.
The paper focuses on Air gap Pemeance Modeling, first one the Air gap Normalizing Permeance
Tubes ANP, this method is based to simplify the calculation of the magnetic circuit of SPSRM.
Second method is Novel Slice Tube Method TSM. Both methods used to calculate the motor
inductance, then the obtained results compared with two dimensions Finite Element Analysis FEA
package developed for SPSRM.
The obtained results show that both methods are acceptable for engineering design.
In first stage of each microwave receiver there is Low Noise Amplifier (LNA) circuit, and this st... more In first stage of each microwave receiver there is Low Noise Amplifier (LNA) circuit, and this stage has important rule in minimizing the system noise figure, provide enough gain with sufficient linearity, and assure a stable 50 Ω input impedance at a low power consumption. The design of a LNA in Radio Frequency/Microwave (RF/MW) circuit requires the trade-off many importance characteristics such as gain, Noise Figure (NF), stability, power consumption and complexity. This situation Forces the designers to make choices in the design of RF circuits.
In this paper the aim is to design and simulate a LNA circuit with high gain and low noise using E-pHEMT MGA-665P8 transistor for frequency of 4 GHz. The amplifier is manually designed using conventional technique, Smith chart was used to do a matching of the input and output of the amplifier. The matching network was designed with microstrip lines and it’s single-stub with minimum lengths. A completed design of amplifier was optimized using Hewlett-Packard Advanced Design System (HP-ADS) software. A single stage LNA has successfully designed with 21.032 dB forward gain and 0.697 dB noise figure and working stably in the desired frequency.
The paper presents the Aspects Design of the Single-
Phase Switched Reluctance Motor SPSRM, has a... more The paper presents the Aspects Design of the Single-
Phase Switched Reluctance Motor SPSRM, has a multi
air gap step rotor pole, two wounded poles and parking
magnet poles are arranged on the stator.
The paper focuses on the Permeance Tubes. A suitable
geometrical stepped gap rotor pole leads to increase the
inductance variation angle. The asymmetrical rotor help
to insure the rotor will park in its parking position.
The SPSRM shows that it has simple magnetic circuit,
low assembly cost, variable speed, and the air gap steps
and parking magnet gives it capability of self-starting.
This paper, presents and discusses the single phase Doubly Salient Permanent Magnet (DSPM) motor.... more This paper, presents and discusses the single phase Doubly Salient Permanent Magnet (DSPM) motor. The motor has four stator poles and six rotor poles, two different air-gap lengths are arranged in the stator poles to insure self-start. The rotor parking position is in the effective torque zone of the winding. The motor has a simple and robust structure. The simulation and experimental results show that the motor can achieve a higher efficiency over a large speed range. The detailed operation principle, modeling and finite element analysis of the motor are investigated in this paper. Experimental results for prototype machine are presented.
The mismanagement of the educational Institutions and the un stability of the curriculum lead to ... more The mismanagement of the educational Institutions and the un stability of the curriculum lead to the failure of these Institutions outcome.
The teachers suffers from knowledge’s and teaching skills weakness and unadequacy methodology delivering the teaching materials to the students.
This paper deals with all these requirements of the education process to achieve its goals.
The economic developments in country like Libya, is an urgent need or in demand fore foreign inve... more The economic developments in country like Libya, is an urgent need or in demand fore foreign investment to raise and improve the standard life level, growth. The increment development will improve the promotion of the infrastructure of the country, and pushup the economic level of each person. As long as the foreign investment not leads to drawback (disorder) an extirpation of our social tradition and nobility. This paper present the chine's experience in solving the impeded of foreign investment. The cause of impeded (delayed) of foreign investment in Libya, due to the absence of the administrations stabilities, regulations policies, and instability on the decree-law. The paper shows the way and methods of treating these factors to approach to the effective level of foreign investment. And present the Chinese experience wherein can use it as a guidance of trial to speedup the imported foreign investment.
Drafts by Prof.Fathi Hareb
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Papers by Prof.Fathi Hareb
The paper present a new type of the single-phase switched reluctance motor SPSRM, it has three
air gap steps arranged on the rotor poles, two wounded poles and parking magnet poles are
arranged on the stator.
The paper focuses on Air gap Pemeance Modeling, first one the Air gap Normalizing Permeance
Tubes ANP, this method is based to simplify the calculation of the magnetic circuit of SPSRM.
Second method is Novel Slice Tube Method TSM. Both methods used to calculate the motor
inductance, then the obtained results compared with two dimensions Finite Element Analysis FEA
package developed for SPSRM.
The obtained results show that both methods are acceptable for engineering design.
In this paper the aim is to design and simulate a LNA circuit with high gain and low noise using E-pHEMT MGA-665P8 transistor for frequency of 4 GHz. The amplifier is manually designed using conventional technique, Smith chart was used to do a matching of the input and output of the amplifier. The matching network was designed with microstrip lines and it’s single-stub with minimum lengths. A completed design of amplifier was optimized using Hewlett-Packard Advanced Design System (HP-ADS) software. A single stage LNA has successfully designed with 21.032 dB forward gain and 0.697 dB noise figure and working stably in the desired frequency.
Phase Switched Reluctance Motor SPSRM, has a multi
air gap step rotor pole, two wounded poles and parking
magnet poles are arranged on the stator.
The paper focuses on the Permeance Tubes. A suitable
geometrical stepped gap rotor pole leads to increase the
inductance variation angle. The asymmetrical rotor help
to insure the rotor will park in its parking position.
The SPSRM shows that it has simple magnetic circuit,
low assembly cost, variable speed, and the air gap steps
and parking magnet gives it capability of self-starting.
The teachers suffers from knowledge’s and teaching skills weakness and unadequacy methodology delivering the teaching materials to the students.
This paper deals with all these requirements of the education process to achieve its goals.
Drafts by Prof.Fathi Hareb
The paper present a new type of the single-phase switched reluctance motor SPSRM, it has three
air gap steps arranged on the rotor poles, two wounded poles and parking magnet poles are
arranged on the stator.
The paper focuses on Air gap Pemeance Modeling, first one the Air gap Normalizing Permeance
Tubes ANP, this method is based to simplify the calculation of the magnetic circuit of SPSRM.
Second method is Novel Slice Tube Method TSM. Both methods used to calculate the motor
inductance, then the obtained results compared with two dimensions Finite Element Analysis FEA
package developed for SPSRM.
The obtained results show that both methods are acceptable for engineering design.
In this paper the aim is to design and simulate a LNA circuit with high gain and low noise using E-pHEMT MGA-665P8 transistor for frequency of 4 GHz. The amplifier is manually designed using conventional technique, Smith chart was used to do a matching of the input and output of the amplifier. The matching network was designed with microstrip lines and it’s single-stub with minimum lengths. A completed design of amplifier was optimized using Hewlett-Packard Advanced Design System (HP-ADS) software. A single stage LNA has successfully designed with 21.032 dB forward gain and 0.697 dB noise figure and working stably in the desired frequency.
Phase Switched Reluctance Motor SPSRM, has a multi
air gap step rotor pole, two wounded poles and parking
magnet poles are arranged on the stator.
The paper focuses on the Permeance Tubes. A suitable
geometrical stepped gap rotor pole leads to increase the
inductance variation angle. The asymmetrical rotor help
to insure the rotor will park in its parking position.
The SPSRM shows that it has simple magnetic circuit,
low assembly cost, variable speed, and the air gap steps
and parking magnet gives it capability of self-starting.
The teachers suffers from knowledge’s and teaching skills weakness and unadequacy methodology delivering the teaching materials to the students.
This paper deals with all these requirements of the education process to achieve its goals.