MOHAMED RAZI Morakchi
مراكشي محمد رازي
razi.morakchi@univ-msila.dz
0696695193
- DEPARTEMENT OF: ELECTRICAL ENGINEERING
- Faculty of Technology
- Grade PHd
About Me
master's degree. in university of batna 2
DomainScience et Technologies
Research Domains
electromechanics Internet of things sensors accelerometers
FiliereElectromécanique
Location
Msila, Msila
Msila, ALGERIA
- 07-07-2017
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master's degree
evaluation des paramétres de performances d'un systeme instrumenté de sécurité - 01-01-2015
- 1992-06-28 00:00:00
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MOHAMED RAZI Morakchi birthday
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- 2023
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2023
The suitable accelerometer parameter for minimizing uncertainty
Due to their benefits, accelerometers are now widely used in a variety of fields. As a result, various accelerometer types are introduced in this paper, along with their applications in engineering issues. The capacitive accelerometers are then compared to other types, and a mathematical model for them is presented. Furthermore, the effect of damping rate selection on measurement error and accelerometer performance is investigated. Finally, compare the previous damping rate value to the proposed appropriate choice of value to reduce measurement error to less than 0.02 percent 0,11%.
Citation
Mohamed Razi morakchi , SAIDA Dahmane , atef chibani, ,(2023), The suitable accelerometer parameter for minimizing uncertainty,3rd International Conference on Engineering and Applied Natural Sciences,Konya,Turkey
- 2023
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2023
Application of phase change material foam composites in metal hydride with recovery heat: heat and mass transfer
The goal of this research is to construct a two-dimensional geometric structure and simulate a hydrogen discharge tank from a lanthanum hydride reactor (LaNi5-H6). This is to demonstrate the feasibility of a system for studying the behavior of lanthanum hydride by tracking the evolution of the material and mass transfer of hydrogen as the porosity value of foam materials changes from 0.10 to 0.80, comparing it to pure paraffin, and closely monitoring the solidification process. The findings revealed the significance of several characteristics, particularly conductive conductivity and content. Material with a thermal phase transition because the pressure remains constant during the reactor's discharge process and the characteristics of the high-density materials, the computational analysis is done on the various operational parameters. Aside from demonstrating thermal coupling between the MH layer and the middle of the centrifugal tubes, the computational results show a significant increase in the thermal efficiency of the metallic hydride dehydrogenation tank, particularly with the thermal reactor whose medium porosity is to change the cylindrical phase, which showed a 60% reduction in the primary r discharge time. Pure paraffin, on the other hand, requires a considerable time of hardening during the phase transition.
Citation
Mohamed Razi morakchi , atef chibani, aissa dehane, slimane merouani, ,(2023), Application of phase change material foam composites in metal hydride with recovery heat: heat and mass transfer,2nd International Conference on Innovative Academic Studies on 28 - 31 January in 2023,Turkey _ Konya
- 2023
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2023
Heat transfer enhancement for the melting and solidification process of phase change materials-metal foam systems
The current study develops a two-dimensional mathematical model to investigate the thermal efficiency of a PCM-metal foam (MF) based composite cylindrical energy storage unit with constant and transient heat loads, while allowing for geometric change and vacancy in PCM. The separation of variables technique was used to solve the transfer equation, and the contact area was estimated using the Stefan condition and heat transfer equation. The materials used in PCM and MF are paraffin and steel, graphite,copper, respectively. By injecting metallic foam with a porous structure, melt time was lowered by 30-55 %, respectively. The casing with four inner tubes has the fastest melting process with all pore sizes of metallic foam. When it comes to pure PCM solidification, the case with four tubes provides a faster solidification period. Furthermore, among composite materials of phase transition, the instance with three tubes had the highest solidification rate. As a result, inserting metallic foam is more efficient in the solidification process than in the melting phase. Moreover, the number of inner tubes has a greater effect on phase change rates in metal foam/PCM composites than in pure PCM
Citation
Mohamed Razi morakchi , ,(2023), Heat transfer enhancement for the melting and solidification process of phase change materials-metal foam systems,2nd International Conference on Innovative Academic Studies on 28 - 31 January in 2023,Turkey _ Konya
- 2023
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2023
Heat transfer enhancement for the melting and solidification process of phase change materials-metal foam systems
discharge tank from a lanthanum hydride reactor (LaNi5-H6). This is to demonstrate the feasibility of a system for studying the behavior of lanthanum hydride by tracking the evolution of the material and mass transfer of hydrogen as the porosity value of foam materials changes from 0.10 to 0.80, comparing it to pure paraffin, and closely monitoring the solidification process. The findings revealed the significance of several characteristics, particularly conductive conductivity, and content. Material with a thermal phase transition because the pressure remains constant during the reactor's discharge process and the characteristics of the high-density materials, the computational analysis is done on the various operational parameters. Aside from demonstrating thermal coupling between the MH layer and the middle of the centrifugal tubes, the computational results show a significant increase in the thermal efficiency of the metallic hydride dehydrogenation tank, particularly with the thermal reactor whose medium porosity is to change the cylindrical phase, which showed a 60% reduction in the primary r discharge time. Pure paraffin, on the other hand, requires a considerable time of hardening during the phase transition.
Citation
Mohamed Razi morakchi , atef chibani, dehane aissa, selman djeffal, slimane merouani, ,(2023), Heat transfer enhancement for the melting and solidification process of phase change materials-metal foam systems,National Seminar of Physics, Chemistry, and Their Applications Webinar (NSPCA'23),University Mohamed El Bachir El Ibrahimi of Bordj Bou Arreridj, Algeria. March 6 th -7 th 2023
- 2023
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2023
Heat transfer analysis during the solidification of RT82 paraffin in big-scale metal foam-based latent thermal storage unit
Metal foam (MF) and nano-sized particles (NSP) are regarded as patent tools for enhancing the thermal performance of phase change materials (PCM)-based latent thermal energy storage unit (LTES), but data on this issue for large-scale installations is very scarce. This study provides a comprehensive computational analysis of the effects of MF and NSP on the solidification process of RT82 paraffin (PCM matrix) in a large-scale shell and tube latent thermal energy storage unit (of heat exchanger form). The developed 2D transient model developed on Ansys Fluent 15.0 software was initially verified using available literature experimental data. The process performance was tested for 5% Al2O3 nanoparticles and various MFs [i.e. aluminum (Al), copper (Cu), nickel (Ni), and titanium (Ti)] with varied porosity (96–100%). The computed mean and spatial temperature and solidified degree of the PCM block showed a drastic acceleration of the solidification process with the b MF technique rather than with the nanoparticles system. The solidification performance increased in the direction of MF-thermal conductivity increase, i.e. Cu > Al > Ni > Ti, and material porosity decrease. These conditions allow rapid HTF heat recovery and then stocking considerable thermal energy. However, the MF porosity could not decrease below 95% to avoid a huge loss of material storage (PCM), thereby diminishing the thermal storage capacity of the LTES unit.
Citation
Mohamed Razi morakchi , atef chibani, slimane merouani, Noureddine Gherraf, Aissa Dehane, Ghania Mecheri, Cherif Bougriou, Djemaa Guerraiche, , (2023), Heat transfer analysis during the solidification of RT82 paraffin in big-scale metal foam-based latent thermal storage unit, Numerical Heat Transfer, Part B: Fundamentals, Vol:0, Issue:0, pages:1-23, Taylor & Francis
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- 2023
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2023
Optimized Computer Torque Control and Dynamic Model of a Spatial Single Section Continuum robot
In this paper, an Optimized Computer Torque Controller (OCTC) based on dynamic model for a variable continuum robot is elaborately developed. Basically, the OCTC is applied for the first time on continuum robots in this paper aiming at finding out the required robot’s cables tension as well as the robot’s orientation/bending angles during tracking any prescribed trajectory. Interestingly, particle swarm optimization (PSO) is used to optimize CTC’s parameters which enables the robot to perform tasks with high precision and stability, even in the presence of external perturbations or uncertainties. The proposed controller is evaluated by testing its ability to track multiple trajectories even in the presence of external perturbations. The results of these simulations show that the OCTC controller exhibits superior performance in terms of settling time, overshoot, and robustness against disturbances for the continuum robots. It is noteworthy to say that CTC is able to capture the behavior of the robot quite rapidly when the robot faces a disturbance which perfectly fits in with real-world applications of continuum robot.
Citation
Mohamed Razi morakchi , selman djeffal, ghoul abdelhamid, mahfoudi chawki, , (2023), Optimized Computer Torque Control and Dynamic Model of a Spatial Single Section Continuum robot, Results in Control and Optimization, Vol:12, Issue:4, pages:1-16, science direct
- 2023
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2023
Analysis and optimization of concentrator photovoltaic system using a phase change material (RT 35HC) combined with variable metal fins
One of the biggest challenges of modern technology is the production of clean energy from available resources such as wind, sun and sea. The solar panel is considered as a potent tool for the production of green electric energy from solar irradiation. However, the performance of photovoltaic (PV) systems is related to the effectiveness of the integrated cooling system. In the present paper, PCM (RT35HC) has been used as a cooling process, which is placed in the back container of the photovoltaic unit. To enhance the thermal performance of PCM, a set of fins of different materials (graphite, copper, steel and titanium) has been integrated into the cooling enclosure. Additionally, the performance of the solar panel has been investigated with the variation of the inclination angle (β = 0, 30, 45, 75, and 90°). Independently of the fins material type and the inclination angle (β) of the PV-system, the presence of fins has relatively enhanced the energetical efficiency of the solar panel, especially with the adoption of graphite and copper materials. With the use of graphite and copper, the mean temperature of the solar panel was reduced by 3 °C compared to the case of steel and titanium. The overall PV temperature was stabilized at around 40 °C. The outcomes of the present study are of great importance for future developments of photovoltaic (PV) systems.
Citation
Mohamed Razi morakchi , slimane merouani, atef chibani, houssem laidoudi, dehane aissa, , (2023), Analysis and optimization of concentrator photovoltaic system using a phase change material (RT 35HC) combined with variable metal fins, Journal of Energy Storage, Vol:72, Issue:4, pages:1-23, Elsevier
- 2022-08-31
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2022-08-31
A NOVEL TECHNIQUE BASED ON IoT ACCELEROMETER FOR TRANSMITTING CIRCULAR CHART RECORDERS TO ELECTRICAL DATA
The omnipresence of the Internet of Things (IoT)-based accelerometer in the industry has been considered as an alternative to paper chart recorder yet it is unprecedentedly tested on pressure recording variation. To this end, this paper contributes to the improvement of data acquisition which is obtained from pressure chart recorders through accelerometer devices. Firstly, the accelerometer device is thoroughly described. Then, the implementation of the accelerometer and IoT-based accelerometers in a variety of domains is discussed. Secondly, the used materials to carry out the bench test are presented, namely accelerometer, ADXL345, H3LIS331DL, Barton , DEWEIT pressure chart recorder, Raspberry pi and Arduino. The aforementioned devices are purposefully coupled, explicitly two types of accelerometers are plugged into the raspberry pi for the sake of comparing the accuracy of transmitting mechanical to electronic charts. Finally, it is found that the accelerometers combined with wireless communication can offer a reliable alternative for expensive tasks. In addition, it perfectly facilitates data acquisition from a pressure chart recorder which is considered the first integration of an accelerometer in a pressure chart recorder. Interestingly, the H3LIS331DL accelerometer is way better than ADXL345 when it comes to processing high-pressure variation more than 3900 PSI with in few seconds. It is noteworthy to say that the proposed IoT-based accelerometer to assess the pressure variation in the industry is considered for the first time as an electrical chart recorder.
Citation
Mohamed Razi morakchi , ZINE GHEMARI , MABROUK Defdaf , selmane djeffal, nacer belhout, , (2022-08-31), A NOVEL TECHNIQUE BASED ON IoT ACCELEROMETER FOR TRANSMITTING CIRCULAR CHART RECORDERS TO ELECTRICAL DATA, UPB Scientific Bulletin, Series C: Electrical Engineering, Vol:84, Issue:4, pages:275-286, The Scientific Bulletin
- 2022-07-20
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2022-07-20
Non Destructive Testing by Magnetic Leakage Flux Applied to Ferromagnetic Parts
The non-destructive magnetic flux leakage control is very important because it is used for conductive parts and is based on the circulation of a magnetic field through the thickness of the tube. Magnetic Flux Leakage (MFL) is a corrosion and crack detection technique for ferromagnetic materials, which is mostly utilized in metal pipelines and tanks. It is based on the use of a strong magnet to magnetize the equipment's wall. The magnetic field "escapes" from the wall where there is corrosion or a lack of substance. The magnetic field leakage is measured using a magnetic flux detector situated between the magnet's poles. A magnetic flux detector placed between the poles of the magnet measures the magnetic field leakage. A magnetic field sensor is also used in the magnetic leakage flux approach to obtain a defect signature. The magnetic leakage flux test works by magnetizing the part to be examined with a magnetic field and then detecting the leakage of the generated field lines with a magnetic sensor. The principle of magnetic leakage flux testing is to magnetize the component to be tested with a magnetic field and detect leakage of the field lines caused by the presence of a defect in the part using a magnetic sensor. In this work, we have given a description of the magnetic leakage flux sensors. We listed the Maxwell equations that regulate the MFL detection phenomenon, as well as a brief summary of the software utilized, COMSOL multiphysics, and a simulation result of this control. Last but not least, there's the transition from process to modeling. using a COMSOL multiphysics 3D simulation for low carbon and faulty steel sheet on the one hand, and for cylindrical parts with internal and exterior flaws on the other.
Citation
Merwane khebal , Abdelhak ABDOU , tarik Bouchala , Mohamed Razi morakchi , Abderrahmane aboura , ,(2022-07-20), Non Destructive Testing by Magnetic Leakage Flux Applied to Ferromagnetic Parts,3rd International Conference on Applied Engineering and Natural Sciences,Konya/Turkey.
- 2022-07-20
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2022-07-20
MEMS accelerometer and gyroscope in navigation technology
This paper provides an overview of the use of Micro-Electro-Mechanical Systems (MEMS) accelerometer and gyroscope in navigation technology. We present the principles of operation, advantages and limitations of MEMS accelerometer and gyroscope. We also discuss the various accelerometer types and gyroscope to improve the navigation accuracy. We highlight the applications of MEMS accelerometer and gyroscope in various fields such as mobile devices, autonomous vehicles, and drones. Furthermore, we also explore the challenges and future research directions in the field of MEMS accelerometer and gyroscope technology in navigation. This paper gives a comprehensive understanding of the use of MEMS accelerometer and gyroscope in navigation technology and it will be useful for researchers and engineers working in this field.This paper provides an overview of the use of Micro-Electro-Mechanical Systems (MEMS) accelerometer and gyroscope in navigation technology. We present the principles of operation, advantages and limitations of MEMS accelerometer and gyroscope. We also discuss the various accelerometer types and gyroscope to improve the navigation accuracy. We highlight the applications of MEMS accelerometer and gyroscope in various fields such as mobile devices, autonomous vehicles, and drones. Furthermore, we also explore the challenges and future research directions in the field of MEMS accelerometer and gyroscope technology in navigation. This paper gives a comprehensive understanding of the use of MEMS accelerometer and gyroscope in navigation technology and it will be useful for researchers and engineers working in this field.
Citation
Merwane khebal , Mohamed Razi morakchi , MABROUK Defdaf , Abderrahmane guezi , ZINE GHEMARI , selman djeffal, ,(2022-07-20), MEMS accelerometer and gyroscope in navigation technology,3rd International Conference on Applied Engineering and Natural Sciences,Konya/Turkey.
- 2022-07-20
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2022-07-20
Different MEMS-based accelerometers types
This paper presents an overview of different types of Micro-Electro-Mechanical Systems (MEMS) based accelerometers and their applications in various fields. We provide a comprehensive analysis of the different types of MEMS accelerometers, including capacitive, piezoresistive, and piezoelectric accelerometers. We discuss their advantages and disadvantages, such as sensitivity, power consumption, resolution, and frequency range. We also present the most recent advancements in MEMS accelerometer technology and their potential in various fields such as automotive, aerospace, consumer electronics, and healthcare. Furthermore, we also highlight the challenges and future research directions in the field of MEMS accelerometer technology. In summary, this paper provides a comprehensive understanding of the different types of MEMS-based accelerometers, their applications, and recent advancements, which will be useful for researchers and engineers working in the field of MEMS-based accelerometer technology.
Citation
Merwane khebal , Mohamed Razi morakchi , ZINE GHEMARI , MABROUK Defdaf , Lina aissaoui , salmane djeffal, ,(2022-07-20), Different MEMS-based accelerometers types,3rd International Conference on Applied Engineering and Natural Sciences,Konya/Turkey.
- 2022
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2022
The Best Choice Of The Capacitive Accelerometer Damping Rate For The Reduction Of The Measurement Error
MEMS accelerometers play important role in the field of sensors. The high demand for acceleromter is determined by their application. In the transportation industry, where they are used to activate safety systems, including airbags, systems of vehicle stability, and electronic suspension. Most MEMS accelerometers use capacitive sensing to detect small acceleration changes Because of their size and affordability Very Large-Scale Integration, VLSI. There are single and two-axis accelerometers therefore, a three-axis accelerometer is used to detect rollovers and deploy side airbags. Some of the advanced applications of multi-axis accelerometers include electronic stability control, automotive headlight leveling, and vehicle alarm. Three-axis accelerometer this type of seismometer inertial sensor can carry out all three axes acceleration or displacement simultaneously; MEMS capacitive accelerometer convert movements to signal electric The MEMS capacitive accelerometers are usually consisted two parts stator part fixed electrode and movable part a proof mass which is connected to the frame by an elastic element (spring). When the device is under movement, an inertial force displaces the proof mass varying the sensing gap or beams and the resulting capacitance change between the fixed and movable combs or electrode. The problem often with the accelerometer is the precision of sensitivity measurement, so we have to improve their parameters. The problem often with the accelerometer is the measurement accuracy, and to optimize it, the parameters of this device must be improved. The application of Newton's second law makes it possible to extract the mathematical model from the mechanical part of the accelerometer, assuming that the latter is considered as a mass, spring and damper system. To improve the measurement accuracy of the accelerometer to the maximum, it should reduce the measurement error to a value of 0.1% by the best choice of the damping rate.
Citation
MABROUK Defdaf , ZINE GHEMARI , Mohamed Razi morakchi , ,(2022), The Best Choice Of The Capacitive Accelerometer Damping Rate For The Reduction Of The Measurement Error,1st International Conference on Modern Electrical Engineering and Technology,Mohamed Cherif Messaidia University, Souk Ahras, Algeria
- 2022
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2022
Comparative study for capacitance variation for three damping ratios of capacitive accelerometer
The rapid advancement of (microelectromechanical system) MEMS-based accelerometer technology is due to their numerous benefits, including high sensitivity, low power consumption, minimal susceptibility to temperature variation, and low fabrication cost [1][2][3], The accelerometer has a wide spectrum of uses, including aeronautics[4], seismometer on mars [5], gravitational field gyroscope [6], the gyroscope of satellite [7] and its navigation [8]. Wireless ElectroCardioGram (ECG) and heart monitoring [9]. The method and mode of detection identify the type of accelerometer such as :piezoresistive based on the change of resistance[10],tunneling based on the change of current[8] optical, the working principle is based on the variation of the output light intensity versus the acceleration [7], capacitive based on the change of capacitance between electrodes[11] and piezoelectric a microscopic crystal arrangement gets strained by accelerating forces, and that generates an equal amount of potential difference. [12]. The capacitive is chosen and widely used in various fields due to their advantages approach to other design methodology [11] In our work, a comparative study of capacitance variation for its interesting advantages. In this simulation analysis, a mathematical relationship for parallel and is established between capacitance variation as function of displacement. Fig 1 as bellows shows an illustration of two parallel beams for capacity of accelerometer. Capacitance variation modelling for various damping ratios: A mathematical relationship between capacitance variation as a function of displacement is discovered in this simulation research. Figure 1 displays an illustration of two parallel beams for accelerometer capacity. The static capacitance relationship given by [13]: Equation 1 So, when the moving electrode displacement decreases, the capacity varies by the A area and distance between the electrode d and the permittivity of free space. Assume that there is an external force in the sensing direction, and that the movable proof mass is exposed to a force applied toward the right due to displacement x. Assume a tiny approximation of displacement. (x<< d), the top, bottom capacitance C1 And C2, respectively are changed to: Equation 2 According to fig.2, our suggested model has a higher sensitivity than the proposed models in [11] and [12]. The difference is not particularly noticeable, but it has a significant impact on the stability system. Finally, we conclude that the proposed value of damping rate makes it possible for develop a model of accelerometer more accurate and sensitive in terms of capacity variations. in future work we can extend to develop a novel design of capacitive accelerometer.
Citation
Mohamed Razi morakchi , selman djeffal, saida.dahmene@univ-msila.dz, ,(2022), Comparative study for capacitance variation for three damping ratios of capacitive accelerometer,The first national conference in Materials Science and Engineering (NCMSE’1_2022) on November 27– 28, 2022,Djilali Bounaâma Khemis Milliana University
- 2022
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2022
AN ARTIFICIAL NEURAL NETWORK-BASED APPROACH COUPLED WITH TAGUCHI`S METHOD FOR PREDICTING THE TOTAL AVERAGE DURATION OF PROJECTS
Nowadays, project duration prediction has become of crucial importance for managers since it points out the expectancy-life of project realization. To this end, the Neural Network-based approach coupled with the Taguchi method is used to predict the necessary time, which allows the fulfillment of the targeted project within the prescribed span without delay. Accordingly, the whole process for modeling the targeted problem is described, in which the modeling and simulation of the activities network are introduced for calculating the total average time of the project. Then, the neural network approach is adopted to predict the total time for finishing the considered project within the deadlines, where the neural network`s input variables are composed of success probability, improvement, and learning factors. While, the output variable is the total average project duration, which is the critical data during the design phase. After that, the well-known Taguchi method is purposefully used to optimize the already obtained target by a neural network. Finally, Simulation analysis through MATLAB is used to show the efficiency of the proposed approach regarding the workability of the approach when it comes to estimating the deadline of the targeted project.
Citation
Mohamed Razi morakchi , bendada larbi, brioua mourad, djeffal selman, , (2022), AN ARTIFICIAL NEURAL NETWORK-BASED APPROACH COUPLED WITH TAGUCHI`S METHOD FOR PREDICTING THE TOTAL AVERAGE DURATION OF PROJECTS, International Journal of Production Technology and Management (IJPTM), Vol:13, Issue:1, pages:44-55, IAEME
- 2022
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2022
PREDICTION OF AVERAGE TOTAL PROJECT DURATION USING ARTIFICIAL NEURAL NETWORKS, FUZZY LOGIC, AND REGRESSION MODELS
The prediction of the project`s expectancy life is an important issue for entrepreneurs since it helps them to avoid the expiration time of projects. To properly address this issue, a Neural Network-based approach, fuzzy logic, and regression methods are used to predict the necessary time consumed to end the targeted project. Before applying the three aforementioned approaches, the modeling and simulation of the activities network are introduced for calculating the total average time of project. Then, comparatively speaking, the neural network, fuzzy logic, and regression method approach are compared in terms of prediction accuracy. The generated error from the three methods is compared, namely different types of errors are calculated. Basically, the input variables consist of the probability of success (PS), the coefficient of improvement (Coef_PS), and the coefficient of learning (CofA), while the output variable is the average total duration of the project (DTTm). The Predicted mean square error (MSE) values are purposefully used to compare the three models. Interestingly, the results show that the optimum prediction model is the fuzzy logic model with accurate results. It is noteworthy to say that the application in this paper can be applied to a real case study.
Citation
Mohamed Razi morakchi , bendada larbi, brioua mourad, djeffal selman, , (2022), PREDICTION OF AVERAGE TOTAL PROJECT DURATION USING ARTIFICIAL NEURAL NETWORKS, FUZZY LOGIC, AND REGRESSION MODELS, INTERNATIONAL JOURNAL OF MANAGEMENT (IJM), Vol:13, Issue:7, pages:1-13, IAEME
- 2022
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2022
The ideal capacitive accelerometer damping rate choice to minimize the measurement error
For its remarkable features, accelerometers are widely used in a wide range of fields yet accelerometers vary in terms of accuracy which significantly impacts the accelerometers measurements errors. To this end, in this paper, the previously achieved results of the damping rate are compared with the proposed one that aims at reducing the measurement error. Firstly, the different types of accelerometers and their definitions are introduced. Secondly, the electromechanical-based mathematical model of accelerometer is derived. Thirdly, a comparative study is conducted for the sake of comparing the already obtained results regarding damping rate and the proposed damping rate value in this current work. Then, the accelerometers stabilization when subjected to a harmonic vibration is evaluated in order to identify its performance. Finally, simulation examples through MATLAB are carried out. In the first simulation, the measurement errors of accelerometers in function of frequency ratio are graphically presented through the implementation of two existing damping ratios and the obtained damping ratio in this research. Additionally, the variation capacitance through the utilization of two damping ratios and the proposed ratio. Based on the carried out simulations, the maximum measurement errors has decreased to 0.06 % when using the proposed damping ratio in this research, which itself proves the accuracy of the developed mathematical model.
Citation
Mohamed Razi morakchi , ZINE GHEMARI , MABROUK Defdaf , selman djeffal, ,(2022), The ideal capacitive accelerometer damping rate choice to minimize the measurement error,2022 2nd International Conference on Advanced Electrical Engineering (ICAEE),Constantine, Algeria
- 2022
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2022
Prototype of an affordable continuum robot-based IoT accelerometer and its kinematic modeling
The continuum robot-based IoT has been the focus of researchers over the last decades because of its affordability and cost-less manufacturing. To this end, in this paper, the continuum robot’s design is briefly described. Then the forward kinematic modeling (FKM) for a single-section continuum robot is derived and from which a new empirical formula for the FKM is proposed to simplify its mathematical complexity. After that, Particle swarm optimization (PSO) is adopted to figure out the inverse kinematic model of a single-section continuum robot. To verify the reliability of the proposed empirical formula as well as PSO efficiency, a graceful prototype of a continuum robot coupled with data logger named accelerometer 345 is attached to the robot’s end-effector to record its positions for given bending angles. Finally, the obtained robots' end effector positions from the accelerometer are used as inputs to PSO, and it found that the resulting bending angles from both PSO and the angle meter are overlapped. It is noteworthy to say that the proposed technique of logging a data-based accelerometer for tracking continuum robots is considered for the first time as an alternative technique to perfectly track the robot’s motion.
Citation
Mohamed Razi morakchi , MABROUK Defdaf , ZINE GHEMARI , selman djeffal, ,(2022), Prototype of an affordable continuum robot-based IoT accelerometer and its kinematic modeling,2022 International Conference of Advanced Technology in Electronic and Electrical Engineering (ICATEEE,M'sila
- 2022
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2022
Improvement of the vibration analysis technique by optimizing the parameters of the piezoelectric accelerometer
Condition-based maintenance is the most advanced form of maintenance because it is based on the actual state of the machine. It allows for better manage the interventions according to the state of the machine, its wear, or its degradation. The most widely used technique for this type of maintenance is vibration analysis because it detects the majority of faults in rotating machines. In this work, we studied the piezoelectric sensor which is considered the first element of the vibration measurement chain, and the modeling and simulation of the latter allowed us to improve their characteristics and their performance.
Citation
ZINE GHEMARI , salah belkhiri , Mohamed Razi morakchi , ,(2022), Improvement of the vibration analysis technique by optimizing the parameters of the piezoelectric accelerometer,2022 IEEE 21st international Ccnference on Sciences and Techniques of Automatic Control and Computer Engineering (STA),sousse Tunisa
- 2022
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2022
comparative study for capacitance variation for three damping ratios of capacitive accelerometer
The rapid advancement of (microelectromechanical system) MEMS-based accelerometer technology is due to their numerous benefits, including high sensitivity, low power consumption, minimal susceptibility to temperature variation, and low fabrication cost [1][2][3], The accelerometer has a wide spectrum of uses, including:s aeronautics[4], seismometer in mars [5], gravitational field gyroscope [6], gyroscope of satellite [7] and its navigation [8]. Wireless ElectroCardioGram (ECG) and heart monitoring [9]. The method and mode of detection identify the type of accelerometer such as :piezoresistive based on the change of resistance[10],tunneling based on the change of current[8] optical, the working principle is based on the variation of the output light intensity versus the acceleration [7], capacitive based on the change of capacitance between electrodes[11] and piezoelectric a microscopic crystal arrangement gets strained by accelerating forces, and that generates an equal amount of potential difference. [12]. The capacitive is chosen and widely used in various fields due to their advantages approach to other design methodology [11].In our work, a comparative study of capacitance variation for its interesting advantages. In this simulation analysis, a mathematical relationship for parallel and is established between capacitance variation as function of displacement. Fig 1 as bellows shows an illustration of two parallel beams for capacity of accelerometer. Then according According to fig.2, our suggested model has a higher sensitivity than the proposed models in [11] and [12]. The difference is not particularly noticeable, but it has a significant impact on the stability system. Finally, we conclude that the proposed value of damping rate makes it possible for develop a model of accelerometer more accurate and sensitive in terms of capacity variations. in future work we can extend to develop a novel design of capacitive accelerometer.
Citation
Mohamed Razi morakchi , SAIDA Dahmane , selman djeffal, ,(2022), comparative study for capacitance variation for three damping ratios of capacitive accelerometer,The first national conference in Materials Science and Engineering (NCMSE’1_2022),,khemis meliana
- 2022
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2022
Genetic Algorithm for Solving the Inverse Kinematic Model a Three-Section Continuum Robot with a New Design
Continuum robot has become omnipresent in the recent subjects of robotics due to its outstanding performance and dexterity yet its modeling issues still present an impediment to research. To this end, in this paper, Genetic algorithm is used for modeling a three section continuum robot. Firstly, an intricate description of the continuum robot is given, then the forward kinematic model of the considered continuum robot is derived. After that, the proposed GA algorithm is established that is governed by an objective function, which relates the robot’s end effector and the obstacle with the targeted trajectory. Finally, simulations examples through MATLAB software are carried out for the sake of showing the efficiency of the GA for solving the inverse kinematic model in the presence of a static obstacle. It is noteworthy to say that the proposed algorithm in this paper is the first one to be applied on a three section continuum robot with a new design.
Citation
Mohamed Razi morakchi , selman djeffal, mahfoudi chawki, ammar ghoul, ,(2022), Genetic Algorithm for Solving the Inverse Kinematic Model a Three-Section Continuum Robot with a New Design,The first national conference in Materials Science and Engineering (NCMSE’1_2022),,khemis meliana
- 2022
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2022
A Rolling Bearing Fault Identification Based on Vibration Signals Analysis Using DWT-DFT technique.
Abstract – Nowadays, the induction motors take preponderant place in modern industrial applications. However, due to hard operating conditions, these motors are exposed to different forms of damages that affects the stator, the rotor and the bearings. The bearing faults represent about 41 % of all other fault’s occurrences. In addition, the monitoring of these bearings can explored through the use of several physical quantities among them the vibration analysis is the most exploited to monitor and diagnose bearing defects. In this paper, we propose a diagnosis method for the identification of bearing faults by combining the Discret Wavelet Transform (DWT) and the Discret Fourier Transform (DFT). The DWT decomposes the signals corresponding to the two cases: outer race fault and inner race fault, to obtain details coefficients. A statistical study based on RMS and peak-to-peak factor, is then applied to the obtained details in order to select the optimum wavelet detail containing necessary harmonics conforming to the fault cases. The selection of the details obtained from the wavelet decomposition must respond to the highest value of both the RMS (Root Mean Square) and the peak-to-peak factor. The DFT is thereafter applied to the selected details to obtain the frequency spectrum for extracting the frequencies’ characteristics of bearing faults. The fault frequencies calculated theoretically that following the equations from (1) to (3) mentioned in [1], and exploiting the data of vibration signals measured at a sampling frequency of 12000 Hz and a motor speed of 1772 RPM, available in CWRU [2] are: the rotation frequency 𝑓𝑟 = 29.53 Hz, the outer race fault frequency 𝑓𝑜𝑟 =105.64 Hz and the inner race fault frequency 𝑓𝑖𝑟 =160.16 Hz. The results obtained by the Discret Fourier Transform are compared with those obtained theoretically that demonstrates well the effectiveness of the proposed method.
Citation
SAIDA Dahmane , FOUAD Berrabah , Mohamed Razi morakchi , ,(2022), A Rolling Bearing Fault Identification Based on Vibration Signals Analysis Using DWT-DFT technique.,4th International Conference on Applied Engineering and Natural Sciences,konya
- 2022
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2022
MEMS accelerometer and gyroscope in navigation technology
This paper provides an overview of the use of Micro-Electro-Mechanical Systems (MEMS) accelerometer and gyroscope in navigation technology. We present the principles of operation, advantages and limitations of MEMS accelerometer and gyroscope. We also discuss the various accelerometer types and gyroscope to improve the navigation accuracy. We highlight the applications of MEMS accelerometer and gyroscope in various fields such as mobile devices, autonomous vehicles, and drones. Furthermore, we also explore the challenges and future research directions in the field of MEMS accelerometer and gyroscope technology in navigation. This paper gives a comprehensive understanding of the use of MEMS accelerometer and gyroscope in navigation technology and it will be useful for researchers and engineers working in this field.
Citation
Mohamed Razi morakchi , ZINE GHEMARI , MABROUK Defdaf , ,(2022), MEMS accelerometer and gyroscope in navigation technology,ICAENS 2022,turkey
- 2022
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2022
Different MEMS-based accelerometers types
This paper presents an overview of different types of Micro-Electro-Mechanical Systems (MEMS) based accelerometers and their applications in various fields. We provide a comprehensive analysis of the different types of MEMS accelerometers, including capacitive, piezoresistive, and piezoelectric accelerometers. We discuss their advantages and disadvantages, such as sensitivity, power consumption, resolution, and frequency range. We also present the most recent advancements in MEMS accelerometer technology and their potential in various fields such as automotive, aerospace, consumer electronics, and healthcare. Furthermore, we also highlight the challenges and future research directions in the field of MEMS accelerometer technology. In summary, this paper provides a comprehensive understanding of the different types of MEMS-based accelerometers, their applications, and recent advancements, which will be useful for researchers and engineers working in the field of MEMS-based accelerometer technology.
Citation
Mohamed Razi morakchi , ZINE GHEMARI , MABROUK Defdaf , ,(2022), Different MEMS-based accelerometers types,Conference: 3rd International Conference on Applied Engineering and Natural Sciences,Konya/Turkey.
- 2022
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2022
Discret Wavelet Transform (DWT) for Detection of a Rolling Element Bearing Based on Kurtosis-Energy Selection.
Recently, fault detection in asynchronous motors has paid attention of many researchers. The monitoring of these machines is performed through of the use of several physical quantities, among them vibration analysis has a crucial importance for early detection of rolling bearing faults in induction motor (IM), which they represent about 41% of IM’s ensemble defects. Commonly, the induction motor operates under non-stationary operating conditions (varying speed, fluctuating load …), and that leads to the birth of non-stationary vibration signals. The vibration signals produced from the bearing cannot generate any information about the state of the machine. Therefore, a proper analysis of these signals by means of different signal processing tools allows us to determine if the entire rotating machinery is in a normal or abnormal state. In the field of bearing fault detection, signal processing though of fault diagnosis methods has taken preponderant place. Among these methods, Fast Fourier Transform is most frequently used enabling the signal decomposition without losing any information, but it is limited to non-stationary signals such as it cannot provide the temporal location of the appearance of another shock after the born of a first one. To overcome this limitation the Discret Wavelet Transform is used providing both of time and frequency location. In this paper, we propose a diagnosis method for the identification of bearing faults, which serves to combine the DWT (Discret Wavelet Transform) and the envelope analysis. The DWT decomposes the signals of the outer race defect and the inner race defect of the bearing to obtain details. These details will be then subjected to a statistical analysis based on the kurtosis and energy coefficient (EC) in order to select the optimum wavelet details including significant harmonics corresponding to the fault cases. The envelope analysis is then applied to the selected details for extracting the frequencies’ characteristics of bearing faults. The calculated theoretical faults following the equations (1)-(3) mentioned in [1] are the rotation frequency 𝑓𝑟=28.83 Hz; the inner race frequency 𝑓𝑖𝑟=156.34 Hz; the outer race frequency 𝑓𝑜𝑟=103.12 Hz, this all from exploiting the data of vibration signals that are measured at a sampling frequency of 12000 Hz and a motor speed of 1730 RPM, available in CWRU [2]. The selection of the details obtained from the signals corresponding to the outer race and the inner race defects must respond to the greatest value of both the kurtosis and the energy value. As shown in table I, detail 1 matches to the greatest value of the kurtosis and the EC. For the healthy bearing case, the chosen detail has the smallest values that confirms its undamaged case. Taken into account that a value of kurtosis lower than 3 belongs to a good state of the bearing. The results obtained by this combined method are compared with those obtained theoretically that demonstrates well its effectiveness.
Citation
SAIDA Dahmane , FOUAD Berrabah , BILAL DJAMAL EDDINE Cherif , Mohamed Razi morakchi , ,(2022), Discret Wavelet Transform (DWT) for Detection of a Rolling Element Bearing Based on Kurtosis-Energy Selection.,The First National Conference on Materials Science and Engineering (NCMSE'1_2022),Algiers Algeria
- 2021
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2021
Software of management and Storage of chemical Product
This paper presents a software solution for the management and storage of chemical products. The software offers a range of services aimed at reducing the risk of hazardous products and ensuring compliance with legal obligations. The software can inform and train employees, manage the storage of chemical and hazardous products, provide safety data sheets through QR code scanning, and facilitate communication. The software also includes technical documentation related to machinery and equipment and provides access to the stores of chemical products. The software aims to mitigate the consequences of poor storage and mismanagement, as exemplified by the recent explosion in Beirut.
Citation
Mohamed Razi morakchi , ,(2021), Software of management and Storage of chemical Product,The second safety International conference,United Arab Emirates
- 2021
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2021
Modélisation et perfectionnement de l'accéléromètre capacitif.
In this presentation, we will discuss the accuracy of accelerometers and present a novel solution to reduce measurement errors. The focus will be on the different types of accelerometers, their definitions, and the derivation of an electromechanical-based mathematical model. We will also compare the previous results of damping rate with our proposed solution, which has been tested through simulations using MATLAB. Our findings show that the use of the proposed damping ratio results in a maximum measurement error reduction of 0.06%, thereby demonstrating the accuracy of the mathematical model developed. This presentation will provide insights into the current state of accelerometer technology and highlight the significance of our contribution to the field.
Citation
Mohamed Razi morakchi , ,(2021), Modélisation et perfectionnement de l'accéléromètre capacitif.,Journée Doctorale en Electromécanique 2022 (JDELM’2022),University of Mohamed Boudiaf of M'sila