Tishreen University Journal -Engineering Sciences Series,

Generating a Dynamic Mesh by Simulation the Behaviour of Deformable Material using a Virtual Mesh

Nisrine mohamed — 2024-08-04

The suitability of a mesh for a dynamic motion of bodies is of paramount importance, where researchers in the field of numerical solutions of flow equations can simulate the movement of bodies underwater in a realistic manner. In this research, a dynamic mesh has been generated by approximating the motion of the finite elements mesh with the behaviour of a deformable material subjected to deformations. The displacement of the moving body at each time step serves as the boundary conditions that cause the finite elements mesh to move without deforming its shape. This method relies on dividing the computational domain into a limited number of finite elements with large geometric dimension, subjecting these elements to displacements and projecting the coordinates of the finite elements within the large elements; after the latter have undergone the displacement. Finally, this approach has contributed efficiently to conserving the quality of the mesh during the body motion.

A tool to measure the BIM Performance in Syrian higher education institutions

Lama saoud — 2024-08-04

The need to integrate BIM with education has increased recently to meet the labor market. Many international studies have provided tools to measure the performance of companies, organizations, and individuals wishing to adopt BIM, but there is a significant lack of tools to measure BIM performance for higher education institutions.

The research is concerned with developing the BIM maturity matrix model as a tool for measuring and improving BIM performance in higher education institutions. The developed model is based on selecting the most appropriate criteria for evaluating BIM maturity and defining several levels of maturity, based on interviews with stakeholders in Syrian engineering companies and colleges.

A tool is designed within Excel based on the developed model. The tool was applied to a case study of the Faculty of Civil Engineering at Tishreen University. Using the tool, the degree of maturity of the educational institution was measured, the strengths and weaknesses were explained, a plan was provided, and recommendations were made to improve the performance of BIM in the educational institution.

Enhancing Urban Traffic Efficiency Through Traffic Flow Prediction using Long Short-Term Memory Neural Networks

Majd Ali — 2024-08-04

Traffic congestion is a widespread issue affecting urban areas worldwide, leading to significant economic and environmental costs. Predicting traffic flow accurately is crucial for effective traffic management and planning. This study aims to develop a robust traffic flow prediction model that leverages the capabilities of Long Short-Term Memory (LSTM) neural networks in handling time series data. Suggested models were trained and tested on a comprehensive dataset, which included various traffic parameters provided by The Luxembourg administration of Ponts et Chaussées. The models achieved high accuracy in forecasting the average speed and flow rate in a studied location. So, the outputs can be used in an assistance system to help humane operators adjust traffic signal timings based on the predicted traffic conditions, reducing congestion and improving flow.

Comparison of water quality at the upstream and downstream points of the Sin River

Nisrine khalouf — 2024-08-04

The aim of this research is to evaluate the water quality of the upstream and downstream points of the Sin River using NSF WQI, weighted arithmetic and Canadian index techniques. For this purpose, samples were taken from the source point (Lake Al-Sin) and the downstream point (near the sea). The following parameters were measured: temperature, PH, iron (Fe), copper (Cu), and manganese (Mg), nitrate, nitrite... Water samples were collected on a monthly basis for one year. The three quality indicators were calculated at each point upstream and downstream. The results showed that the water at the upstream point was acceptable and deviates somewhat from natural water. At the downstream point, the quality of the water according to the indicators was that it was of little use and undesirable, as a result of the resulting materials that the river water carries. About washing agricultural soil rich in nitrogenous and phosphate fertilizers and agricultural waste, in addition to the products of local activities such as wastewater or the use of detergents containing phosphate, which can be a source of phosphate contamination of surface water.

Study of Non-Orthogonal Multiple Access (NOMA) technology performance over AWGN channel and Rayleigh fading channel

Farah Jnaikeh — 2024-08-04

The design of the next generation of wireless networks depends on introducing significant improvements, and uses highly spectral efficiency multiple access technologies due to the limited bandwidth resources available. As maintaining connectivity forms a challenge to spectral efficiency, and there is no single basic technology that can fit all 5G requirements, NOMA have become an option available for 5G and beyond because it is a promising technology that would satisfy the low latency requirements, huge number of connections and high data rate for this generation's networks.

This research examined this technique and compared it with traditional OMA techniques, explaining the principle of its functioning, and then examining mobile NOMA communication system performance over AWGN channel by evaluating BER performance versus SNR in addition to Rayleigh fading channel through studying the achievable capacity versus transmit power, as well as BER performance versus transmit power.

Study of the Seismic Behavior of Tunnels in the Closed Excavation Phase

IYAD SLITEEN — 2024-08-04

This paper presents a 3D numerical analysis of the influence of the excavation process on the soil-tunnel interaction under seismic loading. This issue requires a non linear analysis since the excavation procedure induces a perturbation in the stress distribution adjacent to the tunnel lining. Numerical analyses are conducted for both shallow and deep tunnel embedded in soft soils and under different seismic amplitudes. Results show that for shallow tunnel the excavation process has a significant influence on the overall seismic response of the soil-tunnel system.

Performance evaluation of GlusterFS and NFS in Cloud Environment

ahmad ahmad — 2024-08-04

In distributed storage, data is transmitted and stored remotely on the Cloud Storage Systems where data can be backed up and maintained and made available for the users anywhere. Outside users only see the Distributed File System (DFS) as a single storage device. Nowadays, the Need of storing huge amounts of data has become a great challenge. A DFS provides many advantages over a local file system such as reliability, scalability, security… etc. Therefore, it was necessary to improve storage techniques to achieve the desired goals by relying on distributing data on clusters of servers with high specifications and loaded with high-performance systems.

Although, there are a big set of distributed file systems, we have, in this paper, tested, from a performance point of view, two of the main known storage solution: GlusterFS, and NFS. As a distributed architecture, we studied their performance with different topologies and different transmitted data chunks, regarding: Read, Re-Read, Write, Re-Write Processes. Results showed that GlusterFS outperforms NFS, as NFS can only do a small subset of what GlusterFS offers.

The relative contribution of the raft in carrying Piled Raft foundation loads

Thara’a Mubarak — 2024-08-04

The Piled Raft system is a geotechnical composite foundation consisting of piles and raft (hat), with a high capacity against collapse. In traditional methods of the design of piles such as that adopted in the Syrian Arabic code, it is assumed that the role of the raft is to transport the load for piles, the total loads transferred from the building are distributed to piles only and therefore a large number of piles, while if the contribution of the raft is taken into account it can reduce the number of piles and thus reduce the economic cost. This research suggested a simplified method of calculating the contribution of the raft in carrying loads transferred from a previously studied building according to the Syrian Arab Code approach, this method relied on the principle of the additional impact of piles as raft pillars that reduce their settlement, this made the raft a judgment that contributed to the carrying of part of the loads, the raft's contribution rate to the suggested simplified method was 37.6% of the total load capacity, thus reducing the number of piles, meaning increasing the spacing between the pegs, this increases the efficiency of the work of the group of pegs in addition to reducing the economic cost. The suggested method was also compared with the Poulos method and the convergence between them reached 98.94%, the safety of the suggested method was also verified by calculating the safety factor according to Bandyopadhyay which reached FS_PR = 4.28.

Study of the effect of adding nickel on the properties of rust-resistant alloys

Youssef Deeb — 2024-08-04

This research aims to determine the behavior of paint or coating systems on rust-resistant alloys during oxidation processes. The well-known stainless steel alloy type (321) was chosen, and to study aluminum and nickel-aluminum plating systems in one stage at standard atmospheric pressure and at 1000 °C. ) Using the thermal cycle method, X-rays were used to determine the structure of the paint and the resulting oxide products.

Paint or varnish is usually used to promote the formation of a protective oxide crust. However, the results indicate that none of these coatings are completely resistant to oxidation, but the nickel-aluminum coating showed the greatest resistance to oxidation. This is due to the formation of an oxide layer (NiO) under the aluminized oxide layer (Al2O3), which improves oxidation resistance.

Improving the Performance of Wi-Fi Networks by Using the Hysteresis Margin to Reduce Ping-Pong Phenomenon

Ruba Daoud — 2024-08-04

The intensive use of wireless devices and the increasing need to support users wherever they are have prompted the search for solutions to enhance the capacity of local wireless networks to support seamless transitions between access points. This study presents a mathematical model for the handover process in wireless networks, specifically within WiFi networks. This model does not rely on a fixed and predetermined signal strength threshold (RSSI_Threshold) to initiate the handover process. Instead, the decision to trigger handover depends on the chosen station's signal strength surpassing the current station's signal strength by a margin known as the 'Hysteresis Margin'. This is designed to reduce frequent handovers and the ping-pong effect, particularly in the overlapping coverage area of the current and targeted access points, which adversely affects the continuity and quality of network connectivity. The model was implemented programmatically using Python to simulate and compare the handover process, and the results showed a reduction in the number of handovers when using the hysteresis margin method compared to the traditional method based on a fixed threshold. Furthermore, the study examined the impact of the hysteresis margin value and the distance between connection points on the reduction ratio, enabling the determination of the most suitable values according to the nature of the network.

BEHAVIOR OF COMPOSITE COLUMNS UNDER LATERAL LOADING

Ali Tawwalo — 2024-08-04

Composite columns are widely used in building structures, especially high-rise ones. They are considered of great importance because they depend on the principle of sharing between two materials that work together in one structural element while taking advantage of the advantages of each of them, as the tensile strength of steel and the pressure of concrete.

Composite columns are characterized by their high rigidity and good resistance, in addition to their plasticity property in cases of static and dynamic loading. The presence of concrete helps in resisting axial loads in addition to resisting lateral buckling and local buckling of the steel section. The concrete also contributes to protecting the steel section from fire and weather factors if the concrete is completely encased in the section.

To document the model, a numerical model was created using the ABAQUS program, identical to the experimental model tested by researchers Cristina Campian, Zsolt Nagy. The comparison included the response of the analytical and experimental model represented by the force-displacement curve, and the agreement rate exceeded 90%.

The numerical model was invested to study the behavior of four models of Composite columns under the influence of lateral loads. In the next stage, a comparative study was conducted of a building designed with reinforced concrete columns and then replacing them with Composite columns of the second model (IPE). The results have shown that the use of Composite columns is more efficient than reinforced concrete columns in terms of stiffness and resistance, and contributes to the same performance of reinforced concrete columns with sections smaller than the cross-sectional area of the longitudinal reinforcement bars used, which reflects positively on reducing dead loads and thus the economic cost and seismic forces in high-rise buildings.

Comparison between the effect of marble powder and some metal oxides on the flame resistance of unsaturated polyester

Roya Noman — 2024-08-04

The research aims to study the resistance of unsaturated polyester containing 4% marble powder to combustion at high temperatures under conditions similar to combustion conditions in industrial facilities, and to compare its behavior with other samples containing the same percentage of aluminum oxide and magnesium oxide. The samples were exposed to the oxyacetylene flame within a distance (6 cm) between the tip of the cone of the moderate oxyacetylene flame and the center of the sample for a time of (1 min).

The results showed similarity in the drilling time and mass loss rate for both samples containing marble powder and aluminum oxide, while samples containing magnesium oxide gave the best values. The flame resulting from burning the polyester sample containing aluminum oxide and marble powder spreads heterogeneously over the surface of the sample, and the smoke rising upon burning is dense, While the flame in the magnesium oxide sample maintained its color and nature, with a lower smoke density.

Studying the effect of changes occurring in a thermo-electrochemical cell using an electrogel and different types of Cathode metal

milad jokhadar — 2024-08-04

In this research, several types of thermo-electrochemical cell were studied,which utilize copper as the anode and various metals as the cathode (zinc, aluminum, chromium)in the form of thin sheets with dimensions of (50ˣ30ˣ1) mm, and using a gel electrolyte (electrogel) of sodium alginate with different concentrations (4%, 4.8%, 5.4%, 6.4%, 7.2%, 8%).A study was conducted of the effect of thevalue of the temperature difference between the electrodesandthe difference of the electrolyte concentration on the value of the open circuit voltage of the cell and on the value of the Seebeck coefficient of the cell .The results showed that the open circuit voltage increases with increasing the temperature difference between the two electrodes ∆T for all studied cells. So that the highest cell voltage (690 mV) was obtained when using copper-zinc electrodes and a concentration of 8% for the gel electrolyte, with a temperature difference betweenthe two electrodes (∆T= ). The best value of Seebeck’s coefficient ( =6.02 mv/k ) was also obtained with the same copper-zinc electrodes and a concentration (6.4%) of the gel electrolyte at a temperature difference between the electrodes of (∆T= ).

mproving the ductility of externally supported reinforced beams With reinforced polymer fibers and their increase

ahmed al-sayed — 2024-08-04

In the last two decades, the use of advanced composite materials such as Fiber Reinforced Polymers (FRP) in strengthening reinforced concrete (RC) structural elements has been increasing. Research and design guidelines concluded that externally bonded FRP could increase the capacity of RC elements efficiently. However, the linear stress-strain characteristics of FRP up to failure and lack of yield plateau have a negative impact on the overall ductility of the strengthened RC elements. Use of hybrid FRP laminates, which consist of a combination of either carbon and glass fibers, or glass and aramid fibers, changes the behavior of the material to a non-linear behavior. This paper aims to study the performance of reinforced concrete beams strengthened by hybrid FRP laminates.

This paper presents an experimental program conducted to study the behavior of RC beams strengthened with hybrid fiber reinforced polymer (HFRP) laminates. The program consists of twelve T-beams with overall dimensions equal to 460 x 300 x 3250-mm. The beams were tested under cyclic loading up to failure to examine its flexural behavior. Different reinforcement ratios, fiber directions, locations and combinations of carbon fiber reinforced polymer (CFRP) and glass fiber reinforced polymer (GFRP) laminates were attached to the beams to determine the best strengthening scheme. Different percentages of steel reinforcement were also used. An analytical model based on the stress-strain characteristics of concrete, steel and FRP was adopted. Recommendations and design guidelines of RC beams strengthened by FRP and HFRP laminates are introduced.

Design a Magnetic Bearing Control System to Reduce the Deflection of Rotating Shafts

Anas al-Sallomi — 2024-08-04

Magnetic bearings are based on the principle of using a magnetic field to lift rotating shafts and therefore do not contain any friction or wear, which gives them high reliability in addition to speed that is not possible to achieve with other bearings, which can be easily achieved using these bearings.

The use of these bearings in rotating machines also reduces vibration in the machine, which improves the life of the machine and thus increases its periodic maintenance periods..

The design of the control system for such bearings is considered the main point in the quality of the work of these bearings, as the control system works to read the deviation in the rotating axis within the bearing and adjusts it by adjusting the intensity of the current passing through its coils, which changes the intensity of the generated magnetic field and thus returns the axis to its position.

What we have done in this research is to design a traditional and advanced control system for a mathematical model of a rotating axis supported by a magnetic bearing using the MATLAB/SIMULINK program to reduce the deviation of the rotating axis within the bearing in order to reduce wear and tear in traditional bearings and increase the speed of rotation of these axes in machines, as the results showed. The use of an advanced control system for the magnetic bearing led to a greater reduction in axis deviations than the traditional control system.

Simulation of Torsion Vibration of Power Transmission Shaft in Marine Propulsion System using MATLAB

Alhadee Saleh — 2024-08-04

This research programmed and simulated the torsional vibrations affecting the capacity transfer shaft of the ship's propulsion station and assessed its impact on it both in the early design stages and during investment. Natural and forced frequencies, mode shape, and Campbell schemes were initially calculated, and the critical rotation speed at which the resonance occurs was determined to identify critical positions exposed to maximum stress. These calculations were made by modeling the rotary mass power station using Matlab software. Predicting vibration forms and critical rotation speed will allow the determination of the resonance field and thus propose design and investment solutions to reduce the causes of torsional vibration and mitigate its catastrophic damage to the propulsion system. Several analytical methods have been used to make calculations and compare these methods with each other. The propulsion system is assumed to be a linear system, and the inflammatory forces affecting it are harmonic forces. Ultimately, the proposed solution algorithm will be applied to a propulsion system for a real commercial ship with known characteristics and parameters.

Using the PSO algorithm to study the effect of shear stress on an I-shaped section on von Meses stress.

Ayham dwai — 2024-08-04

In this research, a section in the form of the letter I of one length, made of steel alloy st 37-2, loaded of [1] KN, and the Von Mises stress generated in the section under the influence of this load was studied. Then the PSO algorithm was used to obtain the optimal dimensions of the studied section that achieve the lowest possible shear stress under the influence of the same load, the inverter program was used to verify the results and determine the value of the von Mises stress for the resulting section.

Effect Of Foaming Agent Content And Fineness Modulus Of Sand On Mechanical And Physical Properties Of Foamed Concrete

Noura Joulak — 2024-08-04

Foamed concrete is categorized as a type of lightweight concrete, created by blending cement and sand with a foaming agent, that gives it the property of light weight compared to traditional concrete, it has various applications in construction field that differ from those of traditional concrete due to its varying densities.

This research aims to investigate the influence of foaming agent content (foaming agent to cement ratio) and sand fineness factor on the physical and mechanical properties of foamed concrete, where the focus lies on studying dry density and compressive strength, and this will be accomplished by creating mathematical relationships between them. Eight mixtures were prepared with a cement content of 350 kg/m³, a water-to-cement ratio (W/C) of 0.56, and a sand-to-cement ratio (S/C) of 0.25. In the first four mixtures, the foaming agent to cement ratio was varied, using a single type of fine sand. In the next four mixtures, the foaming agent to cement ratio was fixed, while the type of sand varied based on the fineness modulus values, where Four sand types were used with different fineness modulus values. Various tests were conducted to determine certain physical and mechanical properties of foamed concrete, including wet density, dry density, and compressive strength.

At the conclusion of this research, The findings highlighted the influence of foaming agent content and sand fineness modulus on the dry density and compressive strength values of foamed concrete. Additionally, Experimental mathematical relationships linking these parameters were also formulated.

Experimental study of using Synthetic Wax Additives (Sasobit) to design Warm Mix Asphalt

iyad sakour — 2024-08-04

In the last years, many researchers studied production of warm asphalt concrete by using organic, chemical and water-bearing additive.

The purpose of this research is to evaluate the use of Sasobit additive in the manufacture of warm asphalt mixes and studying the changes in properties of warm mix asphalt compared to the properties of hot mix asphalt.

The bitumen binder and Sasobit additive samples used in this work has been characterized. Two types of asphalt mixtures were done according to the Marshall method: Hot mixtures and warm mixtures containing different percentage of Sasobit additive (1, 1.5, 2)% by weight of bitumen binder, then the changes in the properties of warm asphalt mixtures modified with Sasobit additive were investigated and compared with reference mixtures.

Results of Marshall tests showed an increase in the ideal asphalt ratio in warm

asphalt mixtures compared to hot, low stability and density of WMA and indicated to success of the Sasobit additive in manufacture of warm asphalt mixes, at a suggested percentage of 1.5% of the total weight of bitumen binder, in which the physical and mechanical properties of the warm mix asphalt were close to the properties of the hot mix asphalt, with the need to study WMA resistance against moisture damage.

Planning foundations and programs - a critical study

Khouloud Jdeed — 2024-08-04

Planning foundations and programs represent the urban foundation upon which organizational plans in cities are built. They are guiding standards that must be adhered to and developed in a way that is compatible with spatial structures. Their results are measured and evaluated on a regular basis, to identify deficiencies within them and address and update them, for the purpose of achieving their goal of building a planning output that meets the requirements. Rapid urban growth.

Upon careful and analytical review of many organizational plans in Syrian cities (the Tartous city plan, for example), in the various stages of its development, we found that it was drawn up according to the foundations and planning programs that were formulated for the first time in the year 1970, and which turned into rigid templates, which left the inability of the planning programs and systems. Building, its planning output was the same depending on the different spatial and temporal structures, despite the great social, economic and political variables.

To address this problem with the burdens it placed on rapid, uncontrolled growth, and the uncontrollable adverse consequences it left behind (low standard of living - weak investment opportunities - poor health services - increased rate of violations on the regulatory plan - expansion at the expense of agricultural lands - deficit in... Public transportation system - population overcrowding...), it was necessary to conduct a critical analytical study of the planning mechanisms (planning foundations and programs) on which the organizational plans in Syrian cities are built, relying on a theoretical base of the basic concepts of urban planning at the global level, with analysis The precise planning mechanisms in the city of Seoul, as the fastest urban development, has historically moved from the foundations and programs of traditional urban planning to urban renewal in a sustainable manner, to achieve the goal of the research by the necessity of working on issuing foundations and planning programs that change with the change in time and place, taking into account spatial specificity and the temporal scope.

Evaluation of reliability in geodetic monitoring networks treated with Kalman filter

tammam skhiiah — 2024-08-04

You must be entitled geodetic monitoring networks accuracy conditions and permanence, and strength, and allergies, and the cost. Mathematically, the ideal design of a geodetic network requires minimizing or achieving a maximum of the cost function that indicates the quality of the network. Classically, a network can be optimized using the empirical method, error method, analytical methods, or by applying optimization techniques such as the Kalman filter algorithm. Therefore, the Kalman filter was used in designing and processing Geodetic monitoring networks Currently used to monitor strategic installations in country, which also enabled from Determine the system status, and check. This is in real time according to for the deformation model the appropriate. Which prompts geodesists to develop statistical tests for this filter, to verify the efficiency of treatment.

In this search, evaluated the level of reliability and robustness in geodetic monitoring networks treated with the linear Kalman filter, and used to monitor the movement situation in the Tishreen Dam in Latakia. This article also discussed the alternative derivation of the distribution of surplus values, which represents the basic element in the Kalman filter reliability theory, and the research presented a set of conclusions and recommendations.

Integration between Earned Value Method and risk analysis to monitor and track the risks of construction projects

Aows Abboud — 2024-08-12

The phase of monitoring and tracking the risks of construction projects is crucial to ensure the success of the project and achieve its objectives, as it includes all the necessary processes to apply the corrective measures to deal with risks appropriately. This phase is followed by internationally-known analytical methods such as the Earned Value Method (EVM), which evaluates the project’s performance and predicts future performance. However, it fails in calculating the effects of risk events on the final project cost and its completion time.

The research aims to develop a framework for integration between the earned value method and risk analysis based on BIM technology and Monte Carlo simulation (MCS) and apply it to a case of a residential construction project with the aim of helping project managers to provide accurate insights into project performance and predict potential problems before they occur, through conclusion of a new estimate (EAC) that includes the basic estimate plus the risk exposure cost, and the calculation of a new performance indicator resulting from dividing the new estimate by the basic project budget. The results have shown that if integration is conducted between EVM and risk analysis, it will be noted that there is a cost overrun of 39% for month 11 of project execution, and by 40% for the 12th month of project execution, thus providing a comprehensive overview of identifying sources of problems and proposing appropriate solutions to treat or prevent them.

Evaluation of kinetic and static methods of monitoring with GNSS systems after calibration in the Mobile Topographer pro application on the smartphone

Maher Ghatrouf — 2024-08-12

The development of low-cost Global Navigation Satellite System (GNSS) chips has inspired the development of advanced positioning, navigation, and timing devices. Due to their low cost, GNSS chips are now ubiquitous, such as smartphones, tablets, and wearable smart watches, with consumer GNSS receivers positioning accuracy of several meters under conditions an ideal observation, its accuracy is reduced to tens of meters under more complex observational conditions. In this research, the accuracy of each of the following was evaluated:

- Syrian stereographic horizontal coordinates before calibrating the application.

- Syrian horizontal stereographic coordinates after calibrating the application on one of the known coordinate points.

The results are presented in tables and graphs. The mean square error was around σ∆x= 0.659m and σ∆y= 0.518m after calibration and σ∆x= 2.945m and σ∆y= 2.379m before calibration. Through the results, the application can be used after calibration in geographic information systems and in real estate business.

Performance Evaluation of IM Fed by Developed Hybrid Multilevel Inverter (DHMLI)

Jafar Qureiosh — 2024-08-12

This paper presents the performance of a three-phase induction motor fed by a multilevel hybrid Inverter. This motor operates in a driving system of a port crane for small transporting containers /Electric elevator. This DHMLI provides the generation of several levels with different values to feed huge, high-power/medium loads with different medium or high voltages depending on the load to be fed. This DHMLI can be supplied from batteries, solar cells, or any other direct current source. This proposed DHMLI provides nearly sinusoidal voltages to feed the motor with a very low distortion coefficient (THD ≤ 4%), while significantly reducing the number of switches and other components. In addition, the hybrid multilevel inverter can generate high value output voltage at fixed frequency with lower switching losses, due to the high switching frequency and the proposed switch modulation (PDPWM) technique considering using (IGBT) as switches in internal design of the HMLI. Therefore, high performance and efficiency are obtained. High torque and flux control of the driven induction motor, which allows the stable operation of the crane / elevator and increase productivity when feeding the motor of the port crane from the proposed DHMLI. Achieving what are mentioned above will allow to change the value of the output voltage according to the varying of motor load and adjusting the motor speed within a specific and required range. This research paper will demonstrate the high performance, stable speed, and smooth control of the crane, since the motor is operated in a variable operating system mode within which the motor is exposed to multiple and constantly changing (starting, braking, and stopping). Performance evaluation will be achieved through the simulation of the components of the drive system independently and also for the entire system, then extracting the required curves which are analyzed in the Matlab/Simulink environment to confirm high performance characteristics and robust, considering the induction motor is the most widely used in industrial application.

Index Terms: Modified hybrid multilevel inverter (MHMLI), Total harmonics distortion (THD%), Performance evaluation(PE), Phase Disposition Modulation technology(PD), Induction motor(IM).

fault classification in electrical power transmission system Using Machine Learning Algorithms

راما الختيار — 2024-08-12

As high-voltage lines are an important component of the electrical power system, it is necessary to accurately classify faults on them, thus improving the quality of electrical power and increasing the stability of the system.

In this research, machine learning algorithms were relied upon to classify faults in electrical power transmission lines due to their reliability and accuracy of their results. The performance of two machine learning algorithms was compared: Decision Tree (DT) and Support Vector Machine (SVM) in distinguishing fault conditions. From the normal working condition and determining the type of fault on a 400 kV high tension line. The line was modeled and faults simulated in the SIMULINK environment in MATLAB, to generate fault type data at different values of fault resistance. The data was filtered and processed in a Python environment to be used in training these algorithms.

The results showed that the DT algorithm outperformed the SVM algorithm in fault classification under different system conditions..

Coating Graphene Oxide On Bronze (G-CU SN10) By Using Electrochemical Deposition To Improve Its Corrosion Resistance

humam mosalem — 2024-08-12

This research aims to shed light on the role of graphene in resisting corrosion occurring in DIN1705 graded bronze, which is widely used in manufacturing pump impellers. A layer of graphene oxide prepared using Hummer's method was deposited on the surface of the metal using electrochemical deposition technology, and The covering layer was confirmed using an X-ray diffraction device (XRD) and electron microscope (SEM). An immersion corrosion test was conducted on the metal in a medium containing a sodium hypochloride solution. The rate of corrosion resulting from the decrease in weight was calculated, and the results were compared to a non-corrosive sample. Covered, as the results indicated an increase in the corrosion resistance of the sample covered with graphene oxide at the expense of the other sample, which clarifies the importance of graphene oxide as a corrosion resistant.

Effectiveness Evaluation of Using Unmanned Aerial Vehicles (Drones) in Topographic Maps Production

lemar zalkha — 2024-08-12

With the increasing use of Unmanned Aerial Vehicles (Drones) in various fields nowadays, especially in mapping, there is a need for organized mechanisms and methodologies to assess the accuracy of this technology, as it is influenced by various factors. This study discusses the latest developments in processing drones’ images for photogrammetric applications and mapping, focusing on using the latest standards to evaluate the accuracy of products derived from drones’ images, such as Digital Terrain Models used to generate contour lines and orthophotos that represent the necessary base map for drawing the required map .and some theoretical concepts related to the use of drones for producing topographic maps were presented. The results of a case study conducted in Ain Al-Fijah area in Syria demonstrated the effectiveness of this technology, with overall accuracy of aerial triangulation 9.7 cm. Regarding vertical accuracy of Digital Terrain Model, and horizontal accuracy of orthophoto, they reached 23.7 cm and 15.5 cm respectively meeting American standards (ASPRS), which are the latest available standards for evaluating the accuracy of drones’ products. This is an acceptable accuracy for obtaining topographic maps at a scale of 1:10000.

Improving Wind Turbine Performance by Intelligent Pitch Angle Control

Zeinab Hammoud — 2024-08-12

This paper presents an effective control strategy for wind turbine that it ensure the continuity of its work and its benefits by producing energy and maintaining the life of the turbine despite the changing wind speed and its turbulence. This paper discusses pitch angle control at high wind speed to reduce the corresponding loads on the turbine and preserve its parts. Yaw angle control at low wind speed to get the maximum power out of the turbine. Artificial intelligence techniques have been used (neural networks and fuzzy logic) to design a controller capable of adapting to changing wind conditions. Neural network and fuzzy logic work effectively when the nature of the system is variable and non-linear. The proposed controller was compared with pid and fuzzy pid controllers, and the results showed that the proposed controller achieved better results in term of response speed and reduce steady-state error.

Modeling and simulation of a diesel engine cooling system with the aim of controlling its temperature and reducing electrical energy consumption and emissions

alaa laila — 2024-08-25

Advanced thermal management systems for internal combustion engines can regulate coolant temperature, consume less engine power, and positively impact environmental gas emissions and fuel economy by replacing conventional components with electrical actuators that can be controlled and operate in harmony with each other.

In this paper, a computer simulation model of a diesel engine cooling system was prepared. Initially, a mathematical model was developed that describes the heat transfer within the cooling system. In the next stage, a non-linear control algorithm based on Lyapunov stability was developed in an attempt to track the engine temperature and maintain the engine temperature. Required and reducing the electrical energy consumed by the system’s operators. Computer programming was done using the MATLAB language to verify the proposed control algorithm with the aim of arriving at and analyzing the results and graphs. Thus, the engine temperature can be adjusted and kept within the optimal range, and this will reduce energy consumption and emissions and extend the life of the engine.