ORIGINAL_ARTICLE
The Effect of Interior Color for Patients' Room on the Psychological Comfort for Patients of Oncology Medical Centers (Case Study Patients' Room of Oncology Center in Mansoura University).
The research aims to provide placement to treat the colors and its uses in the interior design of patient rooms in Oncology Medical Centers in order to achieve psychological comfort within these spaces for patients, because the color is playing vital role in the interior design and occupies an important place in all aspects of our activities, the impact of the colors on us in the space will reflect on the sense of the patient sensory and muscle. So the colors are chosen in a space according to several considerations have been clarified by research. The research proved its claim that colors affect a strong influence and direct the psychological comfort of patients in their rooms in oncology centers and that is through a theoretical study where the research reviews the importance of color and use it and understand its impact on the space, the philosophy of the use of color through the attributes and their meanings, the relationship between color and light, function of the colors in interior design, and the effect of color on human behavior, also through the analytical study of patient rooms in MD Anderson Cancer Center in America and apply them to patient rooms in Oncology Center, Mansoura University. The research at the end makes recommendations to enable the optimal use of colors in the interior spaces in Oncology Medical Centers.
https://bfemu.journals.ekb.eg/article_121968_a7a719ac7cd45fe3b216634a08e6463e.pdf
2020-11-07
1
15
10.21608/bfemu.2020.121968
Heba
Abdu
arch_heba84@yahoo.com
1
Assistant Professor., Architectural Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
LEAD_AUTHOR
Mohamed
Abou-Liela
mmshlila@mans.edu.eg
2
Assistant Professor., Architectural Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
AUTHOR
Lamis
El-Gezawy
lamiselgizawi@yahoo.com
3
Professor of Architectural Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
AUTHOR
ORIGINAL_ARTICLE
Using Simulation for Studying the Influence of Residential Floor Dissimilarity and its Height on the Thermal Performance of Spaces in Residential Buildings in Hot Arid Desert (Case Study: New Assiut City).
The building shape and spaces greatly influence ambient temperatures in those spaces. The thermal performance of interior spaces is highly influenced by a number of factors. On top of these factors are: space ratios (height, width, length), walls (thickness, construction material), window openings (height, width, length). As for the factors that determine a building mass, the most important are: shape of building mass, building orientation, using inner courts, etc. The present generation of climatic design tools should rely more on digital presentation by computers, in order to aid designers make sound design decisions based on visible results. Thus, the computer carries out all calculations thus relieving specialized designers in order to reach reliable results. Due to the scarce use of simulation software in the climatic assessment of residential buildings; the study aims at studying the influence of residential floor dissimilarity and its height on the thermal performance of spaces in residential buildings at New Assiut City, Egypt. To achieve this aim, the research is done by the analytical and applied methods, using the simulation software Thermal Analysis Software as a computer program, from the climatic analysis of New Assiut City - as well as identifying the prevailing residential patterns, and detailed study of the selected residential building, identifying the software used, and analyzing the simulation results for ambient room temperatures of the cold and hot periods - for the above mentioned of the selected model. The research ends with a number of results and recommendations. Such results may be applied in hot desert areas.
https://bfemu.journals.ekb.eg/article_121981_c441ddbc116dcebf701a762a9555fb05.pdf
2020-11-07
16
29
10.21608/bfemu.2020.121981
Ahmed
Mohammed
ahmed.monteleb@hotmail.com
1
Instructor., Architectural Engineering Department., Faculty of Engineering., Assiut University., Egypt.
LEAD_AUTHOR
Essam El-Deen
Mahroos
dr_essam_mahrous@yahoo.com
2
Professor of Architectural Engineering Department., Faculty of Engineering., Assiut University., Assiut., Egypt.
AUTHOR
Ezzat
Morghany
ezzatmorghany@yahoo.com
3
Associate Professor., Architectural Engineering Department., Faculty of Engineering., Assiut University., Assiut., Egypt.
AUTHOR
Essam
Saeed
essam_sss@yahoo.com
4
Assistant Professor., Architectural Design., Architectural Engineering Department., Faculty of Engineering., Assiut University., Assiut., Egypt.
AUTHOR
ORIGINAL_ARTICLE
Effect of Grid Foundation Shape on Soil-Foundation Interaction.
This work is concerned with the shallow grid foundation resting on homogen ous soil. The interaction between grid foundation and soil, where the expected penetration may occur was observed. So, small and high deformation analysis types were performed. A comparison between results for various loading cases has been obtained. The nonlinear beha- vior of soil material was defined by hardening plasticity cap model while elasticity model was chosen for the foundation. The analysis variables for grid foundation were performed again for a regular rectangular raft foundation. The relative stress distributions inside the soil for the two foundation geometries 'grid and rectangular' have been observed. The finite element Pro- gram Abaqus cae V.7.1 is the used in the analysis.
https://bfemu.journals.ekb.eg/article_121982_be94886a3dc68c411a9e7677cb9e3c24.pdf
2020-11-07
1
11
10.21608/bfemu.2020.121982
Adel
Dif
1
Professor of Structural Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
LEAD_AUTHOR
Aiman
Ibrahim
2
Lecturer at Structural Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
AUTHOR
Walaa
Othman
3
Structural Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
AUTHOR
ORIGINAL_ARTICLE
Predicting Delay Percentage of Water and Sewage Projects in Egypt: Regression Analysis versus Statistical-Fuzzy Approach.
This paper presents two models for predicting the delay percentage in water and sewage projects in Egypt. The first model based on regression analysis. 74 causes that lead to delay in water and sewage projects gathered from literature. A questionnaire survey was made on construction contractors of water and sewage projects in Egypt to evaluate the relative important of these causes. 14 causes were obtained as the most significant causes that affect the delay percentage (DP) and these are the independent variables of the proposed model. Data for the occurrence of the previous causes on a yes/no basis and the corresponding DP( dependent variable ) for 20 water and sewage projects was collected . The data was divided into two sets, the first set contains 12 projects for the purpose of model building. The results revealed that there was a strong linear relationship between DP and 9 causes from 14 causes that significantly affect DP projects. The second set contains 8 projects for the validation purpose and comparison with the second model. The second model is a statistical fuzzy approach which is a hybrid approach from fuzzy logic and regression analysis. A regression equation between each cause and DP using projects of first set was extracted. The relative weight of each cause is determined by its coefficient of determination (R2) VALUE. The degree of severity each cause had received from questionnaire analysis was used to fuzzify this cause. A trapezoidal membership function was used to represent he delay percentages in water and sewage projects in general depending on 18 out of the previous 20 projects. Two projects Were excluded from this function due to their divergence values from other projects. Thus, the expected delay percentage of a project is then determined using fuzzy rules. Validation of the two models using projects of the second set revealed that regression model has prediction capabilities higher than that of statistical fuzzy model.
https://bfemu.journals.ekb.eg/article_121998_e147e9dd822d9dc00047afbde85dfc64.pdf
2020-11-07
12
27
10.21608/bfemu.2020.121998
Regression Analysis
Questionnaire Survey
Statistical Fuzzy Model Water and Sewage Projects
A.
El-Kholy
1
Assistant Professor of Civil Engineering Department., Delta Higher Institute of Engineering and Technology., Mansoura., Egypt.
LEAD_AUTHOR
ORIGINAL_ARTICLE
Applying the Mechanistic Empirical Pavement Design Guide under the Egyptian Conditions.
Pavement structural design is a complicated task; traffic loads, characterizations of pavement materials and climatic conditions all are factors must be taken into consideration during the design process and it is important to understand how each factor affects the overall performance of the pavement structural design. For many years, extensive research has been performed on the refinement and development of pavement structural design procedures such as, (Empirical Methods, Limiting Deflection Failure Methods, Stone Matrix Asphalt and AASHTO 1993). All mentioned methods does not take into consideration the pavement performance or it does not take all important factors which affect the pavement performance like ( Traffic loads, Climatic conditions and Material characterizations ) [1], But now the Mechanistic-Empirical Pavement Design Guide (MEPDG) which was created by the AASHTO organization in 2002 can be used. This design method allows engineers to design pavement structural layers to sustain predefined limits of distress levels due to traffic loads and environmental conditions based on mechanistic empirical locally or nationally calibrated performance models. The user is required to input variables related to traffic, environment, HMA, base/sub-base and sub grade characteristics. This paper is focused upon the ability of using the MEPDG under the Egyptian conditions and the modifications needed to use it in Egypt comparing it with other used methods in Egypt and it was found that it is possible to use the MEPDG in Egypt and replace the American climatic data by the Egyptian one also the distresses on the chosen Egyptian roads were predicted
https://bfemu.journals.ekb.eg/article_122002_e8df297e026351658d47b7f7478bd5f8.pdf
2020-11-07
28
38
10.21608/bfemu.2020.122002
Mechanistic-Empirical Pavement Design Guide
MEPDG
Fatigue Cracking
rutting
M.
Elshabrawy
1
Professor of Public Work Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
AUTHOR
M.
Ibrahim
mohamed.ibrahim@feng.bu.edu.eg
2
Associate Professor., Public Work Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
LEAD_AUTHOR
O.
Elbagalati
3
Public Work Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
AUTHOR
ORIGINAL_ARTICLE
Mechanical Properties of Concrete Made of Crushed Concrete Subjected to Different Fire Durations.
The amount of construction and demolition waste has increased considerably over the last few years. The heaviest materials found in construction and demolition waste are rocks, concrete and ceramic residues. Nowadays, almost all demolished concrete has been mostly dumped to landfills. From the viewpoint of environmental preservation and effective utilization of resources, the interest in using recycled materials derived from construction and demolition waste is growing all over the world. Crushing concrete to produce coarse arrregate for the production of new concrete is one common means for achieving a more environment-friendly concrete. This reduces the consumption of the natural resources as well as the consumption of the landfills required for waste concrete. From the durability point of view, the performance of recycled concrete exposed to fire or high temperatures is not a very well-known subject since this property has been widely studied on conventional concretes. Such performance is related to the temperature level reached at the surface and interior of the material, the time of exposure. Also, the concrete's own characteristics such as w/c ratio, type of natural aggregate used. In the experimental work, the fresh properties (slump test) and the hardened properties, (compressive strength, splitting tensile strength, and flexural strength) were carried out. A total of thirty concrete mixes with different cement contents (300, 350, and 400 Kg/m3) at w/c ratio (0.5) were made and the percentag of substitution of natural narse aggregate by the recycled concrete aggregate subjected sto fire temperature 600°C for (1, 2, and 3 hours) was (0%, 25%, 50% and 100%). In the process of mixing, equal consistence among all concrete mixes was achieved. The obtained results indicate that the recycled coarse aggregate subjected to fire can successfully be used for making structural concrete.
https://bfemu.journals.ekb.eg/article_122151_6d70f81bafef7bab79c1b3749ff1bd1e.pdf
2020-11-08
39
51
10.21608/bfemu.2020.122151
W.
Fahmy
1
Faculty of Petroleum and Mining Engineering., Suez Canal University., Suez., Egypt.
LEAD_AUTHOR
E.
Heneidy
2
Civil Engineering Department., Faculty of Engineering., Suez Canal University., Ismailia., Egypt.
AUTHOR
E.
Ali
3
Material Department., Housing and Building National Research Center-Dokki-Cairo., Egypt.
AUTHOR
I.
Agwa
4
Civil Structural Engineering Department., Faculty of Industrial Education., Suez Canal University., Suez., Egypt.
AUTHOR
ORIGINAL_ARTICLE
Effect of Moisture on Durability of HMA used in Roads Adjacent to Waterways.
Studies on the durability assessment have generally been performed to gain Information on the resistance of bituminous mixtures against water. This paper proposes a new technique to investigate the influence of water on Asphalt Mix Durability and hence developing a new criterion for estimating the performance of the HMA used in roads adjacent to waterways through the "Durability Index". The proposed method involves subjecting standard Marshall HMA samples of both 3-D and 4-C types, which are the most common-used HMA mixes in Egypt, to cycles of time series moisture-Immersion process at 60°C for 6h, 12h, 1day, 3days, and 7days periods to simulate their exposure to water in field. These samples were then tested for stability and percentage of stripping for each individual period. On the other hand, the same procedures and tests were proceed on field cylindrical samples that core-cut from roads adjacent to waterways under different moisture conditions fortest results comparison. Based on selected criteria, a theoretical model that fulfills these criteria was adopted to assess the durability performance of the assigned HMA. This parameter is derived from the "accumulative loss of stability" values along the above-mentioned time series. It was continued up to the minimum required value for stability as per ECP-2010 reached. This criterion is revealed as the "Durability Index" which could be utilized in predicting the future performance and durability of different asphalt mixes intended to be used especially in roads adjacent to waterways.
https://bfemu.journals.ekb.eg/article_122153_52ab3ee2c9b12b3bea3004a1f279d325.pdf
2020-11-08
52
63
10.21608/bfemu.2020.122153
Durability
stability
immersion
HMA
Waterways
Mohammed
El-shabrawy
1
Public Works Engineering Department., Faculty of Engineering., El-Mansoura University., Egypt.
LEAD_AUTHOR
Tarek
Saafan
2
Irrigation & Hydraulics Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt
AUTHOR
Mourad
Ibrahim
mourad0412@hotmail.com
3
Public Works Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt
AUTHOR
Alaa
Ali
4
Public Works Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
AUTHOR
ORIGINAL_ARTICLE
Study of Convective Heat Transfer Enhancement of Nanofluid inside Tube.
Nanofluids are suspensions of metallic or nonmetallic nano-powders in base liquid and can be employed to increase heat transfer rate in various applications. In this work laminar flow forced convection heat transfer of (Al2O3 or CuO)/water nanofluid inside a circular tube with constant wall heat flux is investigated experimentally. The Nusselt numbers of nanofluids are obtained for different nano particle concentrations as well as various Reynolds number. Experimental results emphasize the enhancement of heat transfer due to the nano-particles presence in the fluid. Heat transfer coefficient increases by increasing the concentration of nano-particles in nanofluid. The increase in heat transfer coefficient due to presence of nano-particles is much higher than the prediction of single phase heat transfer correlation used with nanofluid properties. Considering the factors affecting the convective heat transfer coefficient of the nanofluid, a new convective heat transfer correlation for nanofluid under single-phase flows in tube is established. Comparison between the experimental data and the calculated results indicate that the correlation describes correctly the energy transport of the nanofluid. The range of operating parameter is Reynolds number from 500 to 2500 and particle volume concentrations up to 2.0%. Comparison between present and pervious results is carried out.
https://bfemu.journals.ekb.eg/article_122158_fc92fa5ece2dfc357b17a3b976d711b5.pdf
2020-11-08
1
19
10.21608/bfemu.2020.122158
: Nanofluid
Convective
heat transfer
correlation
friction factor
Thermal-hydraulic performance
F.
Arid
1
Mechanical Power Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
LEAD_AUTHOR
E.
Elshafei
2
Mechanical Power Engineering Dept., Faculty of Engineering., El-Mansoura University Mansoura., Egypt.
AUTHOR
Mohamed
Mousa
mgmousa@mans.edu.eg
3
Professor of Mechanical Power Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
AUTHOR
Omer
Elkandary
4
Associate Professor., Mechanical Power Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
AUTHOR
ORIGINAL_ARTICLE
Computer Aided Selection of Optimal Non-Traditional Machining Processes.
Manufacture of a product in a desired shape and size with specific characteristics and properties depend not only on the design of the product but also on the selection of the appropriate manufacturing process(es) that requires knowledge about various available alternatives. This paper presents a software for selecting an optimal non-traditional machining process(es). It has been developed using MATLAB, version (V7.8) release (R2009a), as programming language with the help of graphical user interface (GUI), visual aids, and fuzzy logic toolboxes. The selection procedures are based on elimination and ranking technique, and have been tested with a case study.
https://bfemu.journals.ekb.eg/article_122166_b5d9f1281e83455a6e6d15ca89349539.pdf
2020-11-08
20
29
10.21608/bfemu.2020.122166
Non-Traditional Machining
Fuzzy Logic
Membership Function
IF-THEN Rules
Sugeno fuzzy logic inference system
Suitability Index
T.
El-Midany
1
Professor of Production and Mechanical Design Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
LEAD_AUTHOR
M.
Al-Makky
2
Professor of Production Engineering Department., Faculty of Engineering., Alexandria University., Alexandria., Egypt.
AUTHOR
H.
El-Shourbagy
3
Assistant Professor., Production and Mechanical Design Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
AUTHOR
S.
El-Bahloul
sara_elbahloul@hotmail.com
4
Instructor., Production and Mechanical Design Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
AUTHOR
ORIGINAL_ARTICLE
Performance of Cylindrical Plastic Solar Collectors for Air Heating.
A theoretical and experimental study including the combined convective and radiative heat transfer analysis of a flexible cylindrical type solar air - heater for circular and two elliptic shape with 0.55 and 0.65 m major axis are presented. The solar collector is manufactured from LDPE films acting as a black absorber with a back insulation and double transparent covers sealed together along its edges. The collector is to be blown with a flow of pressurized air. A computer program is written for calculating the outlet temperature and collector thermal efficiency. Moreover the Nusselt number between the absorber and the heated air is determined experimentally in relation with the Reynolds number. Comparisons between the experimental data and the theoretical methods for the collector efficiency demonstrate a good agreement. In addition of this, the present experimental results of Nusselt number are correlated and compared with a correlation of another authors.
https://bfemu.journals.ekb.eg/article_122169_d3c39906a018940574b003a2dbab16fd.pdf
2020-11-08
30
38
10.21608/bfemu.2020.122169
Solar Collectors
air-heaters
theoretical analysis
experimental investigations and performance
M.
Bassiouny
1
Mechanical Power Engineering Department ., Faculty of Engineering., Menoufia University., Shebin El-Kom., Egypt.
LEAD_AUTHOR
A.
Abddullah
2
Mechanical Power Engineering Department., Faculty of Engineering., Tanta University., Tanta., Egypt.
AUTHOR
ORIGINAL_ARTICLE
A Proposed Performance Prediction Approach for Manufacturing Process Using Artifical Neural Networks.
This paper aims to provide an approach to predict the performance of parts produced after multi-stages manufacturing processes, as well as assembly. Such approach aims to control and subsequently identify the relationship between the process inputs and outputs so that a process engineer can more accurately predict how the process output will perform based on the system inputs. The work is guided by a six-sigma methodology to obtain improved performance. In this paper a case study of the manufacture of a hermetic reciprocating compressor is presented. Each of manufacturing stages is separate and affects to the functionality of the end product. The application of artificial neural networks (ANNs) technique is introduced to improve performance prediction within this manufacturing environment. The results demonstrate that the approach predicts accurately and effectively.
https://bfemu.journals.ekb.eg/article_122176_c162404a0f73c5bb073cc5e7e69e0d30.pdf
2020-11-08
39
49
10.21608/bfemu.2020.122176
performance prediction
Six Sigma
Artificial Neural Networks
quality control
Hermetic reciprocating compressor manufacturing
T.
El-Midany
1
Professor of Mechanical Power Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
LEAD_AUTHOR
M.
El-Baz
2
Department of Mechanical Power Engineering , Faculty of Engineering , Zagazig University , Zagazig , Egypt
AUTHOR
M.
Abd-Elwahed
3
Specialized Studies Academy., Workers University., Egypt.
AUTHOR
ORIGINAL_ARTICLE
A Future Image for Web Services' Discovery with a Client Web Based Interface.
Web Services' discovery is a very important issue related to Web Services. From Syntax and using match-making words to semantic web and taking QoS parameters into account for selecting between Web Services having the same functionality for finding the best service that fulfills the customer's requirements . In this paper we put a future image for Web Services' Discovery by merging both UDDI and Search Engines, as the new trend in Web Services' Discovery is building a central repository storing all Web Services after collecting them from UDDI , different UBRS ... , this central point will be a reference to the client for searching the required Web Service Two datasets one contains 365 WS and the other 2500 WS used in the experimental work .Our work will cover two phases from the suggested model phase4 and phase6 fig. (3). Classifying Web Services before storing them will enhance the search process and it could be a step for building open web directory contain all Web Services like that used for searching web sites for a specified issue(ODP, DMOZ..), Online databases maintain a collection of structured domain-specific documents dynamically generated in response to users' queries instead of being accessed by static URLs. We also proposed a client GUI that will will enable the Web Service consumer to easily access data stored inside these databases that contain updated frequently data of Web Services information collected ,classified and stored using different crawlers. This will facilitate and enhance the Web Services' Discovery process , client will be able to select between Web Services due to QoS requirements and find the best Web Service that fulfills his/her requirements
https://bfemu.journals.ekb.eg/article_122332_97039c7ef66417b126322c7998fe7088.pdf
2020-11-09
1
18
10.21608/bfemu.2020.122332
Web services discovery
Semantics Web Services
WSCE
GUI
UDDI
WSDL
search engines
Crawlers
QOS
classification
Amal
Yousief
ayma_64@hotmail.com
1
Systems and Computers Engineering., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
LEAD_AUTHOR
Hisham
Khalifa
h_arafat_ali@mans.edu.eg
2
Professor of Computers and Systems Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
AUTHOR
Ahmed
Saleh
aisaleh@yahoo.com
3
Professor of Systems and Computers Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
AUTHOR
ORIGINAL_ARTICLE
Neural Network Based Fault Detector and Classifier for Synchronous Generator Stator Windings.
This paper presents an application of multilayer feedforward neural network (MFNN) as a differential protection for synchronous generators. Two MFNN are designed, trained, and tested in this paper. The first one has two outputs which detect the internal and external fault state. The other neural network has four outputs to classify the faulty phases. The proposed neural fault detector and classifier were trained using various sets of data available from a selected synchronous model and simulating different fault scenarios (fault type, fault location, fault resistance and fault inception angle). The results show very good behavior of the MFNN and it was more reliable and accurate than conventional methods. It shows that MFNN offer the possibility to be used for on line synchronous generator protection and give satisfactory results.
https://bfemu.journals.ekb.eg/article_122340_511c34b85221e080fe1c2279645101c2.pdf
2020-11-09
19
28
10.21608/bfemu.2020.122340
differential protection
Generator protection
Multilayer feedforward neural networks
Fault detector and classification
Ahmad
Hatata
1
Electrical Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
LEAD_AUTHOR
Ahmed
Helal
2
Assistant Professor., Electrical and Control Engineering Department., Faculty of Engineering., Arab Academy for Science and Technology., Alex., Egypt.
AUTHOR
Hesien
El Dessouki
3
Dept of Elec. Engineering and Control, Faculty of Engineering, Arab Academy for Science and Technology, Alex. Egypt.
AUTHOR
Magdi
El-Saadawi
m_saadawi@mans.edu.eg
4
Professor of Electrical Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
AUTHOR
Mohammed
Tantawy
5
Professor of Electrical Engineering Department, Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
AUTHOR
ORIGINAL_ARTICLE
Adaptive Control for Torque Ripple Minimization in PM Synchronous Motor.
This paper presents two methods for designing special purpose controllers for permanent magnet synchronous motor. The main target of the designed controllers is to reduce torque ripples of this type of motors. The first proposed adaptive method is based on two loop controllers (current controller and speed controller) in addition to using space vector pulse width modulation to maximize fundamental component of torque. The second proposed method is based on PI current controllers enabling tracking of quadrature current command values. Simulation results of the suggested adaptive controller are compared with that of the PI controller. Comparative analysis proves the effectiveness of the suggested adaptive controller than the classical PI one according to ripple reduction as well as dynamic response. Moreover, the suggested adaptive controller when compared with other controllers shows great success in torque ripples reduction, enabling speed tracking while minimizing the torque ripple. Key words—Model reference adaptive system, PM and provided by permanent magnets instead of being synchronous motor, torque control.
https://bfemu.journals.ekb.eg/article_122347_88cf27a16ea78513f1c0da31ba2d15ff.pdf
2020-11-09
42
52
10.21608/bfemu.2020.122347
Model reference adaptive system
PM system motor
Torque control
M.
Saafan
1
Instructor., Computer and Systems Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
LEAD_AUTHOR
A.
Haikal
2
Assistant Professor., Computer and Systems Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
AUTHOR
S.
Saraya
3
Assistant Professor., Computer and Systems Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
AUTHOR
F.
Areed
4
Professor of Computer and Systems Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
AUTHOR
ORIGINAL_ARTICLE
Performance Analysis of Avalanche Photodiode for Direct Detection LADAR Receivers.
LADAR systems constitute a direct extension of the conventional radar techniques. Because they operate at much shorter wavelengths, LADARs have the unique capability to generate 3D images of objects. These laser systems have many applications in the defense gelds concerning target detection and identification. The extraction of these features depends on the processing algorithms, target properties and 3D images quality. Our scope in this research is to use the Avalanche photodiode as a basic detector in three dimensional imaging LADAR systems and analyze its behavior against different operating conditions. Avalanche photodiode in its linear mode gives good performance only for high count rate of photo-electrons. In the case of low count rates (extremely weak signals), this device must be biased above its breakdown voltage in order to have higher sensitivity. This situation is known in the literature as Geiger-mode operation. This mode of operation suffers from mean primary noise rates in the measured interval. This in turn may cause the detector not respond before receiving the desired signal. When the Avalanche photodiode is biased below its breakdown voltage with highest achievable gain value, and followed by an ultra low noise amplifier, it becomes sensitive to the single photo-electron. This operating mode is called Linear-mode single photon. The operation of the detector in this mode overcomes the drawbacks of the Geiger-mode. Detection and false alarm probabilities are analyzed for each one of these operating situations.
https://bfemu.journals.ekb.eg/article_122348_80cd7df607853e3880f75cd24675bd6e.pdf
2020-11-09
53
69
10.21608/bfemu.2020.122348
Avalanche photodiode
Three-Dimensional Imaging
Direct detection
Ladar
Mohamed
El_Mashade
elmashade@yahoo.com
1
Professor of Electrical Engineering Department., Faculty of Engineering., Al Azhar University., Nasr City., Cairo., Egypt.
LEAD_AUTHOR
H.
Konber
2
Electrical Engineering Department., Faculty of Engineering., Al-Azhar University., Nasr City., Cairo., Egypt.
AUTHOR
M.
Ashour
3
Department of Electrical Engineering., Faculty of Engineering, Al_Azhar University, Nasr City , Cairo, Egypt
AUTHOR
A.
AboElEzz
4
Electrical Engineering Department., Faculty of Engineering., Al-Azhar University., Nasr City., Cairo., Egypt.
AUTHOR
ORIGINAL_ARTICLE
Distributed Generation Approach for Single Step System Restoration during Cold Load Pickup.
When a system is restored after an extended outage, the demand is greater than that was before the outage. The increase in the demand is due to the cold load pickup (CLPU) condition. The attempt to restore such load simultaneously will cause an excessive loading on the network elements in addition to limits violation. For these reasons, step-by-step restoration was suggested to overcome such problem. However, this way of restoration requires a long time for the complete system to be back to service. In this paper, a particle swarm optimization (PSO) algorithm is introduced to find the optimal sizing and siting of distributed generation (DG) units for simultaneous single step restoration of transmission and distribution networks. The aim of the proposed DG allocation algorithm is to reduce the distribution transformer loss of life due to overloading and to reduce the lost load and hence the additional power demand caused by CLPU. The capacity of the DG required is determined on the basis of additional power demand and the load diversity preserved. The proposed algorithm is applied to the Egyptian 66 kV transmission network in the city of Alexandria including a 33-bus and a 69-bus, 11 kV primary distribution feeders.
https://bfemu.journals.ekb.eg/article_122351_44fbe7c39e071ddd4b74d025c7dddada.pdf
2020-11-09
70
78
10.21608/bfemu.2020.122351
Single step restoration
Distributed generation
Black-out
intentional islanding
Particle Swarm Optimization
Amany
El-Zonkoly
1
Arab Academy for Science & Technology., Faculty of Engineering & Tech., Miami., Alexandria., Egypt., P.O.1029
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ORIGINAL_ARTICLE
Two-Level PI Controller Design for Interconnected Power System Using Eigenvalues Assignment Technique.
The paper presents two different schemes to design controllers for interconnected power systems. The first scheme adopts two-level control concept, where the “lower” first level design is based on optimizing the decoupled subsystems, then eigenstructure (eigenvalues and partial eigenvalues) assignment approach is adopted to design the “higher” second level controller. The proposed two-level control preserves the autonomy of subsystems for sharing the assignment process, and suits power system stabilizers design. The proposed scheme can achieve robustness via eigenvector selection. The proposed second scheme proposes a proportional plus integral controller which is commonly used for load frequency control. The design procedure is based also on eigenvalues assignment. Two illustrative numerical examples are presented to prove the effectiveness of the procedure where the results indicate that the proposed control scheme works well.
https://bfemu.journals.ekb.eg/article_122352_519f40c7e1620cb8ae4bdf1eb0af4746.pdf
2020-11-09
79
87
10.21608/bfemu.2020.122352
Load frequency control (LFC)
Multi level control
Eigenvectors
Shady
El-Kashlan
shosh97@mail.com
1
Electrical & Control Engineering Department., Arab Academy for Science., Technology & Maritime Transport (AASTMT) P.O Box 1029 Abu-Quir., Alexandria., Egypt.
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