MAXIMUM TORQUE / AMPERE OF POSITION SENSORLESS CONTROL OF SYNCHRONOUS RELUCTANCE MOTOR
Z.M.S.
Elbarbary
Faculty of Engineering - KFS University
author
text
article
2017
eng
This paper introduced maximum torque per ampere of position sensorless control of Three-phase synchronous reluctance motor drive system. The proposed system is based on indirect rotor field oriented control . The rotor position is estimated using the active flux observer method . The drive system is investigated at different operating conditions. The proposed system is robust and suitable for high performance three-phase synchronous reluctance motor drives. Simulation is carried out by using the Matlab/Simulink package. The results validate the proposed approaches.
ERJ. Engineering Research Journal
Menoufia University, Faculty of Engineering
1110-1180
40
v.
1
no.
2017
1
7
https://erjm.journals.ekb.eg/article_66326_758f56ee9708a3a69bf1c11043f27ee8.pdf
dx.doi.org/10.21608/erjm.2017.66326
PERFORMANCE ANALYSIS OF INDIRECT ROTOR FIELD ORIENTATED CONTROL FOR FIVE PHASE INDUCTION MOTOR DRIVE
Mahmoud M.
Elkholy
Electrical Power and Machines Department, Faculty of Engineering, Zagazig University,
Zagazig, Egypt
author
Zakaria M.S.
Elbarbary
Department of Electrical Engineering, Faculty of Engineering, Kafrelsheikh University, EGYPT
Electrical Engineering Department, Faculty of Engineering, King Khalid University, Abha, Saudi
Arabia
author
text
article
2017
eng
This paper proposes a new topology of five-phase inverter with reduced number of switches fed coil with indirect rotor field oriented five-phase induction motor. It employs only eight IGBT switches performing a five-phase inverter. The reduction of the number of power switches from ten to eight reduces the cost, volume-compactness and reliability of five-phase induction motor drive systems. Simulation of the proposed drive system is developed using the Matlab/Simulink package and the results are analyzed to verify the effectiveness at different operating conditions. Comparison between performance of the five-phase induction motor under classical ten-switch inverter and the new topology, at the same operation conditions, has been illustrated. The proposed system gives similar operations as the classical ten-switch inverter for a certain range of motor speed and load torque. The DC voltage of the proposed inverter must be compensated to a higher value for achieving the same performance of classical ten-switch inverter in all ranges of motor speed and load torque.
ERJ. Engineering Research Journal
Menoufia University, Faculty of Engineering
1110-1180
40
v.
1
no.
2017
9
18
https://erjm.journals.ekb.eg/article_66327_b7ebf8e6c781a456f96590fc3127461f.pdf
dx.doi.org/10.21608/erjm.2017.66327
MODELING OF A SORAR LITHIUM BRMMIDE-WATER ABSORPTION AIR CONDITIONER IN BEIRUT
M. Gad
El-Rab
Mechanical Engineering Department, School of Engineering, Lebanese International
University LIU, Beirut, Lebanon
author
M.
Khaled
Mechanical Power Engineering Department, Faculty of Engineering, Minoufyia University,
Shebin El-kom, Egypt
author
M.
Ramadan
Mechanical Engineering Department, School of Engineering, Lebanese International
University LIU, Beirut, Lebanon
author
A.
Al Hassanieh
Mechanical Engineering Department, School of Engineering, Lebanese International
University LIU, Beirut, Lebanon
author
text
article
2017
eng
A Single-stage lithium bromide absorption chiller driven by solar water heater is investigated in this paper. In the recent study, system description, modeling and simulation are introduced for LiBr-H2O absorption air conditioning system. This system has been proposed for an apartment has about 30 kW cooling load. It is found that the obtained COP can reach up to 0.9 at absorber temperature 30°C and generator temperature around 70°C which can be obtained from an evacuated tube solar collector
ERJ. Engineering Research Journal
Menoufia University, Faculty of Engineering
1110-1180
40
v.
1
no.
2017
19
24
https://erjm.journals.ekb.eg/article_66328_917af08ce09e763dee852899d50ad8aa.pdf
dx.doi.org/10.21608/erjm.2017.66328
COOLING PHOTOVOLTAIC CELLS USING PHASE CHANGE MATERIALS – EXPERIMENTS AND ECONOMICAL STUDY
M.
Khaled
Mechanical Engineering Department, School of Engineering, Lebanese International
University LIU, Beirut, Lebanon
author
F.
Hachem
Mechanical Engineering Department, School of Engineering, Lebanese International
University LIU, Beirut, Lebanon
author
Gad
El-Rab
Mechanical Engineering Department, School of Engineering, Lebanese International
University LIU, Beirut, Lebanon/Mechanical Engineering Department, School of Engineering, Lebanese International
University LIU, Beirut, Lebanon
author
M.
Ramadan
Mechanical Engineering Department, School of Engineering, Lebanese International
University LIU, Beirut, Lebanon
author
text
article
2017
eng
This work concerns an experimental study of the effect of Phase Change Materials PCM on the thermal behavior and electrical performance of a Photovoltaic PV panel. To proceed, an appropriate experimental setup is devised and two prototypes constructed and tested. Prototype 1 corresponds to a reference case and consists of a stand, a PV panel, and an electrical circuit with a given load. Prototype 2 corresponds to an enhanced case of prototype 1 with in addition a container at the rear face of the PV panel that holds PCM. It was shown that the use of PCM can increase the electrical efficiency of PV panels by an average of 5%.
ERJ. Engineering Research Journal
Menoufia University, Faculty of Engineering
1110-1180
40
v.
1
no.
2017
25
29
https://erjm.journals.ekb.eg/article_66329_3a9a6a4aea2efcb23a9bec578b9289a9.pdf
dx.doi.org/10.21608/erjm.2017.66329
CAVITATION EROSION DAMAGE IN DIESEL ENGINES WET CYLINDER LINERS
M. A.
Hosien
Mechanical Power Engineering Department, Faculty of Engineering, Menoufyia University,
Shebin El-Kom, Egypt
author
S. M.
Selim
Mechanical Power Engineering Department, Faculty of Engineering, Menoufyia University,
Shebin El-Kom, Egypt
author
text
article
2017
eng
An experimental investigation was conducted using vibratory device in order to obtain the effects of the vibration amplitude, pressure, temperature of water and depth of water on the cavitation erosion damage in wet diesel cylinder liners composed of 99 percent pure aluminum. Data indicated that as the depth of water decreases and the temperature increased, the weight loss rate increased, reached a maximum, and then decreased again. In addition, the weight loss rate increased linearly with increasing suppression pressure. Results suggest that the designer should design the engine with large gap between the cylinder liner and the jacket, the value of the cooling liquid temperature should be outside the peak erosion range and high cooling water pressure must be prevented to avoid serious erosion. Light optical photomicrographs of the damaged areas on the test specimen surfaces documents the nature of erosion damage corresponding to various test conditions.
ERJ. Engineering Research Journal
Menoufia University, Faculty of Engineering
1110-1180
40
v.
1
no.
2017
31
36
https://erjm.journals.ekb.eg/article_66330_57aba7383017959b7871ef202b7fdd6b.pdf
dx.doi.org/10.21608/erjm.2017.66330
INCEPTION OF CAVITATION BUBBLES IN DIESEL ENGINES WET CYLINDER LINERS
M. A.
Hosien
Mechanical Power Engineering Department, Faculty of Engineering, Menoufyia
University, Shebin El-Kom, Egypt
author
S. M.
Selim
Mechanical Power Engineering Department, Faculty of Engineering, Menoufyia
University, Shebin El-Kom, Egypt
author
text
article
2017
eng
An experimental investigation was conducted using vibratory device in order to obtain the effects of the vibration frequency, static pressure, water temperature and depth of water between the liner and the water jacket on the initiation of cavitation bubbles. The initiation of cavitation bubbles was determined visually by naked eye with the help of stroboscopic lighting. The results indicated that the initiation of cavitation bubbles decreased with increasing vibration frequency and water temperature. In addition, cavitation bubbles initiation increased as the depth of water increased. The results also showed that the initiation of cavitation bubbles was independent of the static pressure. Results suggest that the designer should design the engine with cylinder liner vibration amplitude less than the critical vibration amplitude for initiation of cavitation bubbles to avoid the occurrence of cavitation. The results of cavitation bubbles initiation measurements were compared with a proposed cavitation inception model and good agreement was obtained.
ERJ. Engineering Research Journal
Menoufia University, Faculty of Engineering
1110-1180
40
v.
1
no.
2017
37
45
https://erjm.journals.ekb.eg/article_66331_22fe456295ca65fe070ff7a429dd562e.pdf
dx.doi.org/10.21608/erjm.2017.66331
REPAIR AND STRENGTHENING OF RC SLABS USING FERROCEMENT LAYERS REINFORCED WITH DIFFERENT FRP MESHES
Ahmed M.
Ramadan
Lecturer, Civil Engineering Department, Tanta Higher Institute of Engineering and Technology
author
text
article
2017
eng
Ferrocement is one of the recent methods for repair and strengthening of reinforced concrete members. It can be described as a type of thin composite material made of cement mortar reinforced with wire meshes. The wire meshes are uniformly distributed in continuous layers with relatively small diameters. In this research, an experimental test program consists of eleven RC slab specimens repaired and strengthened by ferrocement layers reinforced by traditional steel reinforcement and steel wire meshes as well as manufactured glass and carbon fiber reinforced polymer meshes. The tested slabs classified in three groups. The first group consists of three specimens as reference slabs. The second group for repaired slabs consists of four specimens. They were loaded first by 80% of the ultimate loads and then cracks were repaired and then additional ferrocement layers with different wire meshes were added. The third group for strengthened slabs consists of four specimens. They were strengthened with additional ferrocement layers with different wire meshes without preloading. Slab specimens were tested under two-point loading and subjected to incremental loads till failure. Performance of the tested slabs such as deflections, cracking and ultimate loads as well as crack patterns were investigated, analyzed and discussed in this research. The test results confirm that repair and strengthening technique using ferrocement layers gives good results. Intertwined manufactured carbon fiber wire mesh gave best results for increasing the flexural capacity of RC slabs.
ERJ. Engineering Research Journal
Menoufia University, Faculty of Engineering
1110-1180
40
v.
1
no.
2017
47
57
https://erjm.journals.ekb.eg/article_66332_624b073c52af981c10251d0cfdd6cd1b.pdf
dx.doi.org/10.21608/erjm.2017.66332
COMPARATIVE STUDY FOR USING LIME AND CEMENT KILN DUST FOR MUNICIPAL SLUDGE TREATMENT.
Hazem I.
Saleh
Civil Engineering Department, Faculty of Engineering, Menoufia University, Egypt
author
Magdy A.
Zahran
Chemistry Department, Faculty of Science, Menoufia University, Egypt
author
Amal A.
Nasser
Civil Engineering Department, Faculty of Engineering, Menoufia University, Egypt
author
Eman M.
Elsehaity
Civil Engineering Department, Faculty of Engineering, Menoufia University, Egypt
author
text
article
2017
eng
Municipal Sludge Treatment is a first priority issue in high populated countries like Egypt. Building materials properties were employed in treating sewage sludge. Adding water to cement and lime creates alkaline media, which raises pH of sludge for certain period of time. High pH ensures getting rid of pathogens in the treated sludge. Unlike industrial wastes, Cement Kiln Dust is similar to Cement composition with less specification. An investigation of several alkaline building materials was conducted to compare the influence of mixing them with sewage sludge. Using by-product Cement Kiln Dust proved to be effective and was lime competitive. Fresh collected Cement Kiln Dust has a larger potential in raising pH than that of stored one. Cement Kiln Dust as well as lime achieved Class B specifications. Using Cement Kiln Dust proved to be effective and cheap treatment of Municipal Sludge
ERJ. Engineering Research Journal
Menoufia University, Faculty of Engineering
1110-1180
40
v.
1
no.
2017
59
64
https://erjm.journals.ekb.eg/article_66333_5678bc5cc8da7965955b3f2559e6dea7.pdf
dx.doi.org/10.21608/erjm.2017.66333
Light Weight Self Compacting Concrete With Light Expanded Clay Aggregate (LECA)
Khaled M.
Heiza
Professor of Reinforced Concrete Structures and bridges , Faculty of Engineering, Menoufia University,
Egypt
author
Fatma M.
Eid
Lecturer, Civil Engineering Department, Faculty of Engineering, Menoufia University, Egypt.
author
Taha
Masoud
Master student ,Civil Engineering Department, Faculty of Engineering, Menoufia University, Egypt
author
text
article
2017
eng
Lightweight concretes have been successfully applied in the building constructions for decades because of their favourable material properties, especially their low specific weight in connection with a high strength, a high capacity of thermal insulation and a high durability. The development leading to light weight self compacting concrete(LWSCC) represents an important innovative step in the recent years. This concrete combines the favourable properties of a lightweight concrete with those of a self compacting concrete. Research work is aimed on development of (LWSCC) with the use of light aggregates ‖Light expand clay aggregate (LECA)‖. In this investigation, first by specific gravity factor method, Twenty different mixes design of (LWSCC) were casted and tested to find out the values of slump flow, G-ring , V-funnel and 28 day compressive strength. Based on the results obtained, the best mix design was selected for further investigation. For the selected mix we study the effect of changing the reinforcement ratio on reinforced two way slabs when the dimensions were kept constant.
ERJ. Engineering Research Journal
Menoufia University, Faculty of Engineering
1110-1180
40
v.
1
no.
2017
65
71
https://erjm.journals.ekb.eg/article_66334_293d995eca44bd36ef856e4f71d5ada3.pdf
dx.doi.org/10.21608/erjm.2017.66334
تطوير الواجهات المائية کمدخل للارتقاء بالبيئة العمرانية لمدن الدلتا
فيصل عبد المقدصود
عبد السلام
کلية الهندسة - جامعة المنوفية
author
أسماء مصطفي
الشامي
کلية الهندسة - جامعة المنوفية
author
شيماء عبد الواحد
شوان
author
text
article
2017
eng
تعتبر المجاري المائية عنصر هام وفاعل رئيسي في نشاة المستقرات البشرية، وقد ازدهرت الحضارات العظيمة والمدن القديمة والموانئ علي حدود المسطحات المائية خاصة الانهار، وتشکل الانهار والبحيرات مسطحات مائية داخل نسيج المدن مشهد ومنظر طبيعي، ونقاط جذب لجمهور المنتفعين والسکان بما تقدمه من مناظر خلابة ونشاطات ترفيهية واجتماعية وترويحية ورياضية. تتمثل المشکلة البحثية في انه بالرغم من وجود عدد کبير من المدن في مصر وخاصة في الدلتا تتمتع بواجهات مائية علي نهر النيل الا ان هذه الواجهات ليس لها دور في تنمية وتطوير المدينة، مما اثر بالسلب على التشکيل العمرانى للواجهات المائية وعدم الاستفادة من هذة القيمة الموجودة فى المدن . يهدف البحث الي رصد الاوضاع الراهنة للواجهات المائية للمدن في دلتا مصر لتحديد المشکلات التي تواجه نطاقات تلک الواجهات، والارتقاء بالتشکيل العمراني لتلک النطاقات وتوظيفها في اثراء الصورة البصرية للمدينة. وصولا الي الهدف السابق، فان البحث يتناول بالدراسة المحاور التالية: تعريف الواجهات المائية ونطاقاتها المکانية، انظمة التقييم البيئي، مبادئ استدامة الواجهات المائية، النطاق الاقليمي للدراسة الميدانية، دراسة حالة لعينة من المدن المصرية للتعرف علي اهم الملامح والسمات العمرانية العامة والمشاکل التي تواجه تلک النطاقات، اسس تطوير الواجهات المائية في مدن الدلتا.
ERJ. Engineering Research Journal
Menoufia University, Faculty of Engineering
1110-1180
40
v.
1
no.
2017
73
79
https://erjm.journals.ekb.eg/article_66335_46eda43ab7fbf584fa0cc21198071970.pdf
dx.doi.org/10.21608/erjm.2017.66335