@article { author = {Elbarbary, Z.M.S.}, title = {MAXIMUM TORQUE / AMPERE OF POSITION SENSORLESS CONTROL OF SYNCHRONOUS RELUCTANCE MOTOR}, journal = {ERJ. Engineering Research Journal}, volume = {40}, number = {1}, pages = {1-7}, year = {2017}, publisher = {Menoufia University, Faculty of Engineering}, issn = {1110-1180}, eissn = {}, doi = {10.21608/erjm.2017.66326}, abstract = {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.}, keywords = {Synchronous reluctance motor,position sensorless control,Field oriented control}, url = {https://erjm.journals.ekb.eg/article_66326.html}, eprint = {https://erjm.journals.ekb.eg/article_66326_758f56ee9708a3a69bf1c11043f27ee8.pdf} } @article { author = {Elkholy, Mahmoud M. and Elbarbary, Zakaria M.S.}, title = {PERFORMANCE ANALYSIS OF INDIRECT ROTOR FIELD ORIENTATED CONTROL FOR FIVE PHASE INDUCTION MOTOR DRIVE}, journal = {ERJ. Engineering Research Journal}, volume = {40}, number = {1}, pages = {9-18}, year = {2017}, publisher = {Menoufia University, Faculty of Engineering}, issn = {1110-1180}, eissn = {}, doi = {10.21608/erjm.2017.66327}, abstract = {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.}, keywords = {Five phase induction motor,Field oriented control,Ten-switch inverter,Eight-switch inverter}, url = {https://erjm.journals.ekb.eg/article_66327.html}, eprint = {https://erjm.journals.ekb.eg/article_66327_b7ebf8e6c781a456f96590fc3127461f.pdf} } @article { author = {El-Rab, M. Gad and Khaled, M. and Ramadan, M. and Al Hassanieh, A.}, title = {MODELING OF A SORAR LITHIUM BRMMIDE-WATER ABSORPTION AIR CONDITIONER IN BEIRUT}, journal = {ERJ. Engineering Research Journal}, volume = {40}, number = {1}, pages = {19-24}, year = {2017}, publisher = {Menoufia University, Faculty of Engineering}, issn = {1110-1180}, eissn = {}, doi = {10.21608/erjm.2017.66328}, abstract = {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}, keywords = {Solar heat source,absorption chillers,low-grade temperature,refrigeration and air conditioning}, url = {https://erjm.journals.ekb.eg/article_66328.html}, eprint = {https://erjm.journals.ekb.eg/article_66328_917af08ce09e763dee852899d50ad8aa.pdf} } @article { author = {Khaled, M. and Hachem, F. and El-Rab, Gad and Ramadan, M.}, title = {COOLING PHOTOVOLTAIC CELLS USING PHASE CHANGE MATERIALS – EXPERIMENTS AND ECONOMICAL STUDY}, journal = {ERJ. Engineering Research Journal}, volume = {40}, number = {1}, pages = {25-29}, year = {2017}, publisher = {Menoufia University, Faculty of Engineering}, issn = {1110-1180}, eissn = {}, doi = {10.21608/erjm.2017.66329}, abstract = {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%.}, keywords = {PV Cell,PCM,Cooling,Efficiency,Experimental Setup}, url = {https://erjm.journals.ekb.eg/article_66329.html}, eprint = {https://erjm.journals.ekb.eg/article_66329_3a9a6a4aea2efcb23a9bec578b9289a9.pdf} } @article { author = {Hosien, M. A. and Selim, S. M.}, title = {CAVITATION EROSION DAMAGE IN DIESEL ENGINES WET CYLINDER LINERS}, journal = {ERJ. Engineering Research Journal}, volume = {40}, number = {1}, pages = {31-36}, year = {2017}, publisher = {Menoufia University, Faculty of Engineering}, issn = {1110-1180}, eissn = {}, doi = {10.21608/erjm.2017.66330}, abstract = {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.}, keywords = {Cavitation,Erosion,Diesel Engine,cylinder liner}, url = {https://erjm.journals.ekb.eg/article_66330.html}, eprint = {https://erjm.journals.ekb.eg/article_66330_57aba7383017959b7871ef202b7fdd6b.pdf} } @article { author = {Hosien, M. A. and Selim, S. M.}, title = {INCEPTION OF CAVITATION BUBBLES IN DIESEL ENGINES WET CYLINDER LINERS}, journal = {ERJ. Engineering Research Journal}, volume = {40}, number = {1}, pages = {37-45}, year = {2017}, publisher = {Menoufia University, Faculty of Engineering}, issn = {1110-1180}, eissn = {}, doi = {10.21608/erjm.2017.66331}, abstract = {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.}, keywords = {Cavitation,inception,Vibration,cylinder liner}, url = {https://erjm.journals.ekb.eg/article_66331.html}, eprint = {https://erjm.journals.ekb.eg/article_66331_22fe456295ca65fe070ff7a429dd562e.pdf} } @article { author = {Ramadan, Ahmed M.}, title = {REPAIR AND STRENGTHENING OF RC SLABS USING FERROCEMENT LAYERS REINFORCED WITH DIFFERENT FRP MESHES}, journal = {ERJ. Engineering Research Journal}, volume = {40}, number = {1}, pages = {47-57}, year = {2017}, publisher = {Menoufia University, Faculty of Engineering}, issn = {1110-1180}, eissn = {}, doi = {10.21608/erjm.2017.66332}, abstract = {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.}, keywords = {RC slab,strengthening,ferrocement,Steel reinforcement,carbon fibers,Glass Fibers}, url = {https://erjm.journals.ekb.eg/article_66332.html}, eprint = {https://erjm.journals.ekb.eg/article_66332_624b073c52af981c10251d0cfdd6cd1b.pdf} } @article { author = {Saleh, Hazem I. and Zahran, Magdy A. and Nasser, Amal A. and Elsehaity, Eman M.}, title = {COMPARATIVE STUDY FOR USING LIME AND CEMENT KILN DUST FOR MUNICIPAL SLUDGE TREATMENT.}, journal = {ERJ. Engineering Research Journal}, volume = {40}, number = {1}, pages = {59-64}, year = {2017}, publisher = {Menoufia University, Faculty of Engineering}, issn = {1110-1180}, eissn = {}, doi = {10.21608/erjm.2017.66333}, abstract = {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}, keywords = {Cement kiln dust,Lime, Municipal Sludge,Wastewater treatment,Sludge Pathogens,Sludge Parasites}, url = {https://erjm.journals.ekb.eg/article_66333.html}, eprint = {https://erjm.journals.ekb.eg/article_66333_5678bc5cc8da7965955b3f2559e6dea7.pdf} } @article { author = {Heiza, Khaled M. and Eid, Fatma M. and Masoud, Taha}, title = {Light Weight Self Compacting Concrete With Light Expanded Clay Aggregate (LECA)}, journal = {ERJ. Engineering Research Journal}, volume = {40}, number = {1}, pages = {65-71}, year = {2017}, publisher = {Menoufia University, Faculty of Engineering}, issn = {1110-1180}, eissn = {}, doi = {10.21608/erjm.2017.66334}, abstract = {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.}, keywords = {LECA,light weight self-compacting concrete,Reinforcement ratio,two way slabs}, url = {https://erjm.journals.ekb.eg/article_66334.html}, eprint = {https://erjm.journals.ekb.eg/article_66334_293d995eca44bd36ef856e4f71d5ada3.pdf} } @article { author = {عبد السلام, فيصل عبد المقدصود and الشامي, أسماء مصطفي and شوان, شيماء عبد الواحد}, title = {تطوير الواجهات المائية کمدخل للارتقاء بالبيئة العمرانية لمدن الدلتا}, journal = {ERJ. Engineering Research Journal}, volume = {40}, number = {1}, pages = {73-79}, year = {2017}, publisher = {Menoufia University, Faculty of Engineering}, issn = {1110-1180}, eissn = {}, doi = {10.21608/erjm.2017.66335}, abstract = {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.}, keywords = {}, url = {https://erjm.journals.ekb.eg/article_66335.html}, eprint = {https://erjm.journals.ekb.eg/article_66335_46eda43ab7fbf584fa0cc21198071970.pdf} }