Mansoura University, Faculty of Engineering
MEJ- Mansoura Engineering Journal
1110-0923
33
1
2008
03
01
Proposed Technique that Simulates the Actual Asphalt Mix Field Compaction.
1
13
126802
10.21608/bfemu.2008.126802
EN
Ahmed
Mohamady
Assistant Professor., Construction Engineering and Utilities Department., Faculty of Engineering., Zagazig University., Egypt.
Journal Article
2008
01
11
<strong>Future needs and challenges in the asphalt concrete industry should make use of developed and new techniques to attain the best field performance. Spreading and compacting fresh asphalt concrete mix is a ver<em>y </em>important job during pavement construction. The compaction mechanism in the field greatly affects the pavement characteristics, performance, and service life. Several studies tried to use different compaction techniques to simulate the actual field compaction in the laboratory. The purpose of this study aims at introducing an innovative compaction technique that simulates the actual field compaction conditions to a great extent as presented in the research results. The technique employs the traditional Marshall-CBR testing machine in compacting the asphalt mixes, A steel disc is placed over the sample, which is continuously compressed in the Marshall mould till reaching the required the traditional Marshall and the proposed sample dimensions. Results obtained from compaction techniques are compared with field results. Analysis of the results showed large coincidence between the proposed compaction technique and the field results. On the other hand, specimens compacted using the traditional Marshall technique showed larger deviation with the field results in almost all the tested properties.</strong>
Mansoura University, Faculty of Engineering
MEJ- Mansoura Engineering Journal
1110-0923
33
1
2021
12
01
Recommender System for E-Research.
1
10
209232
10.21608/bfemu.2021.209232
EN
A.
M. Riad
Head of Information System Department, Faculty of Computers and Information Sciences, Mansoura University, Mansoura, Egypt
Hamdy K.
Elminir
National Research Institute of Astronomy of Solar and Space Research, El-marsad Street P.O. box 11421 Helwan, Cairo, Egypt.
Sahar F.
Sabbeh
Alzarka Higher institute for administration & computer sciences
Journal Article
2008
01
01
<strong>The typical architecture of the recommender systems consists of two components performed offline and online with respect to the Web server activity. The offline component includes the Preprocessing and Pattern Discovery phases, while the online one implements the Pattern Analysis phase to generate recommendations such as links to pages, advertisements, or information relating to products or services estimated to be of interest for the current user.</strong><br /> <strong>This paper presents an online web-based recommender system that collapses the offline and online modules of the typical recommender system into a single module. The proposed system can adapt itself not only to its users, but also to the open Web having the ability to find relevant content on the web. Also, it has the ability to personalize and adapt this content based on the system's observation of its learners. Although learners do not have direct interaction with the open Web, the system can retrieve relevant papers from a paper from a paper list database on remote site such as cite seer or Google Scholar so that, the system can adapt to the open web as well as adapting itself to its users.</strong>
Mansoura University, Faculty of Engineering
MEJ- Mansoura Engineering Journal
1110-0923
33
1
2020
12
01
Control Scheme for a Grid Connected Permanent Magnet Synchronous Generator Driven Wind Turbine.
11
18
126804
10.21608/bfemu.2020.126804
EN
Mohamed El-Sayed
Mohamed
Associate Professor., IEEE. Member Electrical Engineering Department., Mansoura University., Mansoura., Egypt.
Journal Article
2008
01
01
<strong>Direct coupling of Wind Turbine WT becomes feasible with modern Permanent Magnet Synchronous Generators PMSG. This paper presents a sensorless Maximum Power Point Tracker MPPT for a grid connected PMSG direct driven fixed pitch WT. The MPPT objectives are: to track the maximum output power form the WT and to guarantee efficient operation of PNISG. A new and simple rotor position, speed and motor flux magnitude estimator based on the PMSG model is proposed. The estimator evades using the stator current derivatives calculation, which is an Inherent drawback of the buck-EMF based estimators, The PMSG estimated speed is led to the MPPT to calculate the reference stator currents. A field weakening algorithm is also designed to widen the operating speed range of the PMSG. The sensltivity of the proposed sensorless MPPT 1o PMSG parameters mismatch is investigated and studied. Finally, the control scheme is tested and investigated under various operating conditions and demonstrated excellent steady state and dynamic performance.</strong>
Mansoura University, Faculty of Engineering
MEJ- Mansoura Engineering Journal
1110-0923
33
1
2020
12
01
Improving TCP Performance over Mobile Ad Hoc Networks with an Adaptive Backoff and Response Approach.
19
27
126808
10.21608/bfemu.2020.126808
EN
Tamer
Ghanem
Instructor., Information Technology Department., Faculty of Computers and Information., Menoufia University., Shebin El-Kom., Egypt.
Wail
Elkilani
Assistant Professor., Information Technology Department., Faculty of Computers and Information., Menuofia Unjversity., Shebin El-Kom., Egypt.
Mohiy
Hadhood
Vicc dean of Faculty of Computers and Information., Menoufia University., Shebin El-Kom., Egypt.
Journal Article
2008
01
19
<strong>In a Mobile Ad Hoc Netw<em>or</em>k <em>(MANET), t</em>emporary link failures and <em>r</em>oute changes happen frequently. With the assumption that all packet losses are due to congestion, TCP performs poorly in such an environment. Most of the research performed for improving TCP performance over M<em>ANET </em>requires feedback from the network or the lower layer. Moreover, several attempts have been proposed for a layered TCP improvement. Yet, their percentage enhancements are not satisfactory. In this paper, we explore a new approach to improve TCP performance. This approach depends on beginning transmission as soon as route reestablishment is done after route failure. To do this we propose an adaptive backoff strategy with decreasing congestion window and slow start threshold values when we receive acknowled<span style="text-decoration: underline;">g</span>ement from the receiver. The simulation results showed that this approach had achieved an average performance improvement of 17%. Moreover, the proposed technique does not require feedback from the network or the lower layers. </strong>
Mansoura University, Faculty of Engineering
MEJ- Mansoura Engineering Journal
1110-0923
33
1
2020
12
01
Evaluation of Tool Wear Behavior when Laser Assisted Turning of Die Steel Using Nd: Yag Pulsed Laser.
1
8
126822
10.21608/bfemu.2020.126822
EN
A.
Kohail
Associate Professor., Mechanical Power Engineering ., Production Engineering Department., (R), MTC., Cairo.
Journal Article
2008
01
11
<strong>Laser assisted machining represents a new step towards a promising technique for machining new materials that are difficult to machine. Conventional cutting of such materials is accompanied by excessive tool wear, high cutting forces and poor surface finish. Laser-assisted turning (LAT) offers the local heating of the workpiece before conventional cutting takes place which means improving the ability of those materials to be cut more efficiently and economically. Die steel is an important example of these materials. </strong><br /> <strong>In this work laser assisted turning of Die steel DIN 1.2379 is investigated. Nd:Yag pulsed laser head of 400 W power is used to assist the conventional turning operation. For process evaluation, a comparison between conventional and laser assisted turning(LAT) was introduced considering tool life and surface roughness. The influences of variable cutting speed, depth of cut and laser power were discussed. The experiment<em>a</em>l results showed a considerable increase of tool life as well as a reduced influence on roughness height when using LATat higher speeds. </strong>
Mansoura University, Faculty of Engineering
MEJ- Mansoura Engineering Journal
1110-0923
33
1
2020
12
01
Investigation of Rotating Disk Skimmer Hydrodynamic Performance during Oil Spills Recovery.
9
28
126826
10.21608/bfemu.2020.126826
EN
A.
El-Zahaby
Mechanical Power Engineering Department., Faculty of Engineering., Tania University., Tanta 31521., Egypt.
A. E.
Kabeel
Mechanical Power Engineering Department., Faculty of Engineering., Tanta University., Tanta 31521., Egypt.
A. I.
Bakry
Mechanical Power Engineering Department., Faculty of Engineering., Tanta University., Tanta 31521., Egypt.
A. M.
Khaira
Mechanical Power Engineering Department., Faculty of Engineering., TanTa University., Tanta 31521., Egypt.
Journal Article
2008
01
11
<strong>Due to the great importance of disk skimmers in fighting oil spills, an integrated and comprehensive research program has been devoted intending towards understanding the hydrodynamic behavior, the physics standing behind, and the main features of disk skimmers during the process of oil recovery from water. </strong><br /> <strong>In order to achieve the task, extensive parametric experimental investigation has been carried out on disk skimmers rotating in a vertical plane to the oil-water surface. It has been accomplished for a wide range of disk design and operating parameters such as disk diameter, disk thickness, disk rotational speed, disk center height above oil-water interface, spilled oil film thickness, and oil type to study their influence on the oil recovery rate (ORR) and the oil recovery efficiency (ORE). Here, both are entirely expressed as a function of the disk rotational speed and appropriately used as an indicating measure of the performance. In fact, the present work is focused on evaluating ORE, as well as ORR which is the almost only performance parameter reported by other investigators, as an important parameter in defining the quality of the recovered oil which plays a significant role in deciding the nature of the handling processes next to the skimming process. In addition, an optical observation study has been performed to help in the interpretation and illustration of the various behaviors and trends appeared on the results f<span style="text-decoration: underline;">i</span>gures encountered in the parametric study, wherever a considerable amount of consistency and matching between the two are recognized. Generally, the results revealed reliable good agreement with that obtained previously by other investigators. An optimum disk rotational speed value, which almost depends on the spilled oil film thickness, was noticed where ORR reaches its maximum at an appropriate value of ORE. Any further increase of speed results in a reduction in both. In addition, the results clearly experienced that while an increase in the disk diameter improves ORR, and decreases ORE. However, the inverse was shown for increasing the disk center height above the oil-water interface or the disk thickness. Finally, the increases in either the spilled oil viscosity or the spilled oil film thickness enhance both ORR and ORE. </strong><strong><br /></strong>
Mansoura University, Faculty of Engineering
MEJ- Mansoura Engineering Journal
1110-0923
33
1
2020
12
01
Panel Flutter Control at High Supersonic Speed Using Piezoelectric Material.
29
40
126833
10.21608/bfemu.2020.126833
EN
S. A.
Abou-Amer
Vice Dean of AHI for management & Informatics
Journal Article
2008
01
11
<strong>Exterior panels forming the skin of flight vehicles traveling through the atmosphere at high supersonic speed are often susceptible to the occurrence of limit-cycle type self excited vibrations called flutter. The development of methods for panel flutter control is desirable and it is the objective of this work by using piezoelectric materials. The nonlinear equations of motion for panel flutter using <em>V</em>on-Karman's large deflection plate theory and the quasi-steady aerodynamic theory are modified to consider the composite plate with the piezoelectric layer. The composite plate consists of two piezoelectric layers bonded perfectly to the upper and lower surface of the original panel layer. When a voltage is applied to the piezoelectric layers, an induced strain in the plate material takes place and consequently tensile in-plane load is obtained. These tensile loads shift the onset of flutter point to about twice the value of the critical dynamic pressure for the plate alone. </strong><br /> <strong>The values of control voltage and the effect of piezoelectric material properties are invest<span style="text-decoration: underline;">i</span>gated. The method gives good results and succeeds in suppressing the panel flutter at its operating condition. </strong>
Mansoura University, Faculty of Engineering
MEJ- Mansoura Engineering Journal
1110-0923
33
1
2020
12
01
Damping Material for Stabilization of Panel Flutter at High Supersonic Speed.
41
53
126840
10.21608/bfemu.2020.126840
EN
S. A.
Abou-Amer
Vice Dean of AHI for management & Informatics.
Journal Article
2008
01
11
<strong>Exterior panels forming the exterior skin of flight vehicles traveling through the atmosphere at high supersonic speed are often susceptible to the occurrence of limit cycle type self- excited vibrations called flutter. The development of methods for the prevention and control of flutter, without adversely affecting the weight and cost, is desirable and it is the objective of this work by using damping materials. The nonlinear equations of motion for panel flutter using Von-Karman's farge deflection plate theory are modified to include damping material layers. At first, a viscoelastic damping layer is considered to be perfectly bonded to the surface of the plate to investigate the extension damping treatment. Secondly, the viscoelastic damping layer over the plate is constrained by a third layer called constrained layer to invest<span style="text-decoration: underline;">i</span>gate the shear damping treatment. The two types of damping treatment pr<em>o</em>ved to be able to prevent panel flutter successfully at prescribed operating conditions. But for the same panel weight, the constrained damping layer technique is more efficient than the free damping layer technique. </strong>
Mansoura University, Faculty of Engineering
MEJ- Mansoura Engineering Journal
1110-0923
33
1
2020
12
02
Fabrication of High Pours Ti-6A1-4Fe Alloy for Biomedical Application.
54
60
126966
10.21608/bfemu.2020.126966
EN
Montasser M.
Dewidar
Materials and Design Department., High Institute of Energy., South Valley University., Aswan., Egypt.
Jae Kyoo
Lim
Automobile Hi-Technology Research Institute, Chonbuk National University. Duckjin 1-664-14,
Jeonju, JB 561-756, South Korea.
Journal Article
2008
01
11
<strong>In the present study, Ti-6A1-4fe alloy was developed as a cost effective option to replace the traditional Ti-6Al4V alloy in the manufacture of surgical implants because of its larger biocompatibility (free vanadium). This alloy was prepared using the ball milling technique. Novel Ti 6Al-4fe alloy foams with porosity of approximately 70<em>% </em>were fabricated by a space-holder and powder metallurgical process. Irregular NaCl powders with particle size ranging from 100 to 600 um were used as a space holder material. The NaCl in the green compact was removed in hot distilled water at 70°C for times ranging from 1 to 5 h. The sintering process was performed in a vacuum furnace at 1250°C for 2 h. The T1-6A1-4Fe alloy foams displayed an interconnected porous structure resembling bone. The compressive stress and the Young's modulus of the Ti-6A1-4Fe foam were 38±514± <em>G</em>Pa and 10.42 GPa, respectively. Both the porous structure and the mechanical properties of the Ti-6Al-4Fe foam were very close to those of natural bone. </strong>
Mansoura University, Faculty of Engineering
MEJ- Mansoura Engineering Journal
1110-0923
33
1
2020
12
02
Selection of Optimal Cutting Condition for Wear, Friction and Lubricant using Hybrid Intelligent System.
61
67
126976
10.21608/bfemu.2020.126976
EN
N. A.
El-Hamshary
Production Engineering and Mechanical Design Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
Tawfik
El-Midany
Professor of Production Engineering and Mechanical Design Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
Ibrahim Mohamed Ibrahim Eliwa
Amar
Professor of Production Engineering and Mechanical Design Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
A. S.
Gad El-Mawla
Production Engineering and Mechanical Design Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
O.
B. Abouelatta
Professor of Production and Mechanical Design Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
Journal Article
2008
01
11
<strong>Surface technolo<span style="text-decoration: underline;">gy </span>provides an important and valuable insight into the practical and theoretical applications of a manufactured surface. Cutting conditions play an important role in assessment of functional performance for engineering surfaces. Also, there is an important relation between the surfaces geometry and the functional performance of the surface. The geometry of the surface has a large influences of the surface performance. Topography analysis is primarily concerned with describing a surface in terms of its features. Then the knowledge gained about the geometry of the surface is used to control the surface production process to predict the performance of the component in its functional environment. Roughness parameters which characterize machined surfaces affect on both culling conditions and functional performance. Previous researches introduced a relations between roughness parameters and functional performance of machined surfaces. In present study, three of the surface functional performance that are friction <em>,</em>wear, and lubrication which known as the tribological properties are concerned. A hybrid Artificial Neural Network <em>(</em>ANN) is used for selection of optimal cutting conditions. Experimental study is made to obtain the required parameters for the constructed ANN. The experimental study is made on 65 specimens free cutting steel 37, 40 mm in diameter. The specimens are divided into three groups, one of them is machined by turning operation. The second group is machined by milling operation. The third group is machined by grinding operation. All specimen are machined at various cutting conditions (feed, speed, depth of cut). All specimens are measured using Mitutoyo Surf Test SJ201 that give the surface profile and some of roughness parameters of the measured surface as a result. A developed Matlab programs <em>Sur/Test SJ201</em><em>P </em>and S<em>RC</em>P, are used to give a full assessment of surface roughness parameters from the resulted surface profile of the Mitutoyo SurfTest-S/201. An introduced neural network is modeled by computer programs written in Matlab®. Also, <em>O</em>SCC program made by Matlab© is developed for selection of optimal cutting conditions. The maximum difference between measured data and data obtained from introduced hybrid ANN is of ±0.25%.</strong>
Mansoura University, Faculty of Engineering
MEJ- Mansoura Engineering Journal
1110-0923
33
1
2020
12
02
Augmentation of Heat Transfer Characteristics for Flow through Circular Tube by Radial Guide Vane Swirl Generators.
68
77
126987
10.21608/bfemu.2020.126987
EN
Gamal Ibrahim
Sultan
Associate Professor., Mechanical Power Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
Journal Article
2008
01
11
<strong>The convective heat transfer coefficient for a uniform heat flux tube is improved experimentally by using a single twisted vanes turbulator. The effect of the twisted vane inserts on the heat transfer rate are studied experimentally. During this study, the operating parameters are Reynolds numbe<em>r (</em>274<em>7 </em>6390), and local position of the swirl} element (S/L=0.0, 0.25, 0.5, 0.75, 1.0). The results demonstrated that the use of twisted vane swirl element inserts leads to a higher heat transfer coefficient rather than that of plain tube and the swirl element p < em>osition of 0.25 from tested tube inlet yields a better heat transfer characteristics. The results are also correlated in the form of Nusselt number as a function of Reynolds number and turbulator position ratio. An augmentation of heat transfer coefficient up to 2<em>77% </em>is obtained.</strong>