Asian Transactions on Engineering
Volume: 02, Issue: 04, September 2012
Title: Study the Effect of Welding Joint Location on the Fatigue Strength and Fatigue Life for Steel Weldment
Author(s): Ali Sadiq Yasir
Paper ID: ATE-80212044
Pages: 1 - 13
Abstract: The welding process is one of the oldest joining processes between the materials, this paper try to find the effect of welding joint location in the steel on the fatigue strength of steel. The welding process done by electrical arc welding to joining steel samples at different locations at (X/L=0.25, X/L=0.5, and X/L=0.75), where (X) the location of welding zone centre and sample subjected to fully reversed bending stress, then comparing the fatigue test results with un-welded sample. The experimental results show that the welding joint decrease the tensile strength of steel and the fatigue failure strength also decreased specially for that with (X/L=0.5 and X/L=0.75) and failure occur at welding zone, but the sample with (X/L=0.25) had less effected by welding joint and the failure occur at the support not at welding zone. The results show fatigue life affected by the welding joint when draw (S-N) diagram for each sample especially for sample with (X/L=0.5 and X/L=0.75).
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Title: The Modelling , Simulation and Control of a 50 kW Vertical Axis Wind Turbine
Author(s): Bati A. F., Brennan F.
Paper ID: ATE-60211045
Pages: 14 - 23
Abstract: Abstract This paper presents the modelling, Simulation and control of the APP 50 kW vertical axis wind turbine generating unit which is designed and built by Cranfield University, Department of Offshore, Process & Energy Engineering. Because of the increasing interest of Power Distribution companies to connect medium sized wind turbines to reinforce the Low Carbon future 11 kV networks, unit exploration and investigation will add valuable insight into operation scenarios and their effects on the local network. The main objectives of this work are to model all elements, verify the design figures-, analyse the operational aspects of the drive-train and improve the quality of the generated power with respect to the converter, harmonic filter and controller.
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Title: Lossless DC-DC Boost Converter With High Voltage Gain For PV Technology
Author(s): Falah Al Hassan, Vladimir L. Lanin
Paper ID: ATE-10216041
Pages: 24 - 28
Abstract: Abstract- The demands of PV technology with high performance is very interesting alternative on supplement the electric system generation, due to the persistent cost reduction of the overall system a lot of works have been done during the design and implementation of high efficiency DC-DC converters applicable in PV. This paper proposes for improving the power-conversion efficiency and to obtain high voltage gain by reducing voltage stresses at a switch node of boost converter by using snubber cell which consists of inductors, capacitor, as well as diodes. In the proposed converter, two inductors with same level of inductance are charged in parallel during the switch -on period and are discharged in series during the switch-off period. Moreover the paper discusses the theoretical analyses in detail and present experimental result. Finally The improved boost converter topology was built in the laboratory to verify the performance with input voltage 15V to out 130 V and the typical operation frequency 30KHZ to get hold of efficiency between (90-94)%.
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Title: Effect of Humidity on the PV Performance in Oman
Author(s): Hussein A Kazem, Miqdam T Chaichan, Iman Mohammed Al-Shezawi, Hanan Saif Al-Saidi, Hanan Sulaiman Al-Rubkhi, Jamila Khamis Al-Sinani and Ali H A Al-Waeli
Paper ID: ATE-20215047
Pages: 29 - 32
Abstract: Abstract- This paper presents the effect of relative humidity on the performance of the Photovoltaic (PV). Three types of PV (Polycrystalline, Monocrystalline and Amorphous Silicon) have been tested to investigate the effect of humidity on the performance. PV system connected to measurements humidity, current and voltage. Results obtained show that the output current, voltage, and power increase with low relative humidity. The efficiency of the PV is high when the humidity low. Hence low relative humidity enhances the performance of PV systems.
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Title: Studio Teaching and Assessments; Defects and Holistic Solutions; Part One: Students Based Defects
Author(s): Usama H. Mohamed
Paper ID: ATE-40208049
Pages: 33 - 39
Abstract: Design studio is the core module in any degree program for Architecture; it is the main focal point of all the other modules in the whole program. It is very essential and extremely important to apply effective strategies and secure smooth flow for the teaching/learning process, to assure success and achieve the targeted highest valuable outcomes of the module and of the whole program as well. Assessments form a very essential and important complementary part of the process, with great impacts on all its different phases, as well as on the final results and outcomes. However, there are some noticeable defects in almost any design studio everywhere, some of which relate to the teaching/learning process itself, while others relate to its complementary part; the assessments. These defects badly shorten the spans and shrinkage the capabilities of the process strategies, and restrict its flow. Eventually, they obviously narrow the expectations and lower down the ceiling of the real outcomes of the process, module, and the program. This study takes into considerations some serious and impactful defects in studio teaching and assessments, based on the researcher's almost twenty years long experience of teaching and sharing in design studios in Egyptian, Japanese, and Malaysian universities and institutes. These defects will be categorized into their different related subjects; i.e. students, staff, facilities, course, program, and school/university. How these defects impact the strategies and flow of the teaching/learning process and the assessments complementary part will be analyzed and explained. This study is divided into three papers, as three parts; this paper is the first paper and the first part of the complete study. This paper represents the defects related to students; social based defects and technical based defects. Finally, some holistic solutions will be suggested, discussed, and evaluated. Such solutions will be categorized into the same categories of the defects, covering wide range of possibilities and practicalities, to be as much suitable as possible to be applied in different situations and environments.
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Title: Suitability assessment of groundwater around Tangratilla gas blowout affected area, NE Bangladesh
Author(s): Mohammed Omar Faruque
Paper ID: ATE-60204045
Pages: 40 - 50
Abstract: Ground water quality determination is vital to ensure sustainable safe use of water. In the present paper, an attempt has been made, for the first time in this region, to identify the factors which govern the groundwater quality. To this purpose, collected water samples were investigated with respect to PH, Electrical conductivity (EC), Turbidity, Total Alkalinity (TA), Calcium (Ca2+ ), Magnesium (Mg2+), Manganese (Mn2+), Iron(Fe2+), Suspended solids(SS), Dissolved solids(DS), Total Solids(TS), Total Hardness(TH), Chloride(Cl-) and sodium (Na+). The physicochemical results obtained were interpreted using statistical analysis (correlation matrix). This statistical analysis of data exhibits good and interesting correlation values lead to interpretation of the results. Evaluation of the samples for different uses such as drinking, domestic and irrigation purposes were obtained according to WHO standards and sodium adsorption ratio (SAR). Results of this study show that groundwater samples characterize by good quality for different uses.
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