Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : efficiency


Effect of Friction Stir Processing (FSP) to the Some Properties of Pure Copper Welded by Friction Stir Welding

Mais A. Abdulkareem

Engineering and Technology Journal, 2018, Volume 36, Issue 9A, Pages 985-990
DOI: 10.30684/etj.36.9A.7

Friction stir processing (FSP) is an innovative technique of varying the metallic features by intense, local plastic deforming. Accordingly, materials are stirred with no altering the phase via melting or otherwise to produce a microstructure with equiaxed and fine grains. This method enhances the microstructural features of metals. In This study the microstructure and the mechanical features including (tensile strength and microhardness), and radiographic inspection results are studied. All specimens of pure copper use in the (FSW) and (FSP) have variable rotating speed (900, 1200, and 1600 rpm) with constant feed speed (40 mm/min). The most remarkable results, the ultimate tensile strength for FSW and FSP at (1200 RPM and 40 mm/min) with the values of 250.4 MPa for FSW and 261..2 MPa for FSP and the efficiency reached 92.7% and 96.3% for FSP and FSW, respectively. The high hardness in the same sample was 118 HV for FSW and 135 HV for FSP. The microstructure at welding zones, specially nugget zone, is improved by the friction stir processing. Radiographic examination showed incomplete fusion of welding joint without defect.

Numerical and Experimental Investigation of Solar Air Collectors Performance Connected in Series

J.M. Jalil; K.F. Sultan; L.A. Rasheed

Engineering and Technology Journal, 2017, Volume 35, Issue 3, Pages 190-196
DOI: 10.30684/etj.35.3A.2

In the present work, the investigation on the performance of series of solar air collectors to obtain high temperature air was performed. The first collector has been studied experimentally, while the rest of the series collectors have been investigated numerically with the same boundary conditions. The experimental and numerical results of the first collector show acceptable accruement, this lead to calculate the series of collectors numerically. The results indicated that collector’s series do not work with the same efficiency. The first collector will work at low inlet air temperatures, which lead to increase in the efficiency, on the contrary for the other collectors. The results showed that, it can be determined the required number of collectors in series that necessary to obtained the required outlet air temperature.

Biological Phosphorus and Nitrogen Removal from Wastewater Using Moving Bed Biofilm Reactor (MBBR)

Mudhaffar S. Al-Zuhairy; Zainab Bahaa; Walaa S. Mizeel

Engineering and Technology Journal, 2015, Volume 33, Issue 7, Pages 1731-1739

In this research, an experimental study to evaluate nutrient removal from Al-Rustamiyah wastewater by a moving bed biofilm process was investigated.The moving bed biofilm reactorMBBR consisted of five reactors in series with one anoxic reactor MBBR-1, two aerobic reactor MBBR-2 and MBBR-3, outlet chamber and the flocculation part with dosing unit, that were operated continuously at different loading rates of phosphorus and nitrogen.The MBBR tankswere filled with suspended plastic carriers (AnoxKaldnes K5), with a 50% filling ratio. Under optimum conditions, almost complete nitrification with average ammonium removal efficiency of 82% was achieved.The average phosphorus and total nitrogen removal efficiencies were 76.79% and70%, respectively.

The Effectiveness of Line Balancing on Production Flow Efficiency: An Experimental Study

Batool Ibraheem Jameel

Engineering and Technology Journal, 2015, Volume 33, Issue 6, Pages 1357-1366

Line balancing problems are well-knownapplicationsof industrial engineering in Academic Universities. Effective Line Balancing forms the core of every successful organization as strive to increase productivity without incurring unnecessary costs. Factors contributing to high costs such as excessive overtime and work force, high level of inventory and idle time are all parts of the results of poor line balancing.
Iraqi industries suffer from a strong shockdue to high competitive products in the market associated with less cost than can be offered.To survive these industries from collapse and bankruptcy, they need to utilize theirsources effectively and efficiently to improve the productivity and reduce loses.One way to achieve that is to adopt the scientific approaches. The researchhasbeen appliedin one of the important industries based on Baghdad i.e.light IndustrialCompany assembling Gas Cooker. The assembly line left unbalancedany methodology for balancing the assembly line was not implemented on the assembly line of the company. to implement a scientific methodology production of 20 units/day was employed.When the efficiency of the assembly line analysis found low as 50% from the available efficiency and combined with low productivity.The suggested methodology shows that the production rate can been doubled with same capabilities of resources available and efficiency increased to 92%. Moreover, about 50% reduction in idle time and well-organized of the assembly line by creating 9 workstations. This effect is in addition to increasing productivity , the human factor will be affected positively by raising motivatethe morale from one side and distribute the load evenly among them from the other side .

Improvement of Vertical Savonius Wind Turbine Performance

Musawi; Mohammed Hassan Ali Al

Engineering and Technology Journal, 2013, Volume 31, Issue 14, Pages 2596-2610

This work presents a study of the vertical Savonuis wind rotor, including design,
construct, and test, with a new configuration parameters, to improve its performance.
The new rotor's parameters consist of two stages-four blades (main and
secondary). The blades are arranged such that, leaving a separation gap between the
inner ends of the blade to get the benefit of the air flow reaction energy in the bucket
on the exit side, The secondary stage height equals 1/4 of the rotor height. The blades
of the second stages are shifted by 45 degrees from main stage on the same axes.
It is expected that the secondary stage assists the starting of the rotor and prevents
the counter torque to appear in the static and dynamic torque cycle.
This Savonius rotor turbine was tested on the subsonic wind tunnel model AF100
made by TecQuipment Ltd., with the range of wind velocities (U=0 to 20 m/s), on no
load, it is found that the rotor started rotation at wind velocity of 1.2 m/s. The test of
static torque Ts was done under constant velocity of 12 m/s, and dynamic torque T
was performed under air velocities of (U=10, 12, 14, 16, and 18 m/s).
Testing results show that the Savonius rotor turbine can start at low wind velocity
from any position. The static torque coefficient Cts was improved, with peak to peak
value of (17.2 – 39) % in the positive range during cycle of α=180º. The maximum
power coefficient approach to (Cp=16% at λ= 0.8). Comparing the performance of
this turbine with the others show that the power and torque coefficients are improved.

Designing of Computer Aided Visual System for Workstations Layout Planning Based on Efficiency Criteria

Zainab A.Ibrahim

Engineering and Technology Journal, 2009, Volume 27, Issue 3, Pages 573-583

Layout planning in industrial plants means planning the location of all machines,
utilities, workers, workstations, and department...Etc.five basic types of layout, fixed-position,
cellar, process, product &hybrid. This research study Product layout problem through study
problem of arranging number of machines, workers, workstations on a production line in way
achieves uniform materials flow, this problem is known as single row facility layout, this
problem is very difficult to be solved in fact. The aim of the research is to designs and builds
computer aided visual planning system to study product layout problem, helps the management
in layout planning process and in decision making about the workstations arrangement based on
efficiency criteria. The suggested planning system was built by Auto lisp language and display
the system outputs on computer screen in two ways visual diagram (workstation timeworkstation
number), calculated outputs (actual cycle time, workstations number, efficiency
actual daily production rate) .the suggested system was applied on lawn mower production line
gets from reference to show the sequence of system working, inputs & visual outputs, so the
system will study all possible workstations layout. Current workstations arrangement consists of
series four workstations& line Efficiency=81.82%, the efficiency can improve &increases to
90% by re-arranges the workstations& distributes the total work in five serial workstations.