Table of content

AL Rafdain Engineering Journal

مجلة هندسة الرافدين

ISSN: 18130526
Publisher: Mosul University
Faculty: Engineering
Language: Arabic and English

This journal is Open Access

About

Al Rafidain Engineering Journal
Abstract

The first issue of Al Rafidain Engineering Journal published in 1993 by the college of engineering – University of Mosul. The journal is publishing at a rate of six issues in the year (Bi-Monthly).
The journal publishes the referred original and valuable engineering research papers.
Al Rafidain engineering journal includes the following titles:

• Architectural Engineering
• Civil Engineering
• Computer Engineering
• Electrical Engineering
• Environmental Engineering
• Mechanical Engineering
• Megatronic Engineering
• Water Resources Engineering
The aim of publishing the journal is to develop the knowledge in the fields of applied engineering science.

• irrigation and drainage engineering
• Computer Engineering
Target domain and
Rivers Engineering magazine aims to develop knowledge in the field of engineering and science related to it. Should contribute to the article submitted for publication in the development of engineering sciences in various fields will be considered in the dissemination of innovative and distinctive articles in these areas. Articles which are referred to the magazine for the purpose of evaluating the arbitrators with the reputation and extensive experience in the field of jurisdiction has been accepted for publication or apologize. And will be re-papers not accepted for publication to their owners.

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Contact info

ealrafidain@yahoo.com

Table of content: 2008 volume:16 issue:5

Article
Effect of Induction Motors Parameters On the Performance at Transient Operating States
تأثير عناصر المحركات الحثية على الأداء عند الحالات العابرة

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Abstract

The effect of induction motors as loads in modern electrical power systems is very large, specially when these motors suffer from transient behavior conditions. These transient conditions, which occur owing to electric faults characterized in turn by their high speeds, have their huge impact on the entire transient conditions occurring in electrical power systems. Park-Gorve equations technique is used in this research study in order to obtain the induction motor equations which are frequency variation dependent, and would thus result in getting the motor parameters under the transient operating conditions. This research study shows that maximum torque tends to increase motor current and decreasing the motor reactance. It shows that short circuit currents increase with the increase of mechanical loads of the motor. It also shows that lower moment of inertia result in larger starting motor currents and larger growth of motor current. Keywords: Induction Motors, Parameters, Transient.


Article
Multi Rate Audio Coding Based On Combining Wavelet with DCT Transform
تشفير الأشارة السمعية بمعدل بيانات متعدد بالأعتماد على ربط تحويل المويجة مع تحويل الجيب تمام

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Abstract

Abstract In this paper an efficient algorithm proposed to encode the audio signals with multirate capability. The algorithm based on combining discrete wavelet with DCT transform for maximum decorrelation. The coefficients of the frame are scaled and encoded using non uniform quantizer. The main features of this algorithm are: low complexity and near transparent audio quality resulted in the range 48 – 64 Kbps for most SQAM signals. The algorithm outperform much better than DWPT with SPIHT algorithm previously. Keyword : wavelet , DCT , audio , coding , Huffman , and psychoacoustics.


Article
A New Technique Of Microcomputer Based Overcurrent Relay
تقنية جديدة لمرحلة فرط التيار باستخدام الحاسب الدقيق

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Abstract

Abstract A new technique of three phase overcurrent relay is described in this paper. The performance of the new design shows the ability to obtain any shape of characteristic using exponential type model with high accuracy. Also the new design used more accuracy, fast measurement for peak detection with error less than 2%. The relay tested for normal and very inverse characteristics, also tested for line-to-line fault the results show the ability of discrimination the fault current and isolate the section of the system affected by a fault so that the remaining system can continue to operate normally. Key-words: overcurrent relay, Peak detector, time coordination margin (TC), time multiplier setting (TMS), Programmable Peripheral Interface 8255 (PPI).


Article
The Earth Thermal Machin And The Green House Effect Bassam M. Mustafa
الماكنة الحرارية الأرضية والاحتباس الحراري

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Abstract

In this research we try to explain the greenhouse effect by suggesting a model looking to the earth –atmosphere system as a thermal machine .In this model earth absorbed heat and light energy from the sun ,doing work in achieving biological and other activities . the access energy is transmitted to the space. This system really represent a reversible thermal machine obey the 2nd law of thermodynamics and with efficiency about 56% . But the increase in the burning materials lead to an increase in the percentage of CO2 ,and since its molecules can absorb the radiation from the earth . thus leads to form irreversible engine with entropy production , by calculating the increase in CO2 the increase in entropy production is calculated . The increase in entropy increase earth’s temperature and lead to the greenhouse effect . Key Words : Green house , Global otel for Green house, Atouspheric changes.


Article
Adaptive Filter Application in Echo Cancellation System and Implementation using FPGA
تطبيق المرشح المتكيف في نظام إلغاء الصدى وتنفيذه باستخدام شريحة مصفوفة البوابات المبرمجة حقليا

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Abstract In telephony system, the received signal by the loudspeaker, is reverberated through the environment and picked up by the microphone. It is called an echo signal. Which is in the form of time delayed and attenuated image of original speech signal, and causes a reduction in the quality of the communication. Adaptive filters are a class of filters that iteratively alter their parameters in order to minimize a difference between a desired output and their output. In the case of acoustic echo, the optimal output is an echoed signal that accurately emulates the unwanted echo signal. This is then used to negate the echo in the return signal. The better the adaptive filter simulates this echo, the more successful the cancellation will be. This paper examines LMS algorithm of adaptive filtering and the application in acoustic echo cancellation system. Employing a discrete signal processing in Matlab for simulation with real acoustic signals. Also a hardware implementation of an adaptive filter have been developed using XC3S500E Xilinx FPGA chip, and VHDL language on RTL abstraction level. Keywords: Acoustic echo cancellation, Adaptive Filter, FPGA, VHDL.


Article
Advance of wetting pattern during redistribution phase under trickle source
تقدم جبهة الابتلال خلال طور اعادة توزيع الرطوبة تحت مصدر نقطي

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Abstract

Abstract The soil wetting pattern under a trickle source is developed from water movement in wetting phase and redistribution phase. The present study included developing equations for vertical advance and horizontal advance of the wetting front during the redistribution phase. The advance is a function of time from the beginning of water application, total application time, water application rate, and saturated hydraulic conductivity. The same of equations can be used during the wetting phase too. The data of water movement in the soil under trickle source were obtained from previously developed researches. Key words : trickle source, wetting pattern, wetting phase, redistribution phase.


Article
The Daily Optimal Management Of Dokan Reservoir At Minimum Levels Of Discharges For Maximaze The Hydroelectric Power
الإدارة اليومية المثلى لخزان سد دوكان عند مستويات متدنية من التصاريف لتعظيم القدرة الكهرومائية

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Abstract

Abstract Aim of the present research is to find the best optimal daily management and operation policy of Dokan dam reservoir using Discrete Differential Dynamic Programming(DDDP) at minimum levels of inflow discharge during the period of 30 years for maximizing the hydropower generation (1965-1995). The results of this study were compared with previous results for an optimal monthly management and operation policy for the same reservoir and the same year. . It has been found that the total annual hydroelectric generation power for the case under investigation is 1073 MW, ie, an increase of 93 MW from the monthly operation of 980 MW. Also,it has been found that the number of trials to reach the optimal management ranged between 70and 90 trials in the daily operation, while the optimal management was observed in the case of monthly operation at were trialsfrom35to70. All results obtained for the daily optimal operation policy were good without neglecting any restrictions demanded taken in to consideration. Key words: water resources, optimal management, hydroelectric power


Article
Tele-operated Vehicles System Using WLAN and Industrial Ethernet Techniques
تقييم أداء الشبكات المحلية اللاسلكية و شبكة أثرنيت الصناعية في أنظمة المركبات المسيطر عليها عن بعد

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Abstract

Abstract Tele-operated vehicles have been used in different applications and environments. This paper studies the case in which a Tele-operated vehicle is guided through city streets. OPNET package is used to simulate the behavior of the system. Industrial Ethernet is assumed to be the field bus network of the vehicle and WLAN technique (IEEE802.11b) is assumed to be the communication link between the vehicle and the control center. The real time performance of the system is investigated during changing some important parameters. Then , image compressing technique is used to enhance the real time behavior of the system. Keywords: Tele-operated Vehicle, Industrial Ethernet , WLAN , Image Compression


Article
Plot in Architecture The representation of a single point In time
الحبكة في العمارة تمثيل اللحظة المنفردة في الزمن

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Abstract

The architectural literatures dealt with plot as a tool to create the architectural text , using it as a mean of giving order , selecting , sequencing or developing images in the design process as it is connected with the intertextual texts or texts that telling stories and representing events. It is a plan to create an architectural product and to map out the structure of design process and the harmonically consequences of its steps. It works in two levels : the conceptual structure and the formal one. The research dealt with a temporal sequence of events and the representation of time in spatial form , it focused on the single point in time or “ frozen moment “ common to realism , photography, or even the ordinary genre scenic frames one episode while implying what went before and what will follow.The study results comes up with new characteristics and values for the single point in time and the conclusions showed that this strategy contains in some of its parts the strategy of linear consequences that links a series of individual episodes into linear sequences and it determined the specific differences between them. Key word : plot, temporal patterns of events, sequence of events, structure of events, architectural Narrative.


Article
Forced Vibration Analysis Of Rectagular Plates Usinig Higher Order Finite Layer Method
تحليل الاهتزاز القسري للصفائح المستطيلة باستخدام طريقة الطبقة المحددة ذات النسق العالي

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Abstract

Abstract In this paper a higher order finite layer formulation based on the auxiliary nodal surface (ANS) technique for a forced vibration analysis of rectangular plates is presented. The forced vibration analysis has been performed using the Newmark integration method for investigating the vibration characteristics and finding the response of rectangular plates under the action of dynamic loads. The forced vibration of the rectangular plates subjected to moving and impact loads has been studied. Several examples have been studied to show the good performance of the higher order finite layer with one ANS for forced vibration analysis of plate. Keywords: Finite layer, Forced Vibration, Thick Plate.


Article
The Relation of Space Containment of Traditional Alleys with its Integration Degree (An Analytical Study of the District of Jame Al-Kabeer in the Old City of Mosul)
علاقة الاحتواء الفضائي للأزقة التقليدية بدرجة تكاملها (دراسة تحليلية لمنطقة الجامع الكبير في مدينة الموصل القديمة)

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Abstract

Abstract The Arabic–Islamic cities is characterized with its narrow alleys and their hierarchy in width and containment. So the district of Jame Al-Kabeer which represents an example of the urban fabric of the old Arabic–Islamic city of Mosul has been selected to measure the degree of alley's containment enclosure by measuring the percentage of the width (W) of the alley to the height (H) and its integration within the Space Syntax theory. The shape of the integration core was peripherical integration core and the segregation core was in the center of the district. The percentage of the narrow alleys was 60.6% and the normal alleys 3.4% which represent the high degree of enclosure of the alleys in general. The statistical relation between the degree of integration and the degree of containment of the alleys was significant. Key Words: Urban Design, Urban Space, Arabic – Islamic Cities.


Article
Nonlinear Finite Element Analysis of Fibrous Reinforced Concrete Beam-Column Joints
التحليل غير الخطي بالعناصر المحددة لعقد عتبة-عمود خراسانية ليفية مسلحة

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In this paper, the finite element method is used to study the nonlinear behaviour of beam-column fibrous reinforced concrete joints under short–term monotonic loading. Concrete is represented by eight nodded isoparametric elements and the reinforcement was represented by axial two noded bar elements embedded in the concrete elements. Strain hardening approach, has been employed to model the compressive behavior of the fibrous concrete. In tension a continuous function is used to model fibrous concrete in the pre-peak and post – peak states. Material nonlinearities due to cracking of concrete, crushing of concrete in compression, debonding and pull – out of fibers and yielding of reinforcement have been taken into account. A smeared fixed crack approach of the cracked concrete in tension is assumed. An incremental – iterative scheme based on Newton – Raphson’s method is employed for the nonlinear solution algorithm and a displacement criterion is adopted for checking the convergence of the solution. Several previously published test results for fiber reinforced concrete beam-column joints were analyzed and the numerical results showed good agreement with the published experimental results. Keywords: Beam, Column, Fibrous concrete, Finite element, Joint, Nonlinear analysis.


Article
The Effect Of Center Distance Change On Gear Teeth Engagement And Stress Analysis
تأثير تغير مسافة المراكز على تعشيق أسنان التروس وتحليل الإجهادات المتولدة فيها

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Abstract

Abstract The present study concentrates on the changes in gear teeth engagement and stress analysis of meshing teeth when gearing system is operated at a non-standard extended center distance. (Ansys) programming using F.E.M have been applied for stress analysis on a gear model. Many cases with changing center distance have been studied. It is clear that the operating center distance was increased; the stresses generated on tooth will be increased dependently. Keywords : Spur gear, Center distance, Teeth engagement, Stress analysis


Article
Thermal and Economic Evaluation of Using a Single Stage LiBr-H2O Absorption Chiller to Boost the Power Output of a Gas Turbine Generator
التقييم الحراري والاقتصادي لاستخدام منظومة تبريد امتصاصي لرفع القدرة الناتجة من التوربينات الغازية

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Abstract

Abstract The exhaust gases of gas turbines carry a significant amount of thermal energy that is usually expelled to the atmosphere without taking any further part in the power generation process. This low grade thermal energy can however be put into beneficial use as a heat source to a vapor absorption chiller that serves as cooling system to be operated during hot months to cool inlet air to the gas turbine to raise its power generation design level. This paper describes the thermal and economic advantages of using a Single Stage LiBr-H2O absorption chiller to boost the power output of a gas turbine generator with application to Mosul gas turbine power plant. The results showed that maximum increase in power output when inlet cooling involved is approximately 17.5%, which occurs in July and August being the hottest month in the year. The economic results showed that maximum economic saving of $34.9 million dollar which represent 8% saving can be obtained at inflation rate of 6% and interest rate of 1%. Key words : Gasturbine , Absorption system , Thermal analysis , Economic analysis.


Article
Load Sharing On Spur Gear Teeth And Stress Analysis When Contact Ratio Changed
تقسيم الحمل على أسنان التروس وتحليل الإجهادات عند تغير نسبة التماس

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Abstract The present research work concentrates on the effect of contact ratio change on the stresses generated on meshing gear teeth. Many cases of contact ratio (1.6, 1.7, 1.8, 1.9 & 2.0) have been studied. In each case the value and location of load were determined on the involute profile of meshing tooth. Also the angular position of this tooth for critical loading condition (at the instant when the generated root stresses at the maximum state). (Ansys) programming using F.E.M have been applied for stress analysis on gear model. From this study it is clear that, the highest contact ratio resulted in the lowest generated tooth stresses (i.e. the highest load carrying capacity). This depends on the value, location and direction of load applied on tooth involute. Keywords : Spur gear, Contact ratio, Load sharing, Stress analysis

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