Iraqi Journal for Mechanical and Materials Engineering最新文献_第7页

THE EFFECT OF CONVERGENT-DIVERGENT NOZZLE PROFILE ON ITS PERFORMANCE 聚散型喷嘴对其性能的影响

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2019-03-08 DOI: 10.32852/IQJFMME.V19I1.262

Arkan Al-taie, Hussien W Mashi, A. Hadi

{"title":"THE EFFECT OF CONVERGENT-DIVERGENT NOZZLE PROFILE ON ITS PERFORMANCE","authors":"Arkan Al-taie, Hussien W Mashi, A. Hadi","doi":"10.32852/IQJFMME.V19I1.262","DOIUrl":"https://doi.org/10.32852/IQJFMME.V19I1.262","url":null,"abstract":"The paper presents the effect of convergent-divergent nozzles profile across specified inlet pressures values from (1.5 bar-4 bar), with constant back pressure of (1 bar). The flow of air through three convergent-divergent nozzles was studied theoretically. The flow was assumed to be one-dimensional, adiabatic and reversible (isentropic). The flow parameters like static pressure ratio and Mach number were analyzed. The flow parameters were obtained in term of area ratio along the nozzle. MATLAB code was built in order to find the Mach number along the nozzles, by using Newton-Raphson method. The shockwave position inside the nozzles was determined, using \"analytic method\". ANSYS fluent 18 was used to simulate the flow through the three nozzles. Two- dimensional, turbulent and viscous models were utilized to solve the governing equations. K-? model was used to model the turbulent effect. The results concluded that, reduction in inlet pressure can not affect the flow upstream the throat. Also the shockwave appearance can be noticed by a sudden rise in static pressure associated with a sharp decrease in Mach number. Shockwave moves toward the throat by reduction the inlet total pressure .By comparison the static pressure distribution along the three nozzles where can be deduced that the profile has an effect on the flow character i.e. (static pressure Mach no).The best performance among the nozzles is the performance of nozzle (N1), which (75%) of its length work as nozzle at the lowest inlet pressure of (1.5bar) while (44% and 60%) of the nozzles length for (N2 and N3) respectively work as the nozzle.","PeriodicalId":31812,"journal":{"name":"Iraqi Journal for Mechanical and Materials Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48232563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

HEURISTIC METHOD FOR SOLVING CELL FORMATION PROBLEM IN CELLULAR MANUFACTURING SYSTEM BASED ON HAMMING DISTANCE 基于汉明距离求解元胞制造系统中细胞形成问题的启发式方法

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2019-03-08 DOI: 10.32852/IQJFMME.V19I1.267

S. Hamza, Ammar Jehad

{"title":"HEURISTIC METHOD FOR SOLVING CELL FORMATION PROBLEM IN CELLULAR MANUFACTURING SYSTEM BASED ON HAMMING DISTANCE","authors":"S. Hamza, Ammar Jehad","doi":"10.32852/IQJFMME.V19I1.267","DOIUrl":"https://doi.org/10.32852/IQJFMME.V19I1.267","url":null,"abstract":"Cell Formation (CF) problem considers as the most important issue in the CellularManufacturing (CM) system particularly the design step. CF deals with the creation ofmachine cells (MCs) and part families (PFs). Numerous methods, algorithms andmathematical models were proposed and used in the literature for solving the CF problem.The current paper used a heuristic method based on the hamming distance to form MCs&PFs, this proposed method calculates the hamming distance for the parts, firstly thenrearranges them based on the results to shape the PFs. Afterward, the hamming distance wascalculated for machines, then the machines rearranged based on the results to form the MCs.Three datasets from the literature were utilized to validate the proposed method. Fiveperformance measures were used for comparison and evaluation, these measures areExceptional Elements EE, Percent of Exceptional elements PE, Voids, Grouping EfficiencyGE and Machine Utilization MU. The results referred to the outperforms of the hammingdistance based method comparing with the best known results in the literature. Among thetotal 20 performance indexes: three are better than, twelve are equal to and five are almostequivalent to the best known results. On the other hand, the proposed hamming distancebased method is effectual particularly in terms of the number of machine cells and PE.","PeriodicalId":31812,"journal":{"name":"Iraqi Journal for Mechanical and Materials Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46206387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

STUDYING THE EFFECT OF NATURAL BAMBOO AND RICE HUSK POWDERS ON COMPRESSIVE STRENGTH and HARDNESS OF ACRYLIC RESIN 天然竹和稻壳粉对丙烯酸树脂抗压强度和硬度影响的研究

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2019-03-08 DOI: 10.32852/IQJFMME.V19I1.265

Jawad K. Oleiwi, Q. Hamad, H. Rahman

{"title":"STUDYING THE EFFECT OF NATURAL BAMBOO AND RICE HUSK POWDERS ON COMPRESSIVE STRENGTH and HARDNESS OF ACRYLIC RESIN","authors":"Jawad K. Oleiwi, Q. Hamad, H. Rahman","doi":"10.32852/IQJFMME.V19I1.265","DOIUrl":"https://doi.org/10.32852/IQJFMME.V19I1.265","url":null,"abstract":"Denture base is the part of a denture that rests on the foundation tissues and to which teeth areAttached. Denture base may be complete or partial used for the alteration of missing natural teeth.The most popular material utilized for the fabrication of dentures base is the poly (methylmethacrylate) (PMMA) because is distinguished by many characteristic. The remarkable clarity ofa methyl methacrylate resin, its relatively high strength and hardness, its color stability under allconditions of dental use, its insolubility in the mouth fluids, all of these properties combine toprovide an excellent material for the prosthetics denture (S. S Carmen, 2010 and R. K. Alla 2013).This survey illustrate the effect of particle size of powders and weight fraction of natural Bambooand Rice Husk powders on PMMA, with the selected size particles of (25?m and 75?m) andweight fraction (2, 4, 6 and 8wt. %), on compression strength and hardness, and these experiencewere accomplished at a temperature of laboratory. The results showed improved in the hardnessand compression with concentration rate of Rice Husk and Bamboo powders in compositesamples. Also, the highest values of compressive strength and hardness were (300MPa.) and (86)respectively for (PMMA-8%RH) and particle size (25 ?m).","PeriodicalId":31812,"journal":{"name":"Iraqi Journal for Mechanical and Materials Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49299809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

COMPARATIVE ANALYSIS ON NUMERICAL MODELLING AND EXPERIMENTS OF THE CUTTING TEMPERATURE IN MAGNETIC ABRASIVE FINISHING PROCESS 磁磨料精加工过程切削温度的数值模拟与实验对比分析

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2019-03-08 DOI: 10.32852/IQJFMME.V19I1.260

A. Kadhum

{"title":"COMPARATIVE ANALYSIS ON NUMERICAL MODELLING AND EXPERIMENTS OF THE CUTTING TEMPERATURE IN MAGNETIC ABRASIVE FINISHING PROCESS","authors":"A. Kadhum","doi":"10.32852/IQJFMME.V19I1.260","DOIUrl":"https://doi.org/10.32852/IQJFMME.V19I1.260","url":null,"abstract":"In Magnetic Abrasive Finishing (MAF) process the cutting temperature is generated from two sources, from the electromagnetic flux (electrical heat), and from magnetic abrasive brush due to the friction force (mechanical heat). The cutting temperature has significant effects upon the condition of the surface, whereas it is less studied than the other parameters. In this study, an attempt has been made to simulate and investigate the influence of cutting parameters on the cutting temperature, to improve the thermal effect by MAF process. The aims of this study was to determine the distribution of the cutting temperature in the working gap, numerically and experimentally, then compared the results. In addition, to determine the most influence parameters affecting on the cutting temperature for Brass alloy CuZn28. Two dimensional Finite Element Models (FEM) with two software’s were developed to predict the temperature by dynamic electric and magnetic field, the first was DEFORM 10.2 used to calculate the mechanical heat and the second was COMSOL5.2 used to calculate the electrical heat. Sixteen tests designed according to Taguchi matrix through the orthogonal array (OA) L16 (). There are four various parameters that, have a large impact on cutting temperature, with four levels (rotational speed (A), working time (B), current (C), and working gap (D)). The analysis of the variance (ANOVA) technique was utilized to analysis the results, by using the statistical software (MINITAB-17). From the results, it is concluded that the Numerical modeling gives a very good comparison with the values of experimental tests. The maximum difference between the numerical and experimental temperature for brass CuZn28 is less than (9%).","PeriodicalId":31812,"journal":{"name":"Iraqi Journal for Mechanical and Materials Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48124461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

A COMPARATIVE STUDY FOR WHEELED MOBILE ROBOT PATH PLANNING BASED ON MODIFIED INTELLIGENT ALGORITHMS 基于改进智能算法的轮式移动机器人路径规划比较研究

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2019-03-08 DOI: 10.32852/IQJFMME.V19I1.266

M. M. A. Nayar, K. Dagher, E. A. Hadi

引用次数: 2

THE ORETICAL ANALYSIS ON THE PERFORMANCE OF BRANCHED GAX CHILLER CYCLE GAX制冷机分支循环性能的理论分析

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2019-01-06 DOI: 10.32852/IQJFMME.V18I4.230

Q. R. Al-amir, N. Y. Khudair

{"title":"THE ORETICAL ANALYSIS ON THE PERFORMANCE OF BRANCHED GAX CHILLER CYCLE","authors":"Q. R. Al-amir, N. Y. Khudair","doi":"10.32852/IQJFMME.V18I4.230","DOIUrl":"https://doi.org/10.32852/IQJFMME.V18I4.230","url":null,"abstract":"In this study, a branched GAX absorption cycle operating with NH3-H2O pair has beeninvestigated to assess its performance under steady state conditions. The cycle modeling isimplemented using Engineering Equation Solver (EES) software. Analysis includesequations of mass, species and energy conservation. The analysis is used to simulate a GAXabsorption chiller utilization for air conditioning applications with a nominal capacity of 95TR. This chiller uses solar collectors as heat source. The operating parameters are selected atdifferent values of the heat source temperature (140 - 185°C), condenser exit temperature(30 to 48°C), evaporator exit temperature (2 to 11°C) ; split ratio (0 to 0.18); the difference inammonia concentration(0.25-036), mass flow rate in solution pump mr=1 kg/s; heatexchanger effectiveness ? ? 0.8. The results showed that the average COP is sensitive tooperating conditions where the average COP and cooling capacity of the branched GAXabsorption chiller increase with increasing generator and evaporator temperature whereasthey decrease with increasing condenser temperature. Simulation results also show that thesplit ratio and ammonia concentration difference have a significant impact on theperformance of absorption chiller.","PeriodicalId":31812,"journal":{"name":"Iraqi Journal for Mechanical and Materials Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44572518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

MODELING STUDY OF PV POWER PLANTS IN DIFFERENT IRAQ’S GOVERNORATES 伊拉克不同省份光伏发电厂的建模研究

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2019-01-06 DOI: 10.32852/IQJFMME.V18I4.233

A. R. Abdulmunem, M. Jabal, Muhannad Z Khlefia

引用次数: 1

NUM ERICAL AND EXPERIMENTAL INVESTIGATIONS OF CUTTING FORCE FOR NAB-CBN COMPOSITE NAB-CBN复合材料切削力的数值模拟与实验研究

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2019-01-06 DOI: 10.32852/IQJFMME.V18I4.231

Alaa Jaafar, H. Al-Ethari

引用次数: 2

INVESTIGATION OF SUPERPLASTIC BEHAVIOR OF CERTAIN (Zn – Al) ALLOYS 某些（Zn–Al）合金的超塑性行为研究

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2019-01-06 DOI: 10.32852/IQJFMME.V18I4.232

S. Abed, A. K. Rajih, A. O. Al-Roubaiy

{"title":"INVESTIGATION OF SUPERPLASTIC BEHAVIOR OF CERTAIN (Zn – Al) ALLOYS","authors":"S. Abed, A. K. Rajih, A. O. Al-Roubaiy","doi":"10.32852/IQJFMME.V18I4.232","DOIUrl":"https://doi.org/10.32852/IQJFMME.V18I4.232","url":null,"abstract":"Super plasticity behavior finds applications in so many fields, for example the aerospacemanufacturing that is the main bazaar for super plasticity, but automotive, medical, sports,cookware and architectural applications have their share too. \"In this work a study of thesuperplastic behavior of a new Zn-Al alloy was conducted. In addition to the investigation ofthe possible superplastic behavior of Zn-0.5Al alloy. These alloys were prepared by usinggravity and chill casting techniques. Zn-0.5Al alloy was subjected to hot rolling at 250 ºCand cold rolling at room temperature, while Zn-48Al alloy was also hot rolled at 250 ºC to20% reduction in the thickness of sample followed by partial remelting at 500 ºC. Severaltests were carried out such as physical, mechanical and chemical which include (XRF, XRD,OP, SEM, Microhardness (HV) and Tensile (cold, hot) test). Results showed that the\"Zn-0.5Al alloy has poor mechanical properties and may not be regarded as a superplastic alloycompared with Zn-48Al alloy. The Zn-48Al alloy generally enhanced all properties. Themaximum elongation of (450%) was obtained in Zn-48Al alloy after thermomechanicalcontrolling process and partial remelting.","PeriodicalId":31812,"journal":{"name":"Iraqi Journal for Mechanical and Materials Engineering","volume":"143 51","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41308510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

T RIBOLOGICAL PERFORMANCE OF MUSTARD SEEDS OIL UNDER DIFFERENT LOADS USING PIN-ON-DISK TRIBOTESTER 用针盘式摩擦试验机研究芥子油在不同载荷下的摩擦学性能

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2019-01-06 DOI: 10.32852/IQJFMME.V18I4.234

M. Jabal, Muhannad Z Khlefia, A. R. Abdulmunem

引用次数: 4