KEMAL ERMİŞ - Academia.edu (original) (raw)

Papers by KEMAL ERMİŞ

Abstract With developments in technology, the dimensions of air-conditioning systems are becoming... more Abstract With developments in technology, the dimensions of air-conditioning systems are becoming smaller. Small hydraulic-diameter, multiport tubes made of extruded aluminum are used for automotive refrigerant condensers and in process industries. Condensers have been employed for heat transfer using small hydraulic-diameter tubes with rectangular shapes. This chapter investigates the results of experiments in subcooled liquid R-134a and two-phase heat transfer and friction pressure drop for R-134a in small tubes. The tubes had different rectangular ports tested at 1.26 and 2.64 mm hydraulic diameter for single-phase and two-phase flow, respectively. This chapter provides heat transfer data and pressure drop gradients at 8 kW/m 2 heat flux and 40°C for different mass velocities. In addition, data obtained from the experimental study are compared with prediction correlations and numerical analysis. The numerical analysis study was conducted for Tube C by using the ANSYS-Fluent packet program. An artificial neural network was conducted for Tube C using a back-propagation network. Results are compared in the study.

Nowadays, turbocharger application of internal combustion engine has increased. Turbocharger powe... more Nowadays, turbocharger application of internal combustion engine has increased. Turbocharger powered by exhaust gas defined as a supercharger. Turbocharger, including the turbine compressor and the suction side of the exhaust side has two propellers. The reason for modifying the turbocharger system into the internal combustion engine, it provides improvement of the engine’s performance, fuel consumption and emissions. When turbocharger application used in engine, the suction air temperature increases in the engine and this cause the emergence of undesirable combustion conditions. To reduce this situation, application of intercooling in vehicle is used. In this study, it is determined the thermal evaluation of thermodynamic calculations and the air temperatures of compressor outlet in accordance with the cycle principles of the present diesel engine tractor, made of Basak Tractors and Agricultural Machinery Industry and Trade Business in Turkey. In addition, excessive filled Turbo-Co...

Skip to Main Content. Wiley Online Library will be disrupted on 25 August from 13:00-15:00 BST (0... more Skip to Main Content. Wiley Online Library will be disrupted on 25 August from 13:00-15:00 BST (08:00-10:00 EDT) for essential maintenance. ...

Ultra-high molecular weight polyethylene (UHMWPE) polymer is widely used in medical applications ... more Ultra-high molecular weight polyethylene (UHMWPE) polymer is widely used in medical applications such as orthopedic implant in recent years due to its tensile strength, bio-compatibility, low friction coefficient, long life durability, chemical resistance and wear resistance. In addition, it is also successfully used in engineering application such as bearing material applications.1,2 These properties enable the material to be used in a range of high-tech industrial applications. Knee joints are the only solution for patients who are completely worn out and are commonly used in prosthetic applications. Prosthesis geometry and type of loading determine the size of prosthetic contact stresses and contact areas.3 On the other hand, the tribological performance of the prosthetic material is very important in applications where wear occurs. In such applications, there should be no abrasion or very low wear and the debris particles produced mustn’t be toxic. Excessive wear on prosthetic m...

e-Polymers, 2011

The wear and friction performance of GUR 1020 grade ultrahigh molecular weight polyethylene (UHMW... more The wear and friction performance of GUR 1020 grade ultrahigh molecular weight polyethylene (UHMWPE) polymer was studied in distilled water, HASS (Hank’s balanced salt solution) and several protein lubrication environments. Wear tests were carried out using polymer pin -on AISI 304L stainless steel disc apparatus. Tests conditions were room temperature, 40N, 80N and 120N applied loads and 0.5 m/s sliding speed. For the range of load and speed value of this work, the coefficient of friction and wear rate for UHMWPE polymer decreases with the increase in applied load values. The coefficient of friction is highest and the specific wear rate values is lowest under HASS +HA solution lubricant. The average specific wear rate values for UHMWPE polymer under distilled water and HASS+HA (Hank’s balanced salt solution with Hyaluronic acid) lubrication conditions are in the order of 9x10

Energy Management Handbook, Fourth Edition, 2001

International Journal of Automotive Science and Technology

In this study, the effects of surface roughness differences of vehicle coating materials (paint, ... more In this study, the effects of surface roughness differences of vehicle coating materials (paint, paste, special applications, etc.) on the aerodynamic drag coefficient were inves-tigated using the finite element method. For this, aerodynamic drag forces and aerody-namic drag coefficients for speeds between 40-150 km/hours were calculated for a 1/20 scale vehicle designed by a package program by defining the body parts and front-rear window parts separately and assigning pre-calculated roughness values suitable in the industry, and the results were presented through graphs and visuals. Using three different paint roughness values (low, medium, and high), and one commonly used Teflon (fluoropolymer) coating, it was observed that the aerodynamic resistance coefficient in-creased with increasing roughness levels. Relative to the aerodynamic resistance coeffi-cient for the lowest paint roughness value, the aerodynamic resistance coefficient for the medium roughness value showed an increa...

International Advanced Researches and Engineering Journal

In this study, the mechanical performances of neat Polyamide 6 (PA6) polymer, 20wt.% glass fiber ... more In this study, the mechanical performances of neat Polyamide 6 (PA6) polymer, 20wt.% glass fiber reinforced PA6, and 8% SEBS elastomer with 20% glass fiber reinforced PA6 composite were investigated. Composite materials were first produced in the form of granules by using a twin-screw extruder. Later, mechanical test samples were molded, in accordance with the American Society of Testing Materials (ASTM) standards, using an injection molding technique. Mechanical parameters such as tensile strength, tensile modulus, elongation at break, impact strength, flexural strength, and flexural modulus were determined by tensile, impact, and bending tests. With the addition of 20wt.% glass fiber reinforcement to the PA6 polymer matrix, properties such as tensile strength, tensile modulus, flexural strength, and flexural modulus increased, while properties such as elongation at break and impact strength decreased. For the 20% glass fiber reinforced PA6 composite with 8% SEBS rubber additive, w...

Journal of Materials and Mechatronics: A

In the automotive industry and many industries, parts are expected to meet certain requirements w... more In the automotive industry and many industries, parts are expected to meet certain requirements with regards to their tensile strength, stiffness, and high impact strength. For this reason, polypropylene homopolymer, which is a fragile polymer widely used in the automotive industry, is combined with additives to reduce its fragility. In this study, the mechanical and microstructural properties of polyolefin rubber and glass bead filled polypropylene composites have been investigated. Polypropylene (PP) was combined with polyolefin rubber (POE) and glass beads (GB) at different weight rates to create the composites and pure polypropylene was compared to the three prepared PP composites; 8% polyolefin rubber by weight, 8% glass bead by weight, and 8% polyolefin rubber and 8% glass bead by weight. The fracture surface examinations of the pure polypropylene (PP), and the polyolefin rubber added PP, glass bead added PP, and polyolefin rubber and glass bead added PP composites were carrie...

Iğdır Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 2021

Bu çalışma, elektriksel kontak kesici uygulamalarında kullanılabilecek aşınmaya dayanıklı en iyi ... more Bu çalışma, elektriksel kontak kesici uygulamalarında kullanılabilecek aşınmaya dayanıklı en iyi polimer veya polimer kompozit çiftini bulmayı hedeflemiştir. Bunun için disk üzerinde pim aşınma düzeneği kullanılmıştır. Pim malzemesi olarak katkısız poli-eter-eter-keton (PEEK) polimeri ile ağırlıkça %20 ve %30 oranında cam elyaf (CE) takviyeli PEEK kompozitleri kullanılmıştır. Karşı disk malzeme olarak ise uzun cam elyaf takviyeli ve kalsiyum karbonat mineral dolgulu doymamış polyester kompozit malzeme kullanılmıştır. Tribolojik deneylerde cam elyaf katkı oranının aşınmaya etkisi incelenmiş aynı zamanda uygulanan basıncın etkisi de araştırılmıştır. Tribolojik testler, oda sıcaklığında 1.77, 3.53 ve 5.30 MPa basınçlar altında ve 30 m/dak kayma hızında oda sıcaklığında gerçekleştirilmiştir. Elde edilen sonuçlardan, en yüksek aşınma oranı 5.30 MPa basınç altında 4.42x10-14 m2 N-1 değerine sahip PEEK+%30CE polimer kompozitinde elde edilmiştir. En düşük aşınma oranı ise 1.77 MPa basınç al...

Evaporator is one of the most energy intensive sections of a number of process industries such as... more Evaporator is one of the most energy intensive sections of a number of process industries such as pulp and paper, sugar, desalination, pharmaceuticals, dairy and food processing, etc. Single effect evaporator can be wasteful of energy if the vapor’s heat is not used. This heat can be recovered and re-used by employing multiple-effect evaporators. In this study, investigation of selection of type of evaporator using some parameters is presented for multiple effect evaporator system. Energy and economical equations are given with a case study for multiple effect evaporator system. As result of calculations, it has been found that about 3.51 of overall economy is obtained according to single evaporator.

International Journal of Automotive Science and Technology, 2021

Bumper beams and crash boxes are structural vehicle elements that have very critical functions du... more Bumper beams and crash boxes are structural vehicle elements that have very critical functions during frontal collisions. This study examined the energy ab-sorbed by the front bumper system and the reaction forces to the cage structure representing the vehicle cabin frame during a full frontal crash against a rigid wall. For this purpose, 25 different crash analyses were conducted using the ANSYS software by changing the sheet thickness values of the bumper beam (t1) and crash boxes-frontal crash rails (t2) that make up the front bumper system. The internal energy (absorbed energy) of the front bumper elements from the analysis results and the reaction forces acting on the representative cage struc-ture in the opposite direction to the movement were examined. When the ob-tained data were interpreted according to variable thickness, it was observed that the variable t2 significantly affected both the absorbed energy and reaction force results, while the variable t1 did not have a sig...

Nowadays, there are many different models of panel radiators in used heating system. Panel radiat... more Nowadays, there are many different models of panel radiators in used heating system. Panel radiator designs that have been manufactured by various producers are very similar and their products have very similar thermal efficiency and specific heating per unit weight of the radiator. In this study, CFD (code of STARCCM+) analysis of existing panel radiators were made with variable connection methods in three-dimensional space. Numerical thermal efficiency values were obtained and were compared with given catalogue values. Panel-convector-convector-panel radiator, type-22-600x500, was used as a model in this numerical study. Also, the effect of variation at air-side convective heat transfer coefficient on the thermal output was also investigated in this study. After optimum air-side convective heat transfer coefficient had been determined, numerical analyses of the panel radiator were done based on this value. For top-bottom-opposite-end connection, mass flow rate distribution is grea...

Esas olarak ekonomik gelisme, sehirlesme ve nufus artisi gibi nedenlerle enerji ihtiyaci surekli ... more Esas olarak ekonomik gelisme, sehirlesme ve nufus artisi gibi nedenlerle enerji ihtiyaci surekli artis egilimi gostermektedir. Enerji talebinin karsilanmasinda dunyada halen fosil enerji kaynaklari en buyuk orani olusturmaktadir. Fosil enerji kaynaklarinin kullanimi sonucunda basta CO2 olmak uzere sera gazi emisyonlari salinimi olusmakta, kuresel isinma ve iklim degisikligi gibi bir buyuk kuresel sorunlar ortaya cikmaktadir. Ayrica sinirli olan bu fosil kaynaklarin yakin gelecekte tukenecek olmasi gercegi surdurulebilir enerji kavramini ortaya cikarmaktadir. Buna bagli olarak, gelecek yillarda surdurulebilir enerjiye gecis insanoglunun bu yuzyilda karsilastigi onemli sorunlardan biri olarak gorulmektedir. Surdurulebilir enerji sadece gelecekteki ihtiyaclari karsilamak icin gerekli enerjinin temin edilmesi zorunlulugu olarak gorulmemektedir. Bununla birlikte; tehlikeli iklim degisikliginin onleyecek, dogal sistemlerin butunlugunu koruyacak, modern enerji bicimlerine ulasamayan insanl...

In this study, nonlinear dynamic analysis of laminated composite plates supported by springs is i... more In this study, nonlinear dynamic analysis of laminated composite plates supported by springs is investigated. Three different plate materials are selected for the analysis. Nonlinear free vibrations of laminated composite plates are studied in two different boundary conditions. These boundary conditions are free and simply supported. The classical finite element method is used for the analysis. Spring supports stiffness matrix and nonlinear stiffness matrix are developed specifically to analysis. A code of computer program with Matlab is prepared for the calculations. Effect of boundary conditions and material properties are investigated on nonlinear free vibrations of composite plate. The results are graphically presented and discussed.

In this experimental study, pure ultra-high molecular weight polyethylene (UHMWPE) and casting po... more In this experimental study, pure ultra-high molecular weight polyethylene (UHMWPE) and casting polyamide (Casting PA) polymers were used to find the best wear resistant polymer material that can be used in rolling bearing applications. For tribological tests, a wear test device with a pin on the disc and AISI 316L stainless steel material as the counter disc material were used. The wear and friction tests were carried out under three different sliding speeds of 0.5, 1.0, and 2.0 m/s and under three different loads of 49N, 98N, and 147N. As a result of the data obtained from the study, the highest specific wear rate was obtained in ultra-high molecular weight polyethylene polymer with a sliding speed of 2 m/s and a value of 53x10-6 mm3/Nm under 49N load. The lowest specific wear rate was obtained in the pure casting polyamide polymer with a sliding speed of 1.0 m/s and a value of 4.6x10-6 mm3/Nm under 147N load. According to the test results obtained, the ultra-high molecular weight ...

Recently, application of turbocharged in internal combustion engines have increased. Most of the ... more Recently, application of turbocharged in internal combustion engines have increased. Most of the diesel engines have been covered by this application. Turbocharged can be defined as a supercharge functioning with exhaust gas. Turbocharged has two fans where one of them is on the exhaust side and the other is on suction side. In this study, performance of a turbocharged in diesel engine, made of Basak Tractors and Agricultural Machinery Industry and Trade Business in Turkey, is investigated by using the parameters. These parameters are calculated at 2500 rev/min and 370 K value of turbocharger by using Matlab programme. The good designed an intercooler with turbocharged is reduced specific fuel consumption by 3.8% and increased the effective power about 18 kW with increased rotation torque. According to these results, turbocharge with intercooler provide good performance for the engine. Also, artificial neural network analysis (ANN) is performed on effective power and specific fuel c...

Abstract With developments in technology, the dimensions of air-conditioning systems are becoming... more Abstract With developments in technology, the dimensions of air-conditioning systems are becoming smaller. Small hydraulic-diameter, multiport tubes made of extruded aluminum are used for automotive refrigerant condensers and in process industries. Condensers have been employed for heat transfer using small hydraulic-diameter tubes with rectangular shapes. This chapter investigates the results of experiments in subcooled liquid R-134a and two-phase heat transfer and friction pressure drop for R-134a in small tubes. The tubes had different rectangular ports tested at 1.26 and 2.64 mm hydraulic diameter for single-phase and two-phase flow, respectively. This chapter provides heat transfer data and pressure drop gradients at 8 kW/m 2 heat flux and 40°C for different mass velocities. In addition, data obtained from the experimental study are compared with prediction correlations and numerical analysis. The numerical analysis study was conducted for Tube C by using the ANSYS-Fluent packet program. An artificial neural network was conducted for Tube C using a back-propagation network. Results are compared in the study.

Nowadays, turbocharger application of internal combustion engine has increased. Turbocharger powe... more Nowadays, turbocharger application of internal combustion engine has increased. Turbocharger powered by exhaust gas defined as a supercharger. Turbocharger, including the turbine compressor and the suction side of the exhaust side has two propellers. The reason for modifying the turbocharger system into the internal combustion engine, it provides improvement of the engine’s performance, fuel consumption and emissions. When turbocharger application used in engine, the suction air temperature increases in the engine and this cause the emergence of undesirable combustion conditions. To reduce this situation, application of intercooling in vehicle is used. In this study, it is determined the thermal evaluation of thermodynamic calculations and the air temperatures of compressor outlet in accordance with the cycle principles of the present diesel engine tractor, made of Basak Tractors and Agricultural Machinery Industry and Trade Business in Turkey. In addition, excessive filled Turbo-Co...

Skip to Main Content. Wiley Online Library will be disrupted on 25 August from 13:00-15:00 BST (0... more Skip to Main Content. Wiley Online Library will be disrupted on 25 August from 13:00-15:00 BST (08:00-10:00 EDT) for essential maintenance. ...

Ultra-high molecular weight polyethylene (UHMWPE) polymer is widely used in medical applications ... more Ultra-high molecular weight polyethylene (UHMWPE) polymer is widely used in medical applications such as orthopedic implant in recent years due to its tensile strength, bio-compatibility, low friction coefficient, long life durability, chemical resistance and wear resistance. In addition, it is also successfully used in engineering application such as bearing material applications.1,2 These properties enable the material to be used in a range of high-tech industrial applications. Knee joints are the only solution for patients who are completely worn out and are commonly used in prosthetic applications. Prosthesis geometry and type of loading determine the size of prosthetic contact stresses and contact areas.3 On the other hand, the tribological performance of the prosthetic material is very important in applications where wear occurs. In such applications, there should be no abrasion or very low wear and the debris particles produced mustn’t be toxic. Excessive wear on prosthetic m...

e-Polymers, 2011

The wear and friction performance of GUR 1020 grade ultrahigh molecular weight polyethylene (UHMW... more The wear and friction performance of GUR 1020 grade ultrahigh molecular weight polyethylene (UHMWPE) polymer was studied in distilled water, HASS (Hank’s balanced salt solution) and several protein lubrication environments. Wear tests were carried out using polymer pin -on AISI 304L stainless steel disc apparatus. Tests conditions were room temperature, 40N, 80N and 120N applied loads and 0.5 m/s sliding speed. For the range of load and speed value of this work, the coefficient of friction and wear rate for UHMWPE polymer decreases with the increase in applied load values. The coefficient of friction is highest and the specific wear rate values is lowest under HASS +HA solution lubricant. The average specific wear rate values for UHMWPE polymer under distilled water and HASS+HA (Hank’s balanced salt solution with Hyaluronic acid) lubrication conditions are in the order of 9x10

Energy Management Handbook, Fourth Edition, 2001

International Journal of Automotive Science and Technology

In this study, the effects of surface roughness differences of vehicle coating materials (paint, ... more In this study, the effects of surface roughness differences of vehicle coating materials (paint, paste, special applications, etc.) on the aerodynamic drag coefficient were inves-tigated using the finite element method. For this, aerodynamic drag forces and aerody-namic drag coefficients for speeds between 40-150 km/hours were calculated for a 1/20 scale vehicle designed by a package program by defining the body parts and front-rear window parts separately and assigning pre-calculated roughness values suitable in the industry, and the results were presented through graphs and visuals. Using three different paint roughness values (low, medium, and high), and one commonly used Teflon (fluoropolymer) coating, it was observed that the aerodynamic resistance coefficient in-creased with increasing roughness levels. Relative to the aerodynamic resistance coeffi-cient for the lowest paint roughness value, the aerodynamic resistance coefficient for the medium roughness value showed an increa...

International Advanced Researches and Engineering Journal

In this study, the mechanical performances of neat Polyamide 6 (PA6) polymer, 20wt.% glass fiber ... more In this study, the mechanical performances of neat Polyamide 6 (PA6) polymer, 20wt.% glass fiber reinforced PA6, and 8% SEBS elastomer with 20% glass fiber reinforced PA6 composite were investigated. Composite materials were first produced in the form of granules by using a twin-screw extruder. Later, mechanical test samples were molded, in accordance with the American Society of Testing Materials (ASTM) standards, using an injection molding technique. Mechanical parameters such as tensile strength, tensile modulus, elongation at break, impact strength, flexural strength, and flexural modulus were determined by tensile, impact, and bending tests. With the addition of 20wt.% glass fiber reinforcement to the PA6 polymer matrix, properties such as tensile strength, tensile modulus, flexural strength, and flexural modulus increased, while properties such as elongation at break and impact strength decreased. For the 20% glass fiber reinforced PA6 composite with 8% SEBS rubber additive, w...

Journal of Materials and Mechatronics: A

In the automotive industry and many industries, parts are expected to meet certain requirements w... more In the automotive industry and many industries, parts are expected to meet certain requirements with regards to their tensile strength, stiffness, and high impact strength. For this reason, polypropylene homopolymer, which is a fragile polymer widely used in the automotive industry, is combined with additives to reduce its fragility. In this study, the mechanical and microstructural properties of polyolefin rubber and glass bead filled polypropylene composites have been investigated. Polypropylene (PP) was combined with polyolefin rubber (POE) and glass beads (GB) at different weight rates to create the composites and pure polypropylene was compared to the three prepared PP composites; 8% polyolefin rubber by weight, 8% glass bead by weight, and 8% polyolefin rubber and 8% glass bead by weight. The fracture surface examinations of the pure polypropylene (PP), and the polyolefin rubber added PP, glass bead added PP, and polyolefin rubber and glass bead added PP composites were carrie...

Iğdır Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 2021

Bu çalışma, elektriksel kontak kesici uygulamalarında kullanılabilecek aşınmaya dayanıklı en iyi ... more Bu çalışma, elektriksel kontak kesici uygulamalarında kullanılabilecek aşınmaya dayanıklı en iyi polimer veya polimer kompozit çiftini bulmayı hedeflemiştir. Bunun için disk üzerinde pim aşınma düzeneği kullanılmıştır. Pim malzemesi olarak katkısız poli-eter-eter-keton (PEEK) polimeri ile ağırlıkça %20 ve %30 oranında cam elyaf (CE) takviyeli PEEK kompozitleri kullanılmıştır. Karşı disk malzeme olarak ise uzun cam elyaf takviyeli ve kalsiyum karbonat mineral dolgulu doymamış polyester kompozit malzeme kullanılmıştır. Tribolojik deneylerde cam elyaf katkı oranının aşınmaya etkisi incelenmiş aynı zamanda uygulanan basıncın etkisi de araştırılmıştır. Tribolojik testler, oda sıcaklığında 1.77, 3.53 ve 5.30 MPa basınçlar altında ve 30 m/dak kayma hızında oda sıcaklığında gerçekleştirilmiştir. Elde edilen sonuçlardan, en yüksek aşınma oranı 5.30 MPa basınç altında 4.42x10-14 m2 N-1 değerine sahip PEEK+%30CE polimer kompozitinde elde edilmiştir. En düşük aşınma oranı ise 1.77 MPa basınç al...

Evaporator is one of the most energy intensive sections of a number of process industries such as... more Evaporator is one of the most energy intensive sections of a number of process industries such as pulp and paper, sugar, desalination, pharmaceuticals, dairy and food processing, etc. Single effect evaporator can be wasteful of energy if the vapor’s heat is not used. This heat can be recovered and re-used by employing multiple-effect evaporators. In this study, investigation of selection of type of evaporator using some parameters is presented for multiple effect evaporator system. Energy and economical equations are given with a case study for multiple effect evaporator system. As result of calculations, it has been found that about 3.51 of overall economy is obtained according to single evaporator.

International Journal of Automotive Science and Technology, 2021

Bumper beams and crash boxes are structural vehicle elements that have very critical functions du... more Bumper beams and crash boxes are structural vehicle elements that have very critical functions during frontal collisions. This study examined the energy ab-sorbed by the front bumper system and the reaction forces to the cage structure representing the vehicle cabin frame during a full frontal crash against a rigid wall. For this purpose, 25 different crash analyses were conducted using the ANSYS software by changing the sheet thickness values of the bumper beam (t1) and crash boxes-frontal crash rails (t2) that make up the front bumper system. The internal energy (absorbed energy) of the front bumper elements from the analysis results and the reaction forces acting on the representative cage struc-ture in the opposite direction to the movement were examined. When the ob-tained data were interpreted according to variable thickness, it was observed that the variable t2 significantly affected both the absorbed energy and reaction force results, while the variable t1 did not have a sig...

Nowadays, there are many different models of panel radiators in used heating system. Panel radiat... more Nowadays, there are many different models of panel radiators in used heating system. Panel radiator designs that have been manufactured by various producers are very similar and their products have very similar thermal efficiency and specific heating per unit weight of the radiator. In this study, CFD (code of STARCCM+) analysis of existing panel radiators were made with variable connection methods in three-dimensional space. Numerical thermal efficiency values were obtained and were compared with given catalogue values. Panel-convector-convector-panel radiator, type-22-600x500, was used as a model in this numerical study. Also, the effect of variation at air-side convective heat transfer coefficient on the thermal output was also investigated in this study. After optimum air-side convective heat transfer coefficient had been determined, numerical analyses of the panel radiator were done based on this value. For top-bottom-opposite-end connection, mass flow rate distribution is grea...

Esas olarak ekonomik gelisme, sehirlesme ve nufus artisi gibi nedenlerle enerji ihtiyaci surekli ... more Esas olarak ekonomik gelisme, sehirlesme ve nufus artisi gibi nedenlerle enerji ihtiyaci surekli artis egilimi gostermektedir. Enerji talebinin karsilanmasinda dunyada halen fosil enerji kaynaklari en buyuk orani olusturmaktadir. Fosil enerji kaynaklarinin kullanimi sonucunda basta CO2 olmak uzere sera gazi emisyonlari salinimi olusmakta, kuresel isinma ve iklim degisikligi gibi bir buyuk kuresel sorunlar ortaya cikmaktadir. Ayrica sinirli olan bu fosil kaynaklarin yakin gelecekte tukenecek olmasi gercegi surdurulebilir enerji kavramini ortaya cikarmaktadir. Buna bagli olarak, gelecek yillarda surdurulebilir enerjiye gecis insanoglunun bu yuzyilda karsilastigi onemli sorunlardan biri olarak gorulmektedir. Surdurulebilir enerji sadece gelecekteki ihtiyaclari karsilamak icin gerekli enerjinin temin edilmesi zorunlulugu olarak gorulmemektedir. Bununla birlikte; tehlikeli iklim degisikliginin onleyecek, dogal sistemlerin butunlugunu koruyacak, modern enerji bicimlerine ulasamayan insanl...

In this study, nonlinear dynamic analysis of laminated composite plates supported by springs is i... more In this study, nonlinear dynamic analysis of laminated composite plates supported by springs is investigated. Three different plate materials are selected for the analysis. Nonlinear free vibrations of laminated composite plates are studied in two different boundary conditions. These boundary conditions are free and simply supported. The classical finite element method is used for the analysis. Spring supports stiffness matrix and nonlinear stiffness matrix are developed specifically to analysis. A code of computer program with Matlab is prepared for the calculations. Effect of boundary conditions and material properties are investigated on nonlinear free vibrations of composite plate. The results are graphically presented and discussed.

In this experimental study, pure ultra-high molecular weight polyethylene (UHMWPE) and casting po... more In this experimental study, pure ultra-high molecular weight polyethylene (UHMWPE) and casting polyamide (Casting PA) polymers were used to find the best wear resistant polymer material that can be used in rolling bearing applications. For tribological tests, a wear test device with a pin on the disc and AISI 316L stainless steel material as the counter disc material were used. The wear and friction tests were carried out under three different sliding speeds of 0.5, 1.0, and 2.0 m/s and under three different loads of 49N, 98N, and 147N. As a result of the data obtained from the study, the highest specific wear rate was obtained in ultra-high molecular weight polyethylene polymer with a sliding speed of 2 m/s and a value of 53x10-6 mm3/Nm under 49N load. The lowest specific wear rate was obtained in the pure casting polyamide polymer with a sliding speed of 1.0 m/s and a value of 4.6x10-6 mm3/Nm under 147N load. According to the test results obtained, the ultra-high molecular weight ...

Recently, application of turbocharged in internal combustion engines have increased. Most of the ... more Recently, application of turbocharged in internal combustion engines have increased. Most of the diesel engines have been covered by this application. Turbocharged can be defined as a supercharge functioning with exhaust gas. Turbocharged has two fans where one of them is on the exhaust side and the other is on suction side. In this study, performance of a turbocharged in diesel engine, made of Basak Tractors and Agricultural Machinery Industry and Trade Business in Turkey, is investigated by using the parameters. These parameters are calculated at 2500 rev/min and 370 K value of turbocharger by using Matlab programme. The good designed an intercooler with turbocharged is reduced specific fuel consumption by 3.8% and increased the effective power about 18 kW with increased rotation torque. According to these results, turbocharge with intercooler provide good performance for the engine. Also, artificial neural network analysis (ANN) is performed on effective power and specific fuel c...