Hakan ARSLAN - Academia.edu (original) (raw)
Papers by Hakan ARSLAN
DergiPark (Istanbul University), 2018
Designing and manufacturing of an educational mode shape generator and analyzer is the main aim o... more Designing and manufacturing of an educational mode shape generator and analyzer is the main aim of this study. For this purpose, a group of undergraduate students were developed a test bench for the modal analysis of a cantilever beam. A harmonic exciter is designed and manufactured. Its name set as Ankara Yildirim Beyazit University first version or AYBU1. This exciter will used to excite a cantilever beam excite the example. The harmonic shaker is the most expensive part of such test bench. Therefore, an educational version of common harmonic shakers will be designed and produced. In this way the total price of final product shall be low as well.
Bu calismada, saglam ve hasarli durumdaki acisal temasli bilyali rulmanlarin titresimini inceleme... more Bu calismada, saglam ve hasarli durumdaki acisal temasli bilyali rulmanlarin titresimini incelemek uzere bir saft-rulman modeli olusturulmustur. Modelde saft-rulman ikilisi kutle-yay sistemi olarak modellenmis ve ilave olarak bilyalarin titresimini incelemek icin, bilyalar da kutleli olarak kabul edilmistir. Sistemin dinamik sartlar altinda dogrusal olmayan bir davranis gosterdigi bilinmektedir. Şaft ve bilyalar icin hareket denklemleri elde edilmis ve bu denklemler gelistirilen bilgisayar programi yardimiyla radyal ve eksenel yonde cozulmustur. Simulasyon programindan saft ve bilyalar icin bulunan sonuclar zaman ve frekans tanim bolgesinde incelenmis ve rulman bilyalarinin kutleli olarak kabul edilmesinin saftin genel titresimini pek fazla etkilemedigi gorulmustur. Simulasyon programi kullanilarak rulman elamanlari calisma yuzeylerindeki (ic bilezik, dis bilezik, bilya) bolgesel kusurlarin saft ve bilyalarin titresimine olan etkisi de arastirilmistir. Elde edilen sonuclar daha once...
Bu calismada, saglam ve kusurlu durumdaki bilyali rulmanlardaki bilyalarin titresimini incelemek ... more Bu calismada, saglam ve kusurlu durumdaki bilyali rulmanlardaki bilyalarin titresimini incelemek uzere bir saft-rulman modeli gelistirilmistir. Modelde saft-rulman ikilisi kutle-yay sistemi olarak, bilyalar ise kutleli olarak kabul edilmistir. Sistemin dinamik sartlar altinda dogrusal olmayan bir davranis gosterdigi bilinmektedir. Buna gore saft ve bilyalar icin radyal yondeki hareket denklemleri elde edilmis ve bu denklemler gelistirilen bilgisayar programi yardimiyla farkli on yukler icin es zamanli olarak cozulmustur. Simulasyon programindan bulunan bu sonuclar zaman ve frekans tanim bolgesinde incelenmistir. On yuk arttikca bilyalar daha uzun sure yuklu bolgede kalarak daha fazla deformasyona ugramakta ve titresim genlikleri artmaktadir. Frekans spektrumlarinda frekans zirveleri, kafes frekansi ve katlari, saftin radyal yondeki dogal frekansi ve bilyanin radyal yondeki titresim frekansinda ortaya cikmaktadir.
Bu calismada, mevcut olan titresim analizi metodu ile rulman arizalarinin belirlenmesi ele alinmi... more Bu calismada, mevcut olan titresim analizi metodu ile rulman arizalarinin belirlenmesi ele alinmistir. Rulman titresimleri, olcumu ve analizi ozet olarak verilmis, silindirik tip yuvarlanma elemanina sahip bir rulmanda olusan dis bilezik hasarinin titresim analizi ile belirlenmesi sunulmustur. Literaturde de belirtildigi gibi rulman dis bileziginde olusan tek nokta hasarinin neden oldugu titresimin dalga formu grafiginde frekansi dis bilezik bilye gecis frekansina esit olan darbe sinyalleri olustugu, spektrum grafiginde ise rulman ariza frekansinin katlarinda frekanslar olustugu belirlenmistir. Elde edilen sonuclardan, titresim analizinin rulman hasarlarini belirlemede etkili bir sekilde kullanilabilecegi gorulmustur.
Bu calismada, titresim yontemi kullanilarak radyal bilyali rulmanlardaki bolgesel yuzey kusurlari... more Bu calismada, titresim yontemi kullanilarak radyal bilyali rulmanlardaki bolgesel yuzey kusurlari deneysel olarak incelenmistir. Bu amacla bilyali rulman elemanlari (ic bilezik ve dis bilezik) calisma yuzeylerinde yapay bolgesel kusurlar olusturulmus ve radyal yondeki mil titresimleri kaydedilmistir. Sistem icin teorik bir model olusturulmus ve bu modele gore saglam ve kusurlu rulmanlari analiz edebilen bir simulasyon programi gelistirilmistir. Bu simulasyon programi, deney setinde kullanilan mil ve rulman boyutlari girilerek calistirilmis ve farkli mil hizlari icin milin titresim spektrumlari elde edilmistir. Simulasyon programindan elde edilen teorik sonuclarla deneysel sonuclar karsilastirildiginda goreceli olarak bir uyum gozlemlenmistir.
In this study, cylinder pressure changings of a 4 stroke gasoline engine were formulated as a fun... more In this study, cylinder pressure changings of a 4 stroke gasoline engine were formulated as a function of crankshaft angle. Cylinder pressure – crank angle graphs were obtained for ideal Otto cycle by using obtained equations. In the followings section, the 4 stroke engine was modeled by using 1-D numerical analysis program and pressure data acquired. The graph obtained by theoretical calculations and the other one obtained by the 1-D model were compared. The deviations of the cylinder pressure data determined by ideal system assumptions from the actual data were determined and illustrated. KeywordsCylinder pressure, Ideal Otto Cycle, 1-D Engine Model
journal of new results in science, 2018
This paper is the results of an undergraduate final term project. The aim of project was to inves... more This paper is the results of an undergraduate final term project. The aim of project was to investigate the passive noise reduction methods in mufflers. Also, another aim of this study is to examine and design mufflers with various geometries. This is learning the effect of geometry on noise transmission loss maximization performance of mufflers. Four-pole method is used to determine the noise transmission loss. Two different cross-sectional geometries are considered for the mufflers, i.e. rectangular and circular. These mufflers are produced and tested. A noise transmission test bench is used for the measurement of noise transmission loss of these mufflers. The analytical results from simulation are compared with the experimental results. The effect of geometry of mufflers on the maximization of the transmitted noise loss are investigated and reported. The results of this study can help students to learn the basics of muffler design for noise reduction applications. Furthermore, it...
Journal of Low Frequency Noise, Vibration and Active Control, 2020
This study aims to optimize the acoustic performance of a silencer with baffles having extension ... more This study aims to optimize the acoustic performance of a silencer with baffles having extension tubes. It considers the position, the number and the extension geometry of the baffles as design variables and sound transmission loss as the response variable to be optimized. The finite element analysis software ABAQUS is used to compute the response values for different combinations of design variables. The statistical design of the experiments provides a mathematical framework for such computer design optimization studies with multiple design variables. Yet, it has not been used for design optimization of silencers in the literature. In this study, simplex centroid mixture designs, a type of response surface method, are used in the statistical design of experiments. They can provide faster convergence on the optimization problem. The design involves one, two and three baffles with different positions and extension tube lengths. The outcome of this study indicates that obtaining ABAQU...
SAÜ Fen Bilimleri Enstitüsü Dergisi, 2018
Dişli çarklar güç ve hareket iletimi için endüstrinin her alanında, değişik ortam ve koşullarda k... more Dişli çarklar güç ve hareket iletimi için endüstrinin her alanında, değişik ortam ve koşullarda kullanılan makine elemanlarıdır. Makinelerin bu önemli elemanlarının zorlayıcı şartlar altında çalışması sonucu, dişilerde hasarlar meydana gelmekte ve daha büyük olumsuzlukları önleyebilmek için bu hasarların bilinmesi ve oluşum nedenlerinin tespit edilmesi gerekmektedir. Bu çalışmada amaç, dişli arızalarının sebep olduğu titreşimlerin istatistiksel proses kontrol grafiklerinde analiz edilerek düz dişli hata tespitini gerçekleştirmektir. Bu amaçla bir deney düzeneği kurulmuş, önce sağlam dişlilerin kullanılması ile farklı yükleme ve devir sayıları durumları için rulmanlı yataklar üzerinden radyal yöndeki titreşimler kaydedilerek referans spektrumları elde edilmiştir. Daha sonra sağlam dişliler üzerinde yapılan işlemlerle suni olarak aşınma ve kırık hasarları oluşturulmuştur. Düzenek çeşitli ön yük ve devir sayılarında çalıştırılarak rulman yataklarındaki titreşimler kaydedilmiştir. Bu titreşimlerin frekans spektrumları ve istatistiksel proses kontrol grafikleri çizdirilmiştir. Sağlam ve hasarlı dişli durumları için oluşturulan grafikler karşılaştırıldığında aşınmış dişli, tek dişi kırık pinyon dişli ve tek dişi kırık pinyon ve tekerlek dişli hasarlarının varlığı tespit edilebilmiştir.
The International Journal of Acoustics and Vibration, 2016
In this study, the relationship between vibration and tool wear is investigated during high-speed... more In this study, the relationship between vibration and tool wear is investigated during high-speed dry turning by using statistical parameters. It is aimed to show how tool wear and the work piece surface roughness changes with tool vibration signals. For this purpose, a series of experiments were conducted in a CNC lathe. An indexable CBN tool and a 16MnCr5 tool steel that was hardened to 63 HRC were both used as material twins in the experiments. The vibration was measured only in the machining direction using an acceleration sensor assembled on a machinery analyzer since this direction has more dominant signals than the other two directions. In addition, tool wear and work piece surface roughness are measured at different cutting time intervals where the cutting speed, radial depth of cut, and feed rate are kept constant. The vibration signals are evaluated using statistical analysis. The statistical parameters in this study are the Root Mean Square (RMS), Crest Factor, and Kurtosis values. When the flank wear increases, the Kurtosis value and RMS also increase, but the Crest factor exhibited irregular variations. It is concluded that these statistical parameters can be used in order to obtain information about tool wear and work piece surface roughness.
ABSTRACT It is very important structures must run without defects as soon as possible, since defe... more ABSTRACT It is very important structures must run without defects as soon as possible, since defects influence in a negative way the service life of the structures. Thus, defect detection has been considerable effort. In this study, dynamical behaviour of the a cantilever beam having a hole, has been evaluated. Two kind of on brass beams were investigated. One of them is compound of 63 %Cu, 27%Zn, the other is compound of 70 %Cu, 30%Zn. For this purpose, the vibrations as a result of impact shocks were analyzed. The signals obtained in defect-free and holed beams were compared in the frequency domain.
Gears are machine elements used extensively in many areas of industry to transmit power and motio... more Gears are machine elements used extensively in many areas of industry to transmit power and motion. Damage occurs due to working under compulsive conditions and effective gear fault detection is crucial to prevent greater drawbacks and economic losses. Vibration analysis is one of the most important methods that given idea about the possible damages which occur at structural elements of machines. As a result; nowadays gear fault diagnosis is carried out based on the vibration measurement and analysis. Gear fault detection is performed by analyzing of the vibration test results using signal processing, artificial intelligence and statistical analysis methods. The objective of this study is determination of the availability of statistical process control method in the spur gear fault detection. In this method, upper and lower control limits are determined by using mean and standard deviation values of vibration data of un-deformed gear. If data points obtained from gear vibration test...
Journal of Tribology, 2008
In this paper, a shaft-bearing model is developed in order to investigate the rolling element vib... more In this paper, a shaft-bearing model is developed in order to investigate the rolling element vibrations for an angular contact ball bearing with and without defects. The shaft-bearing assembly is considered as a mass-spring system. The system shows a nonlinear characteristic under dynamic conditions. The equations of motion in radial and axial directions were obtained for shaft and rolling elements, and they were solved simultaneously with a computer simulation program. Additionally, the effect of localized defects on running surfaces (i.e., inner ring, outer ring, and ball) on the vibration of the balls is investigated. Vibration of rolling elements in the radial direction is analyzed in time and frequency domains. Characteristic defect frequencies and their components can be seen in the frequency spectra of rolling element vibrations. Comparison of the obtained results with similar studies available in literature showed reasonable qualitative agreement.
DergiPark (Istanbul University), 2018
Designing and manufacturing of an educational mode shape generator and analyzer is the main aim o... more Designing and manufacturing of an educational mode shape generator and analyzer is the main aim of this study. For this purpose, a group of undergraduate students were developed a test bench for the modal analysis of a cantilever beam. A harmonic exciter is designed and manufactured. Its name set as Ankara Yildirim Beyazit University first version or AYBU1. This exciter will used to excite a cantilever beam excite the example. The harmonic shaker is the most expensive part of such test bench. Therefore, an educational version of common harmonic shakers will be designed and produced. In this way the total price of final product shall be low as well.
Bu calismada, saglam ve hasarli durumdaki acisal temasli bilyali rulmanlarin titresimini inceleme... more Bu calismada, saglam ve hasarli durumdaki acisal temasli bilyali rulmanlarin titresimini incelemek uzere bir saft-rulman modeli olusturulmustur. Modelde saft-rulman ikilisi kutle-yay sistemi olarak modellenmis ve ilave olarak bilyalarin titresimini incelemek icin, bilyalar da kutleli olarak kabul edilmistir. Sistemin dinamik sartlar altinda dogrusal olmayan bir davranis gosterdigi bilinmektedir. Şaft ve bilyalar icin hareket denklemleri elde edilmis ve bu denklemler gelistirilen bilgisayar programi yardimiyla radyal ve eksenel yonde cozulmustur. Simulasyon programindan saft ve bilyalar icin bulunan sonuclar zaman ve frekans tanim bolgesinde incelenmis ve rulman bilyalarinin kutleli olarak kabul edilmesinin saftin genel titresimini pek fazla etkilemedigi gorulmustur. Simulasyon programi kullanilarak rulman elamanlari calisma yuzeylerindeki (ic bilezik, dis bilezik, bilya) bolgesel kusurlarin saft ve bilyalarin titresimine olan etkisi de arastirilmistir. Elde edilen sonuclar daha once...
Bu calismada, saglam ve kusurlu durumdaki bilyali rulmanlardaki bilyalarin titresimini incelemek ... more Bu calismada, saglam ve kusurlu durumdaki bilyali rulmanlardaki bilyalarin titresimini incelemek uzere bir saft-rulman modeli gelistirilmistir. Modelde saft-rulman ikilisi kutle-yay sistemi olarak, bilyalar ise kutleli olarak kabul edilmistir. Sistemin dinamik sartlar altinda dogrusal olmayan bir davranis gosterdigi bilinmektedir. Buna gore saft ve bilyalar icin radyal yondeki hareket denklemleri elde edilmis ve bu denklemler gelistirilen bilgisayar programi yardimiyla farkli on yukler icin es zamanli olarak cozulmustur. Simulasyon programindan bulunan bu sonuclar zaman ve frekans tanim bolgesinde incelenmistir. On yuk arttikca bilyalar daha uzun sure yuklu bolgede kalarak daha fazla deformasyona ugramakta ve titresim genlikleri artmaktadir. Frekans spektrumlarinda frekans zirveleri, kafes frekansi ve katlari, saftin radyal yondeki dogal frekansi ve bilyanin radyal yondeki titresim frekansinda ortaya cikmaktadir.
Bu calismada, mevcut olan titresim analizi metodu ile rulman arizalarinin belirlenmesi ele alinmi... more Bu calismada, mevcut olan titresim analizi metodu ile rulman arizalarinin belirlenmesi ele alinmistir. Rulman titresimleri, olcumu ve analizi ozet olarak verilmis, silindirik tip yuvarlanma elemanina sahip bir rulmanda olusan dis bilezik hasarinin titresim analizi ile belirlenmesi sunulmustur. Literaturde de belirtildigi gibi rulman dis bileziginde olusan tek nokta hasarinin neden oldugu titresimin dalga formu grafiginde frekansi dis bilezik bilye gecis frekansina esit olan darbe sinyalleri olustugu, spektrum grafiginde ise rulman ariza frekansinin katlarinda frekanslar olustugu belirlenmistir. Elde edilen sonuclardan, titresim analizinin rulman hasarlarini belirlemede etkili bir sekilde kullanilabilecegi gorulmustur.
Bu calismada, titresim yontemi kullanilarak radyal bilyali rulmanlardaki bolgesel yuzey kusurlari... more Bu calismada, titresim yontemi kullanilarak radyal bilyali rulmanlardaki bolgesel yuzey kusurlari deneysel olarak incelenmistir. Bu amacla bilyali rulman elemanlari (ic bilezik ve dis bilezik) calisma yuzeylerinde yapay bolgesel kusurlar olusturulmus ve radyal yondeki mil titresimleri kaydedilmistir. Sistem icin teorik bir model olusturulmus ve bu modele gore saglam ve kusurlu rulmanlari analiz edebilen bir simulasyon programi gelistirilmistir. Bu simulasyon programi, deney setinde kullanilan mil ve rulman boyutlari girilerek calistirilmis ve farkli mil hizlari icin milin titresim spektrumlari elde edilmistir. Simulasyon programindan elde edilen teorik sonuclarla deneysel sonuclar karsilastirildiginda goreceli olarak bir uyum gozlemlenmistir.
In this study, cylinder pressure changings of a 4 stroke gasoline engine were formulated as a fun... more In this study, cylinder pressure changings of a 4 stroke gasoline engine were formulated as a function of crankshaft angle. Cylinder pressure – crank angle graphs were obtained for ideal Otto cycle by using obtained equations. In the followings section, the 4 stroke engine was modeled by using 1-D numerical analysis program and pressure data acquired. The graph obtained by theoretical calculations and the other one obtained by the 1-D model were compared. The deviations of the cylinder pressure data determined by ideal system assumptions from the actual data were determined and illustrated. KeywordsCylinder pressure, Ideal Otto Cycle, 1-D Engine Model
journal of new results in science, 2018
This paper is the results of an undergraduate final term project. The aim of project was to inves... more This paper is the results of an undergraduate final term project. The aim of project was to investigate the passive noise reduction methods in mufflers. Also, another aim of this study is to examine and design mufflers with various geometries. This is learning the effect of geometry on noise transmission loss maximization performance of mufflers. Four-pole method is used to determine the noise transmission loss. Two different cross-sectional geometries are considered for the mufflers, i.e. rectangular and circular. These mufflers are produced and tested. A noise transmission test bench is used for the measurement of noise transmission loss of these mufflers. The analytical results from simulation are compared with the experimental results. The effect of geometry of mufflers on the maximization of the transmitted noise loss are investigated and reported. The results of this study can help students to learn the basics of muffler design for noise reduction applications. Furthermore, it...
Journal of Low Frequency Noise, Vibration and Active Control, 2020
This study aims to optimize the acoustic performance of a silencer with baffles having extension ... more This study aims to optimize the acoustic performance of a silencer with baffles having extension tubes. It considers the position, the number and the extension geometry of the baffles as design variables and sound transmission loss as the response variable to be optimized. The finite element analysis software ABAQUS is used to compute the response values for different combinations of design variables. The statistical design of the experiments provides a mathematical framework for such computer design optimization studies with multiple design variables. Yet, it has not been used for design optimization of silencers in the literature. In this study, simplex centroid mixture designs, a type of response surface method, are used in the statistical design of experiments. They can provide faster convergence on the optimization problem. The design involves one, two and three baffles with different positions and extension tube lengths. The outcome of this study indicates that obtaining ABAQU...
SAÜ Fen Bilimleri Enstitüsü Dergisi, 2018
Dişli çarklar güç ve hareket iletimi için endüstrinin her alanında, değişik ortam ve koşullarda k... more Dişli çarklar güç ve hareket iletimi için endüstrinin her alanında, değişik ortam ve koşullarda kullanılan makine elemanlarıdır. Makinelerin bu önemli elemanlarının zorlayıcı şartlar altında çalışması sonucu, dişilerde hasarlar meydana gelmekte ve daha büyük olumsuzlukları önleyebilmek için bu hasarların bilinmesi ve oluşum nedenlerinin tespit edilmesi gerekmektedir. Bu çalışmada amaç, dişli arızalarının sebep olduğu titreşimlerin istatistiksel proses kontrol grafiklerinde analiz edilerek düz dişli hata tespitini gerçekleştirmektir. Bu amaçla bir deney düzeneği kurulmuş, önce sağlam dişlilerin kullanılması ile farklı yükleme ve devir sayıları durumları için rulmanlı yataklar üzerinden radyal yöndeki titreşimler kaydedilerek referans spektrumları elde edilmiştir. Daha sonra sağlam dişliler üzerinde yapılan işlemlerle suni olarak aşınma ve kırık hasarları oluşturulmuştur. Düzenek çeşitli ön yük ve devir sayılarında çalıştırılarak rulman yataklarındaki titreşimler kaydedilmiştir. Bu titreşimlerin frekans spektrumları ve istatistiksel proses kontrol grafikleri çizdirilmiştir. Sağlam ve hasarlı dişli durumları için oluşturulan grafikler karşılaştırıldığında aşınmış dişli, tek dişi kırık pinyon dişli ve tek dişi kırık pinyon ve tekerlek dişli hasarlarının varlığı tespit edilebilmiştir.
The International Journal of Acoustics and Vibration, 2016
In this study, the relationship between vibration and tool wear is investigated during high-speed... more In this study, the relationship between vibration and tool wear is investigated during high-speed dry turning by using statistical parameters. It is aimed to show how tool wear and the work piece surface roughness changes with tool vibration signals. For this purpose, a series of experiments were conducted in a CNC lathe. An indexable CBN tool and a 16MnCr5 tool steel that was hardened to 63 HRC were both used as material twins in the experiments. The vibration was measured only in the machining direction using an acceleration sensor assembled on a machinery analyzer since this direction has more dominant signals than the other two directions. In addition, tool wear and work piece surface roughness are measured at different cutting time intervals where the cutting speed, radial depth of cut, and feed rate are kept constant. The vibration signals are evaluated using statistical analysis. The statistical parameters in this study are the Root Mean Square (RMS), Crest Factor, and Kurtosis values. When the flank wear increases, the Kurtosis value and RMS also increase, but the Crest factor exhibited irregular variations. It is concluded that these statistical parameters can be used in order to obtain information about tool wear and work piece surface roughness.
ABSTRACT It is very important structures must run without defects as soon as possible, since defe... more ABSTRACT It is very important structures must run without defects as soon as possible, since defects influence in a negative way the service life of the structures. Thus, defect detection has been considerable effort. In this study, dynamical behaviour of the a cantilever beam having a hole, has been evaluated. Two kind of on brass beams were investigated. One of them is compound of 63 %Cu, 27%Zn, the other is compound of 70 %Cu, 30%Zn. For this purpose, the vibrations as a result of impact shocks were analyzed. The signals obtained in defect-free and holed beams were compared in the frequency domain.
Gears are machine elements used extensively in many areas of industry to transmit power and motio... more Gears are machine elements used extensively in many areas of industry to transmit power and motion. Damage occurs due to working under compulsive conditions and effective gear fault detection is crucial to prevent greater drawbacks and economic losses. Vibration analysis is one of the most important methods that given idea about the possible damages which occur at structural elements of machines. As a result; nowadays gear fault diagnosis is carried out based on the vibration measurement and analysis. Gear fault detection is performed by analyzing of the vibration test results using signal processing, artificial intelligence and statistical analysis methods. The objective of this study is determination of the availability of statistical process control method in the spur gear fault detection. In this method, upper and lower control limits are determined by using mean and standard deviation values of vibration data of un-deformed gear. If data points obtained from gear vibration test...
Journal of Tribology, 2008
In this paper, a shaft-bearing model is developed in order to investigate the rolling element vib... more In this paper, a shaft-bearing model is developed in order to investigate the rolling element vibrations for an angular contact ball bearing with and without defects. The shaft-bearing assembly is considered as a mass-spring system. The system shows a nonlinear characteristic under dynamic conditions. The equations of motion in radial and axial directions were obtained for shaft and rolling elements, and they were solved simultaneously with a computer simulation program. Additionally, the effect of localized defects on running surfaces (i.e., inner ring, outer ring, and ball) on the vibration of the balls is investigated. Vibration of rolling elements in the radial direction is analyzed in time and frequency domains. Characteristic defect frequencies and their components can be seen in the frequency spectra of rolling element vibrations. Comparison of the obtained results with similar studies available in literature showed reasonable qualitative agreement.