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Öğe Dynamic analysis of uniform and non-uniform cross-section cantilever sandwich beams(INESEG Yayıncılık, 2019) Hüseyinoğlu, Mesut; Şen, Murat; Yiğid, Osman; Çakar, OrhanIn this study, an analytical solution for dynamic analysis of uniform and nonuniformcross-section cantilever sandwich beam is presented. The sandwichbeam was assumed to be an Euler-Bernoulli beam and formed with a thin coreand two thin skin layers. So the shear deformations and rotational effects wereneglected. The equivalent flexural rigidity was obtained for the entiresandwich structure. Some implementations for the solution method are givenand the results are compared with numerical solutions. The usability of theEuler-Bernoulli Beam Theory for thin layered uniform or non-uniformsandwich beams is investigated. The solutions obtained from analytical andnumerical solutions are in good agreement.Öğe DYNAMIC ANALYSIS OF UNIFORM AND NON-UNIFORM CROSS-SECTION CANTILEVER SANDWICH BEAMS(Hibetullah KILIÇ, 2019) Hüseyinoğlu, Mesut; Şen, Murat; Yiğid, Osman; Çakar, OrhanIn this study, an analytical solution for dynamic analysis of uniform and non-uniform cross-section cantilever sandwich beam is presented. The sandwich beam was assumed to be an Euler-Bernoulli beam and formed with a thin core and two thin skin layers. So the shear deformations and rotational effects were neglected. The equivalent flexural rigidity was obtained for the entire sandwich structure. Some implementations for the solution method are given and the results are compared with numerical solutions. The usability of the Euler-Bernoulli Beam Theory for thin layered uniform or non-uniform sandwich beams is investigated. The solutions obtained from analytical and numerical solutions are in good agreement.Öğe DYNAMIC MODEL AND CONTROL OF 2-DOF ROBOTIC ARM(2018) Hüseyinoğlu, Mesut; Abut, TayfunRobotic is a relatively young field of modern technology that exceedstraditional engineering boundaries. Control of the robots is important due tothe fact that it has a usage area in many areas. In this study, modelling andcontrol of two degrees of freedom (2-DOF) robotic arm were carried out.Lagrange-Euler method was used to obtain the dynamic equations of therobot. The system was controlled in the simulation environment. Sliding-ModeControl (SMC) and Proportional-Integral-Derivative (PID) control methodswere proposed to control the 2 DOF robotic arm. The saturation function isused for the chattering problem of the sliding mode control method. Bothprocess noise and measurement noise have been applied to control the robotin conditions close to the actual ambient conditions. The control methodsapplied according to the results of the simulation environment were comparedand the results were examined.Öğe İşe alım süreçlerinde aşamalı olarak TOPSIS ve VIKOR yöntemleri uygulanarak iş gören seçimi yapılması(Dicle Üniversitesi Mühendislik Fakültesi, 2023) Aslan, Abdulbari; Hüseyinoğlu, Mesut; Budak, CaferDeğişen ve gelişen dünyada kurumların daha rekabetçi ve sürdürülebilir yönetim süreçlerinde karar verme oldukça önemli bir yer edinmiştir. Son 80 yılda tamamen sistemli bir disiplin ve model halini alan karar verme bilimi tüm organizasyon ve yaşam alanlarına yön vermeye devam etmektedir. Tüm şirketler için hayati bir öneme sahip olan ve gittikçe daha da önem kazanan çalışan etmeni ve çalışan seçimi de karar verme modelleri ile yönetilmeye başlanmıştır. Bu çalışmada öncelikle karar verme modelleri hakkında bilgiler sunulmuştur. Daha sonra Çok Kriterli Karar Verme (ÇKKV) modellerinden TOPSIS yöntemi kullanılarak iş başvurusu yapan 8 adaydan 4 kişilik mülakat listesi oluşturulmuştur. Son olarak seçilen adaylar içinden en uygun adayı tercih etmek için VIKOR yöntemi uygulanmış ve başarılı sonuçlar elde edilmiştir.Öğe A method for substructure decoupling of mechanical systems by using frequency response functions(Springer Science and Business Media Deutschland GmbH, 2024) Hüseyinoğlu, MesutThe need for modification in many mechanical systems occurs due to the parameters that are not taken into account during the design process and the changes made on the main structure. This can be in the form of removing a substructure from the main structure. Although the dynamic properties of the main structure are known, it is important to know what the dynamic properties of the new structure will be formed by the substructure removed from the main structure. In this study, a method for substructure decoupling of mechanical systems based on the Sherman–Morrison formula is presented. The frequency response functions (FRFs) of the main structure relating to the decoupling coordinates are directly used in the developed method. The main highlight of the presented method is needed neither a physical model nor a modal model, since FRFs are directly used. It is also more useful than methods using modal properties, since a limited number of FRFs are used for decoupling coordinates.Öğe A method for the assignment of zeros using frequency response functions(Springer Heidelberg, 2024) Hüseyinoğlu, MesutPurposeIn many engineering structures, undesirable harmonics can occur due to changes in operating conditions. The effects of these unwanted harmonics can be eliminated by assigning the zeros of point or cross Frequency Response Functions (FRFs) of the structure to the frequencies of the unwanted harmonics. In this study, a method is proposed for assigning the zeros of point or cross FRFs to particular frequencies.MethodsThe method is based on Sherman-Morrison (SM) formula known in matrix theory. The inverse structural modification problem was investigated by making spring modifications on a structure to assign zeros.ResultsThe required modifications are calculated by solving the set of equations containing nonlinear combinations of the spring coefficients.ConclusionThere is no need for a physical or modal model of the structure because FRFs are used directly in the method. Therefore, it is quite practical in applications. The accuracy and efficiency of the presented method are illustrated by different numerical simulations and successful results are obtained.Öğe Modal Analysis of a Clamped-Clamped U Frame Structure(Muş Alparslan Üniversitesi, 2019) Hüseyinoğlu, Mesut; Abut, TayfunDetermining of dynamic behaviours of the many machine elements used in the industry is an important issue in terms of the safe operation of the structure and the performance of the machine. Modal analysis method is widely used to determine the dynamic properties of the structures. In this study, theoretical and experimental modal analyses of a clamped-clamped U frame. Theoretical modal analysis is performed using ANSYS programme. Experimental modal analysis is performed with OROS Or36 vibration analyser and OROS modal analysis software. The results obtained from experimental and theoretical studies were compared and it was found that the model created in ANSYS successfully represented the experimental model.Öğe Model predictive trajectory tracking control of 2 DoFs SCARA robot under external force acting to the tip along the trajectory(Dicle Üniversitesi Mühendislik Fakültesi, 2023) Kara, Sertaç Emre; Yiğid, Osman; Şen, Murat; Hüseyinoğlu, MesutThe robot arms often follow a certain trajectory depending on the type of end effector with functions of spray-painting, arc welding, bonding or machining etc. Therefore, trajectory-tracking control is a very important issue in robot arm applications. Also, the robot must be able to follow the determined trajectory stably under the influence of external forces or machining forces it encounters in its operations. In this study, a Model Predictive Control (MPC) for trajectory tracking control of a 2 Degrees of Freedom (DoFs) Selective Compliant Assembly Robot Arm (SCARA) under an external force acting to the tip of the robot along the trajectory was performed. The effectiveness of the MPC method used has been demonstrated by simulation applications. According to simulation studies, successful results were obtained.Öğe Obtaining Critical Buckling Load of a Cantilever Beam by Using Measured Natural Frequencies(Batman Üniversitesi, 2019) Şen, Murat; Hüseyinoğlu, Mesut; Çakar, OrhanIn this study, buckling critical loads are calculated by using natural frequency values of the first 4 modes obtained by performing experimental modal analysis (EMA) of a uniform cantilever beam. The analytical results are presented with the experimental results comparatively. According to the results it can be said that the vibration data can be used to determine the critical buckling loads of the beams. So there is no need any buckling tests that cause deformation in the test structures or analytical and numerical solutions that need mechanical properties of the beam for obtaining buckling loads.Öğe Tepki yüzey modeli ve genetik algoritma kullanılarak AISI 316’ nın delinmesinde oluşan çapak yüksekliğinin modellenmesi ve optimizasyonu(Dicle Üniversitesi Mühendislik Fakültesi, 2010) Kılıçkap, Erol; Hüseyinoğlu, Mesutİmalat sektöründe tam otomatik cihazların kullanımının yaygınlaşması ile birlikte üretim sürecinin modellenmesi büyük önem kazanmıştır. Bununla birlikte optimum üretim şartlarının belirlenmesi, üretimin gelişimi ve ürün kalitesi için önemli bir rol oynamaktadır. Bu çalışmanın amacı, minimum çapak yüksekliğini belirlemede optimum delme parametrelerini bulmak için Tepki yüzey modeli ve Genetik algoritma kullanarak sistematik bir prosedür ortaya koymaktır. Optimum üretim için, üç-düzeyli üç faktörlü tam deneysel tasarım, Tepki Yüzey Yöntemi ve Genetik Algoritma kullanılmaktadır. Delme işlemleri üç ilerleme hızı (0.1, 0.2 ve 0.3 mm/dev), üç kesme hızı (4, 8 ve 12 m/dak) ve farklı uç açısına (90°, 118° ve 135°) sahip HSS matkap takımları kullanılarak yapıldı. Deneyler Box Behnken tasarımı dikkate alınarak yapıldı. Tepki yüzey metodolojisi kullanılarak çapak yüksekliği için bir matematiksel tahmin modeli geliştirilmiştir. Bu matematiksel tahmin modelinden faydalanılarak minimum çapak yüksekliği için optimum delme parametrelerini belirlemede Genetik algoritma kullanıldı. Genetik algoritma optimizasyon sonuçlarında minimum çapak yüksekliğinin 4 m/dak kesme hızı, 0.1 mm/dev ilerleme hızı ve 135° uç açısında oluştuğu görüldü.
