Person: ERZAN TOPÇU, ELİF
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ERZAN TOPÇU
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ELİF
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Publication Modeling and analysis of an electro-pneumatic brake valve with on-off type solenoid driven by pwm technique(Gazi Üniversitesi, 2021-01-01) ; Bali, Ersel; Erzan Topcu, Elif; ERZAN TOPÇU, ELİF; ; Mühendislik Fakültesi; 0000-0002-6115-3110; AAH-8319-2021In an electro-pneumatic brake valve system, the proportional flow can be provided with the proportional solenoid in a certain working area. In applications related to fluid power systems, the proportional output can also be obtained by using on-off type solenoid driven with methods such as Pulse Width Modulation (PWM) technique. In this study, the usability of the on-off type solenoid structure instead of the proportional solenoid in the electro-pneumatic brake valve was theoretically investigated. The dynamic characteristics of the designed solenoid have been modeled using finite elements and model-based design methods, and the results obtained with both methods have been found to be compatible with each other. The electro-pneumatic brake valve using an on-off type solenoid was modeled by a model-based design method in MATLAB/Simulink environment. PWM technique was applied at various frequencies determined by considering the opening and closing times of the solenoid and the proportional operating behavior of the system was examined. As a result of driving the designed structure with the PWM signal, it was seen that proportional output can be obtained from the electro-pneumatic brake valve output.Publication A numerical investigation of sloshing in a 3D prismatic tank with various baffle types, filling rates, input amplitudes and liquid materials(MDPI, 2023-02-01) Topçu, Elif Erzan; Kılıç, Eyüp; ERZAN TOPÇU, ELİF; Kılıç, Eyüp; Fen Bilimleri Enstitüsü; Makine Mühendisliği Bölümü; 0000-0002-6115-3110; AAH-8319-2021; HRL-9767-2023Partially filled liquid-carrying tanks have been used in many engineering applications, such as ships, vehicle fuel tanks, rockets, and drink or petroleum tankers. Liquid sloshing is an exciting phenomenon that researchers are investigating because of its complex behavior specifications. In this study, the sloshing responses of a prismatic tank with the approximate volume of an automobile fuel tank under different laterally harmonic excitation amplitudes, baffle structures, filling rates, and different types of liquid were investigated numerically. The computational fluid dynamics method (CFD) was used to solve fluid dynamics equations, and the volume of fluid method was applied to simulate two-phase flow in the tank. A validation study was performed by a literature study. Later, the effect of large and small excitation amplitudes, filling rates and fluid types on sloshing behavior were investigated and comparatively analyzed in the tank system with various baffle types.Publication SUV tipi bir aracın bagaj kapağı açma- kapama mekanizmasının kinematik analizi ve geogebra ile benzetiminin incelenmesi(Bursa Uludağ Üniversitesi, 2024-11-12) Topçu, Elif Erzan; Sefertaş, Sinan; ERZAN TOPÇU, ELİFBu çalışmada elektrikli pistona sahip SUV tipi bir aracın bagaj kapağı açma-kapama mekanizmasının matematiksel modellemesi yapılarak konum analizi yapılmıştır. İkinci aşamada “Geogebra” yazılımında bagaj kapağının ve pistonun temsilleri yapılarak konum analizi sonuçları karşılaştırmalı olarak incelenmiştir. Elde edilen sonuçların birbiriyle uyumlu olduğu görülmüştür. Ardından kuvvet analizi gerçekleştirilerek kapağı açmak ve kapamak için gerekli olan el kuvveti değerleri hesaplanmıştır. Bu aşamada elektrikli piston kuvveti için ölçüm sonucu elde edilen deneysel piston konum-kuvvet değerleri kullanılmıştır. Bu veriler eğri uydurma yöntemi ile fonksiyon olarak tanımlanarak el kuvveti değerinin hesaplanmasında kullanılmıştır. Bu şekilde elde edilen model ile farklı SUV araçlardaki ölçülere göre konum analizinin ve kuvvet ile ilgili değişimlerin kolaylıkla yapılabileceği görülmüştür.Publication Experimental and dynamic thermal numerical investigation of a climate test chamber(Walter de Gruyter Gmbh, 2022-05-25) Topçu, Elif Erzan; Vatansever, Barış; Nurel, Ayberk; ERZAN TOPÇU, ELİF; Makina Mühendisliği; 0000-0002-6115-3110; AAH-8319-2021In order to investigate the effects of environmental conditions on materials, industrial products or to meet long warranty periods of the products, various tests are performed in the climate test chambers. They have a multidisciplinary structure and should be designed according to different operating conditions. So obtaining the mathematical model of them and knowing the performance of dynamic behavior are significant both in the design phase and in the control of the designed system. In this study, a novel model is developed for numerical investigation of heating process of prototype climatic test due to the mentioned needs. A so-called temperature-dependent L-section line approach was developed. The insulation material was divided into seven segments. The thermal conduction coefficients of the insulation material, mass flow rate, and specific heat of the air were modeled as a function of temperature, as distinct from constant-coefficient lumped-parameter approaches. The simulation results were compared with the experimental results for different conditions, it was observed that the presented approach was compatible with the experimental results. This developed model is not only limited to climate test chambers, but can also be applied to different engineering disciplines such as control, energy, heat and mass transfer, building, and construction.