Person: YENİKAYA, SİBEL
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YENİKAYA
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SİBEL
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Publication Design optimization using dielectric slab for efficient microwave heating(Tubitak Scientific & Technological Research Council Turkey, 2019-01-01) Yenikaya, Sibel; Yenikaya, Sibel; YENİKAYA, SİBEL; Mekonnen, Sofiya Ali; Mühendislik Fakültesi; 0000-0001-9276-9463In this paper, usage of a dielectric slab on the top and bottom sides, on the top side, and on the bottom side of a clay sample was presented as a means of improving heating efficiency in multimode applicator. In order to accomplish the optimization procedure, we used four different dielectric slab types having different thickness values. The simulated results show that by using additional dielectric slab it is possible to increase the electric field intensity inside the applicator and obtain higher power absorption rates within the sample and high-efficiency designs.Publication Analysis, design, and actual fabrication of a hybrid microstrip-siw bandpass filter based on cascaded hardware integration at x-band(Kaunas Univ Technology, 2021-01-01) Seçmen, Mustafa; Güvenli, Kemal; Yenikaya, Sibel; YENİKAYA, SİBEL; Mühendislik Fakültesi; Elektrik ve Elektronik Mühendisliği Bölümü; 0000-0002-7656-4051In this paper, the Microstrip-Substrate Integrated Waveguide (M-SIW) bandpass filter is designed, simulated, and fabricated based on the theoretical analysis. The Substrate Integrated Waveguide (SIW) highpass filter and the microstrip lowpass filter are combined in a hybrid design to achieve the M-SIW bandpass filter in the X-band. This design is more comprehensible and easier to achieve a bandpass filter at a desired frequency. The SIW highpass filter and the microstrip lowpass filter are connected in series to achieve the bandpass filter. To the measured results of the fabricated M-SIW bandpass filter, the center frequency is 10.20 GHz and the bandwidth is 2.40 GHz. When the analytical and measurement results are compared, the frequency change in the cut-off frequency is 6.02 % and the frequency change in the bandwidth is 8.74 % It is generally seen that analytical, simulation, and measurement results are compatible with each other. The M-SIW bandpass filter can be broadly used in radar, Worldwide Interoperability for Microwave Access (WiMAX), and satellite technologies. The filters are simulated in Computer Simulation Technology (CST) Studio Suite.Publication Analysis of shielding effectiveness by optimizing aperture dimensions of a rectangular enclosure with genetic algorithm(Tübitak Bilimsel ve Teknolojik Araştırma Kurumu, 2021-01-01) Güler, Sunay; Yenikaya, Sibel; Güler, Sunay; YENİKAYA, SİBEL; Mühendislik Fakültesi; Elektrik Elektronik Mühendisliği Bölümü; 0000-0003-3851-3357; ABC-7977-2021; EEJ-1855-2022Electromagnetic compatibility (EMC) has now become a substantial challenge more than any other time since the number of electric vehicles (EV) increased rapidly. The electric driving system in an EV consists of power electronic components supplied by high voltage battery source. They are both source and victim of potential electromagnetic interference (EMI) since fast switching process occurs inside them. Electromagnetic shielding provides a significant protection against EMI for any electrical and electronic components inside the vehicle. In this paper, analysis of shielding effectiveness (SE) by optimizing aperture dimensions of a rectangular enclosure is investigated. Realistic dimensions of the shielding enclosure of an inverter component are employed. An optimization methodology based on genetic algorithm (GA) is carried out and applied to an SE analytical model. It is aimed to keep the total aperture area as large as possible inside a particular dimension range while improving SE of the enclosure compared with the reference level. Obtained optimization results are presented by indicating optimum aperture length and width which satisfy both EMC and dimension requirements. Finally, it is concluded that through the optimization methodology designed in this study, the SE of the enclosure is raised from a poor level to an average one while providing larger aperture area.Publication Emc design for battery electric vehicle (bev) propulsion system(Ieee, 2019-01-01) Güler, Sunay; Şimsek, Mustafa; Yenikaya, Sibel; YENİKAYA, SİBEL; Mühendislik Fakültesi; Elektrik Elektronik Mühendisliği BölümüRecently, Battery Electric Vehicle (BEV) became a popular research and development area due to new regulations which aim CO2-free transportation and emission limitations by governments. The integration of electric propulsion systems, that basically consist of high-voltage battery unit, inverter, e-machine, charger, DC/DC converter, into today's cars represents a substantial challenge. Due to having High Voltage (HV) wiring harness and components inside BEV, EMC takes its place as a crucial point that must be investigated. In this paper, the authors show an image of electromagnetic environment of BEV propulsion system. Analysis and design of the propulsion system with practical techniques are represented for reducing the electromagnetic interference.Publication Improving the shielding effectiveness of a rectangular enclosure by optimizing aperture and coating with graphene sheet(Taylor, 2022-07-09) Güler, Sunay; Yenikaya, Sibel; YENİKAYA, SİBEL; Mühendislik Fakültesi; Elektrik Elektronik Mühendisliği Bölümü; EEJ-1855-2022Incorporating an electric propulsion system into conventional vehicle electronic architecture makes electromagnetic compatibility (EMC) become one of the most important issues during electric vehicle design. Electromagnetic shielding is one of the compulsory preventions to protect electronic circuits against electromagnetic interference (EMI). However, apertures of the shielding enclosure reduce shielding effectiveness (SE) by permitting EMI leakage to affect the electronic circuits. When the dimensions of the enclosure remain fixed and the aperture has a particular area, studies such as optimization of the aperture dimensions or changing the enclosure material are essential. In this study, a genetic algorithm (GA) is designed initially, which improves SE by determining aperture dimensions on the front surface of the shielding enclosure. Then, obtained aperture dimensions are used in a numerical model in which the inner surfaces of the enclosure are coated with graphene sheets. It is observed that SE simulation results are in good agreement with measurement ones.Publication Microwave drying of automotive industry paint sludge(Asce-Amer Soc Civil Engineers, 2018-10-01) Yenikaya, Sibel; Salihoğlu, Güray; Salihoğlu, Nezih Kamil; Yenikaya, Gökhan; YENİKAYA, SİBEL; SALİHOĞLU, GÜRAY; SALİHOĞLU, NEZİH KAMİL; YENİKAYA, GÖKHAN; Mühendislik Fakültesi; Çevre Mühendisliği Bölümü; 0000-0003-0714-048X; AAG-9399-2021; AAG-9413-2021; KIE-8936-2024; EEJ-1855-2022The moisture content of process sludges generated by industries is an important problem affecting the cost and convenience of sludge management. Sludge can be dried to decrease its volume and reduce most of the moisture. This research analyzes the microwave drying process of water-based paint sludge from the automotive industry by investigating the influence of dielectric constant, sludge form (raw or ground), drying method (microwave and conventional), drying period, and air curing, and by conducting numerical modeling. The drying period of sewage sludge is also analyzed for comparison. The moisture losses range between 8 and 12% and between 26 and 31% for 5 and 10min microwave drying periods, respectively. The moisture losses obtained with conventional heating range between 0.2 and 1.2% and between 0.7 and 2.9% for 5 and 10min drying, respectively. Air curing of the samples following microwave drying results in a 3% increase in the moisture losses. Numerical modeling results show that the dielectric characteristics of the paint sludge might change during the drying process inside the oven and different chemical compositions of the sludges might lead to temperature changes during the drying process. By modeling the microwave oven, it is possible to determine the regions that can dissipate more heat without measuring, which is confirmed with the dissipated power density maps and electric field distribution obtained.Publication Parametric study on shielding effectiveness of graphene based bilayer structure(Pamukkale Üniversitesi, 2023-01-01) Güler, Sunay; Yenikaya, Sibel; YENİKAYA, SİBEL; Mühendislik Fakültesi; Elektrik Elektronik Mühendisliği Bölümü; 0000-0003-3851-3357; EEJ-1855-2022In this study, it is aimed to increase shielding effectiveness of electromagnetic shields by coating with graphene sheet. Firstly, graphene monolayer is modeled numerically and it is observed that it is in good agreement with the analytical findings. Then, the reflection loss of bilayer screen that is formed by coating the back surface of an aluminum plate with graphene sheet, is analyzed analytically and numerically. Finally, a shielding enclosure in which inner surfaces are coated with graphene sheet is modeled and the change of shielding effectiveness of the shielding enclosure with respect to the chemical potential and temperature values of graphene sheet is investigated. It is obtained that shielding effectiveness of shielding enclosure decays depending on the increase of chemical potential of graphene sheet while the temperature parameter remains fixed. Shielding effectiveness values are obtained close to each other at the temperature 300 K and above depending on the increase of temperature of graphene sheet while the chemical potential remains fixed.Publication A parallel connected hybrid microstrip-substrate integrated waveguide bandstop filter(Kaunas Univ Technology, 2023-01-01) Güvenli, Kemal; Seçmen, Mustafa; Yenikaya, Sibel; YENİKAYA, SİBEL; Mühendislik Fakültesi; Elektrik ve Elektronik Mühendisliği BölümüThis study presents an original parallel connected hybrid microstrip-substrate integrated waveguide (PCHMSIW) bandstop filter. A low-pass filter implemented on a microstrip structure and a SIW-based high-pass filter are connected in parallel to each other. In this way, the aim is to obtain a bandstop filter in the novel hybrid design. The parallel connected hybrid microstrip-substrate integrated waveguide (PCHM-SIW) bandstop filter is synthesised, simulated, and produced. The effects of connecting filters in parallel are discussed. It is seen from the results of CST Studio Suite simulation that PCHM-SIW bandstop filter has a bandwidth of 2.85 GHz and a center frequency of 4.26 GHz. The frequency change rate of the center frequency between simulation and measurement is 7.02 % where it is just 3.76 % for the deviation in bandwidth. The results of the simulation and those of the measurement are close to each other. These results converge to ideal analytical results.Publication Numerical and experimental analysis of the heating performance of a microwave applicator loaded with sludge material(Asce-amer Soc Civil Engineers, 2018-10-01) YENİKAYA, SİBEL; YENİKAYA, GÖKHAN; Mekonnen, Sofiya Ali; Mühendislik Fakültesi; Elektrik ve Elektronik Mühendisliği Bölümü; 0000-0001-9276-9463; KIE-8936-2024The performance of a microwave applicator loaded with a lossy dielectric sludge material is affected by several factors. In this study, the effect of the geometry, properties, and position of the sludge material load inside the oven on the microwave heating efficiency and electric field distribution were investigated numerically and experimentally. Electric field distribution was simulated for different load geometries, dielectric values, and positions of the sample in different locations inside the oven. The temperature distributions on the sludge samples were experimentally measured and found compatible with the simulation results, which show that the electric field distribution and efficiency of the system are greatly affected. In addition, we found the optimal location to improve the performance of the microwave applicator.Publication An efficient hybrid mom/fem method for analyzing the enclosures with apertures(Pamukkale Üniversitesi, 2011-01-01) Yenikaya, Sibel; YENİKAYA, SİBEL; Mühendislik ve Mimarlık Bölümü; EEJ-1855-2022In this paper a hybrid formulation is presented which combines edge-based vector finite method (FEM) and Method of Moments (MoM) in frequency domain to predict electromagnetic field distribution inside an enclosure with aperture. While MoM is used for solving the surface integrals related with the aperture field components via equivalent surface currents, FEM is used for solving electromagnetic fields inside of the enclosure. Numerical results for shielding effectiveness and electrical energy of enclosure with aperture a re calculated by the hybrid method and they are presented and validated with the existing literature. Then the method is applied to different enclosures with different aperture sizes.