Yazar "Kose, Ercan" seçeneğine göre listele
Listeleniyor 1 - 11 / 11
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe A Modeling Approach for Designing New Acoustic Materials(Gazi Univ, 2024) Buluklu, Hatice Mehtap; Kose, Ercan; Bal Kocyigit, FilizIn this study, mathematical modeling design based on Sound Transmission Loss measurement results of new acoustic material samples with natural content was carried out. Using the test samples in question, transfer function of acoustic materials based on electronic filter circuit design and a transition design method for the production of new acoustic materials by utilizing the transfer function is presented. Based on the experimental results of the test samples, it is the most suitable low-pass filter structure for the proposed design. In this study, active Sallen-Key lowpass filter structure is preferred and used. Sound Transmission Losses in dB (decibels) of acoustic samples were obtained experimentally for 500, 1000, 2000 and 4000 Hz. fundamental frequencies in the literature. Based on these data, transfer function simulation suppression gain results were obtained in TINA-TI program, active filter circuit designed, and MATLAB program. When the other results were compared in the experimental results, it was seen that very close values were obtained. It has been demonstrated that the proposed method can be used effectively in the design and examination of new acoustic materials.Öğe A novel application for DC motor-generator cascade system by changing signal density of digital chaotic oscillator(Yildiz Technical Univ, 2023) Kose, Ercan; Muhurcu, Aydin; Coskun, SerdarPresented is a new method for the realization of a chaotic oscillator in a digital environment. First, a two-stroke sampling mathematical regulation is developed for discrete-time oscillator equations to change signal densities of chaotic signals. This proposed mathematical regulation is applied to Lorenz's chaotic oscillator, which presents a complex dynamical behavior. An application is shown with simulation through a Matlab-Simulink environment with time-de-pendent density changes of x, y and z 1 - D graphics and x, y 2 - D phase space graphics that are dependent on different density changes. Further to this, in an experimental study, Lorenz's chaotic oscillator's signals with variable density is applied to a DC motor as armature voltage via an 8-bit microcontroller based hardware environment. Chaotic supply voltage is applied to the motor rotor to generate a chaotic angular velocity. Time-dependent density change results of x, y and z 1 - D graphics are obtained and shown on an oscilloscope by converting chaotic rotor angular velocity to electrical signals, through a tacho-generator. The observed results re-vealed that chaotic signal production with variable density is achieved both in the simulation environment and the experimental environment. Also, it is shown that the proposed program and mathematical equations are feasible in terms of hardware and software implementations.Öğe A Novel Balanced Arithmetic Optimization Algorithm-Optimized Controller for Enhanced Voltage Regulation(Mdpi, 2023) Ekinci, Serdar; Cetin, Haluk; Izci, Davut; Kose, ErcanThis work introduces an innovative approach that unites a (PIDNDN2)-N-2 controller and the balanced arithmetic optimization algorithm (b-AOA) to enhance the stability of an automatic voltage regulator (AVR) system. The (PIDNDN2)-N-2 controller, tailored for precision, stability, and responsiveness, mitigates the limitations of conventional methods. The b-AOA optimizer is obtained through the integration of pattern search and elite opposition-based learning strategies into the arithmetic optimization algorithm. This integration optimizes the controller parameters and the AVR system's response, harmonizing exploration and exploitation. Extensive assessments, including evaluations on 23 classical benchmark functions, demonstrate the efficacy of the b-AOA. It consistently achieves accurate solutions, exhibits robustness in addressing a wide range of optimization problems, and stands out as a promising choice for various applications. In terms of the AVR system, comparative analyses highlight the superiority of the proposed approach in transient response characteristics, with the shortest rise and settling times and zero overshoot. Additionally, the b-AOA approach excels in frequency response, ensuring robust stability and a broader bandwidth. Furthermore, the proposed approach is compared with various state-of-the-art control methods for the AVR system, showcasing an impressive performance. These results underscore the significance of this work, setting a new benchmark for AVR control by advancing stability, responsiveness, and reliability in power systems.Öğe Analysis of precautions taken for protection from X-rays in a hospital in Gaziantep in the context of workplace health and safety(Elsevier, 2022) Yildiz, Abdulazim; Kose, Ercan; Demirtas, Omer CanObjective: Healthcare personnel who work in units of hospitals where ionizing radiation is used are in an at risk group, and their health statuses should be periodically monitored. Although some health problems do not emerge right after exposure to low-dose radiation, various diseases can arise in the long term. The purpose of this study is to promote responsibility among radiology professionals and prevent diseases that may emerge in the future by drawing attention to context of workplace health and safety. In this study, measurements were made at locations where radiology personnel worked. Method: Radiation measurements were obtained based on five repeated measurements at different points of the drafting chambers. It has been observed that the measurement values are close to each other. However, comparisons were made by taking the average values. In this study, X-ray measurements were made with three patients in four different hospital units. The Fluke 451 Ion Chamber Radiation Survey Meter device was used in the measurements, and the measurements were made based on the positions of the personnel in the radiation field in all units of the hospital where X-rays were used. The minimum measurement value was found behind the lead screen as 0.01 mu Sv, while the highest value was found in the room where the images were taken by wearing lead aprons and thyroid shields as 410 mu Sv. Results: The findings of this paper include the minimum and maximum values of X rays during imaging at different hospital units which are mammography, computed tomography, fixed X-ray machine and bone densitometry machine. Conclusion: To prevent these personnel from exceeding the standard exposure limits in terms of workplace health and safety, ensuring that they constantly use protective equipment and limiting the number of imaging procedures they carry out will be beneficial in terms of health in the long term.Öğe Comparative Controlling of the Lorenz Chaotic System Using the SMC and APP Methods(Hindawi Ltd, 2018) Kose, Ercan; Muhurcu, AydinThe Lorenz chaotic system is based on a nonlinear behavior and this causes the system to be unstable. Therefore, two different controller models were developed and named as the adaptive pole placement and sliding mode control (SMC) methods for the establishment of continuous time nonlinear Lorenz chaotic system. In order to achieve this, an improved controller structure was developed first theoretically for both the controller methods and then tested practically using the numerical samples. During the establishment of adaptive pole placement method for the Lorenz chaotic system, various stages were applied. The nonlinear chaotic system was also linearized by means of Taylor Series expansion processes. In addition, the feedback matrix of the adaptive pole placement method was determined using linear Jacobian matrix. The chaotic system reached an equilibrium point by using both the SMC and adaptive pole placement methods; however the simulation results of the SMC had better success than adaptive pole placement control technique.Öğe Feedforward-Compensated PI Controller Design for Air-Fuel Ratio System Control Using Enhanced Weighted Mean of Vectors Algorithm(Springer Heidelberg, 2023) Izci, Davut; Kose, Ercan; Ekinci, SerdarThe air-fuel ratio (AFR) system helps reducing the rate of harmful pollutants in lean combustion spark-ignition engines and achieving optimal fuel consumption, thus, has a significant role in terms of protecting the environment and the consumer's budget. The AFR system includes time delays and presents uncertainties due to existing subsystems and requires an effective control method. Therefore, in this study, a feedforward (FF) compensated proportional-integral (PI) control method based on the enhanced weighted mean of vectors algorithm (En-INFO) is proposed for more effective control of the AFR system. The developed En-INFO algorithm was used to optimally determine the coefficients of the PI + FF controller. The initial performance of the En-INFO algorithm was tested against benchmark functions comparatively and its superiority was confirmed. To achieve optimal tuning of PI + FF controller, a modified integral of squared error objective function was also proposed. The AFR system control was performed using the optimal controller coefficients calculated by the En-INFO algorithm. The performance of the developed control structure was comparatively demonstrated using several analyses such as transient response, tracking performance, disturbance rejection and Pade approach techniques. The results revealed that the PI + FF control method based on the proposed En-INFO algorithm can be used as an effective method for the AFR system control.Öğe Low-Cost Alpha Cabin Like Test Box Proposal for the Development of New Acoustic Sound Insulation Materials(Gazi Univ, 2023) Buluklu, Hatice Mehtap; Kocyigit, Filiz Bal; Kose, ErcanExperimental criteria for sound insulation material recommendation and design have an important share in indoor acoustic control. Among these criteria, laboratories with devices such as impedance tubes, alpha cabins and reverberation rooms used to measure and analyze parameters such as sound transmission loss and sound absorption coefficient have been investigated. In literature, it has been observed that there are studies on acoustic materials and the tests applied to these materials, but the application is more limited. According to research data, an Alpha Cabin model system design that can be used to develop new types of acoustic sound materials has been proposed. In addition to the fact that a large number of experimental measurements can be performed at lower costs using the designed Alpha Cabin model system, many tests can be performed easily for different material designs in a very short time. To perform these tests, the Alpha Cabin system has been designed based on noise and sound insulation. For example, floating flooring, ribbed connection, and so on. Afterward, different insulation materials were used for insulation purposes and standards were achieved. The Alpha Cabin test system, which was designed and developed, overlaps the experimental and theoretical data for 500, 2000, and 4000 Hz when compared with the values of 29.1 dB for 500 Hz, 38.6 dB for 2000 Hz, and 49 dB for 4000 Hz measured in the Acoustic Facade Panel Test Room, and it has been observed that it can be used in the development of new sound insulation materials.Öğe Optimal Control of AVR System With Tree Seed Algorithm-Based PID Controller(Ieee-Inst Electrical Electronics Engineers Inc, 2020) Kose, ErcanIn this study, an optimal Tree-Seed Algorithm (TSA) algorithm-based Proportional-Integral-Derivative (PID) controller is proposed for automatic voltage regulator (AVR) system terminal tracking problem. PID controller gains $K\text{p}$ , $K\text{i}$ , and $K\text{d}$ are optimized with the proposed TSA algorithm based on different objective functions. The TSA-based optimal PID controller & x2019;s performance is compared with numerous PID controllers, which were developed using different meta-hermetic optimization algorithms in the literature. Several analysis methods including root locus, bode analysis, robustness, and disturbance rejection are studied and compared with reported works in the literature. It is shown that there is still a research gap to improve the tracking performance of the AVR system due to its importance in electrical systems. According to the obtained comparison results, it has been revealed that the proposed TSA-based PID controller improves tracking properties under load change thus it can be effectively used for synchronous generator automatic voltage regulator terminal voltage stability.Öğe Organic Waste as a Soundproofing Material: An Experimental Study(Springer Heidelberg, 2024) Buluklu, Hatice Mehtap; Kocyigit, Filiz Bal; Kose, ErcanUsing sound insulation materials that do not impair indoor air quality and do not emit carbon.Increasing the sound insulation capacity with combinations of different natural materials.To enable to increase the intensity of use thanks to its economical production. Objective The aim of the study is to develop new acoustic materials and panels that high sound transmission loss (STL), low carbon emissions, high sensitivity to human health, and also do not harm the indoor air quality. These materials are currently grown in Turkey and can be easily adopted in the industry. It has been comparatively analyzed that the developed materials can be alternatives to the synthetic materials on the market.Methods In the experiment box similar to Alpha Cabin, which was designed and developed before, the STL values were obtained by conducting experiments in the frequency range 500-8000 Hz. with many natural and synthetic materials. In the study, low carbon emission natural materials with a STL of more than 30 dB were selected.Simulation The experimentally measured samples were simulated in the acoustic module of the ANSYS program and compared with the results.Conclusion The main purpose of choosing cones and walnut shells grown in our country is to contribute to the amount of oxygen in the atmosphere and green areas by increasing the cultivation of pine and walnut trees. In the tests of the samples, it was determined that the highest STL was 63.27 dB in the concave and egg-shaped sample, and 62.41 dB in the concave walnut shell and egg form. It is envisaged that the materials we obtained can be used in the sound insulation of machines and devices that produce 85 dB and above sound harmful to human health according to ILO and WHO standards.Öğe Performance Evaluation of YOLOv4 for Instant Object Detection in UAVs(Ieee, 2024) Keskinoglu, Gul Bahar; Yesilkaya, Nimet Seleri; Bayraktar, Irem; Kose, ErcanUnmanned Aerial Vehicles (UAVs) have become integral in various research domains due to the advantages they provide. Current UAV systems rely on Global Navigation Satellite Systems (GNSS) for flight control and sensors for obstacle detection, yet fully autonomous decision-making remains a challenge. This study evaluates the performance of YOLOv4, a Convolutional Neural Network (CNN) image recognition algorithm, for instantaneous object detection and classification in UAV-captured aerial images. The study demonstrates the applicability of YOLOv4 in real-time object detection and classification through UAV image feeds. The proposed approach advances the understanding of deploying CNNs in UAVs, offering a cost-effective solution for real-time object detection and classification, essential for autonomous UAV operations.Öğe The Control of Brushless DC Motor for Electric Vehicle by Using Chaotic Synchronization Method(Natl Inst R&D Informatics-Ici, 2018) Kose, Ercan; Muhurcu, AydinBrushless DC motor (BLDC) used in electric vehicles can be operated in normal weather conditions and on straight roads, with chaotic dynamics of BLDC motor and high efficiency at a certain stable point. The dynamics of the BLDC motor applied on the electric car can be constantly changed according to the road conditions and wind speed. In this study, chaotic synchronization methods were developed to convert the BLDC motor into the desired reference chaotic dynamics. Synchronization method is developed based on sliding mode control (SMC), PI control and adaptive control methods. The artificial bee colony algorithm has been used to calculate the optimal values of the Kp and Ki coefficients of the PI controller. The numerical simulation results showing the performances of the controllers were obtained in MATLAB-Simulink environment. In order to better compare the performance of the controllers, the error performance indices have been provided according to these three control methods. All the three methods have shown that the chaotic based BLDC motor can be controlled, but sliding mode control method has proved to be a better performer.
