Yazar "EŞen, İsmail" seçeneğine göre listele

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    Comparative analysis of full car model with driver using pid and lqr controllers
    (2022) Eroğlu, Mustafa; Koç, Mehmet Akif; Kozan, Recep; EŞen, İsmail
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    Design of a metro train and structural analysis of the metro vehicle body by finite element method
    (2022) Arı, Muhammed Emin; EŞen, İsmail
    Since metros are high capacity, fast and large in size compared to other urban rail vehicles, the importance of body strength is very critical. In this study, a four-car metro system was designed and structural analyses of the vehicle body were carried out using the finite element method according to EN 12663-1 standard. Structural analyses were performed under three different conditions. the total mass of the 22.7 m long vehicle with all its equipment was 35000 kg, and the total passenger mass was calculated as 27020 kg based on the presence of 8 passengers per square meter, and the total total mass was taken as 62020 kg. Various sizes of SUS304 stainless steel profiles and sheet materials have been selected for the body carrier skeleton system of the vehicle. In the analysis; vertical loads were made on the passenger side of the vehicle body and horizontal compression loads were made on the bumper areas and maximum stress and displacement amounts were determined. It was found that in the passenger compartment of the car body, the maximum amount of stress in vertical loads is below the yield stress, but in the case of compression loading in the bumper area, the maximum stress is above the yield stress. In order to provide the necessary stress conditions for the design of the buffer zone and its surroundings, solution proposals have been made to revise the design.
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    Design of the active control algorithm to reduction of the vibrations due to interactionhigh-speed railway vehicle bogie and structure
    (2021) Koç, Mehmet Akif; Eroğlu, Mustafa; EŞen, İsmail
    This study analyzes excessive vibrations that occurred on the railway vehicle bogie with the computer simulation of a 4-DOF half car railway bogie dynamic physical model and Euler-Bernoulli flexible bridge beam with the simply supported boundary conditions has been introduced considering some limitations which affect problem formulation. To reduce these excessive vibrations other than conventional suspension systems such as passive one, an active suspension system has been designed and attached to the primary suspension system of the railway bogie car. Then, to control these active suspension systems, a control algorithm based on PID and SMC is considered. The coupled equation of motion of the railway bogie car and flexible Euler-Bernoulli bridge beam is obtained by Hamilton’s principle in the time domain with the active suspension system. Finally, to demonstrate the effect of the active suspension system with the PID and SMC algorithm upon these excessive vibrations, a computer simulation has been implemented, and the results are presented comparatively. Consequently, the maximum railway vehicle bogie vertical displacement and vertical acceleration have been significantly reduced.
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    Dynamic analysis of flexible structures under the influence of moving multiple vehicles
    (2018) Koç, Mehmet Akif; Eroğlu, Mustafa; Çay, Yusuf; Çerlek, Ömer; EŞen, İsmail
    In this study, the parameters affecting the dynamic behavior of flexible structures under the influence ofmultiple vehicle passages are examined in detail. The flexible structure considered in the study is considered as abridge girder with simple supported boundary conditions which modelled according to Euler-Bernoulli thin beamtheory. The equations of motion of the bridge beam in contact with the vehicle passing over the bridge wereobtained by using the Lagrange equation after the kinetic and potential energies of the system were obtained. Thesecond-order differential equations representing the motion of the system are transformed from the first-order statespace matrix representation to the first-order state using the state variables specified in the study. The system ofdifferential equations is then solved with high accuracy using a special program prepared in the MATLABcommercial software using the Runge-Kutta algorithm from the fourth degree in the time domain.
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    Self-tuning fuzzy logic control of quarter car and bridge interaction model
    (2021) Eroğlu, Mustafa; Koç, Mehmet Akif; Kozan, Recep; EŞen, İsmail
    In this study, active suspension control of the interaction between the bridge can be modeled according to the Euler-Bernoulli beam theory, and the quarter car model with three degrees of freedom is studied. The active suspension system consists of a spring, damper, and linear actuator. The active suspension control is designed using classical PID and self-tuning fuzzy PID (STFPID) to reduce the vehicle body's disruptive effects. To determine the performance of the designed controllers, two different road profiles with the bridge oscillations caused by the bridge flexibility were considered as the disruptive effect of the vehicle. When the simulation results were examined in terms of passenger seat displacement and acceleration, the proposed STFPID method significantly increased road holding and ride comfort.