Browsing by Author "Şeker S."
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Item An application of denoising based on wavelet transform for temperature signals of the alternators in a passenger coach(2008) Taşkin S.; Akinci T.Ç.; Şeker S.This paper deals with a passenger coach alternators. In this study, temperature variations, which are depended on load conditions of alternators in a passenger coach, have been investigated using the wavelet transform based denoising and statistical methods. To obtain real road data from the bus alternators, the bus was driven 456 km on the roadway in Turkey. During the collecting alternators data, interior lighting lambs on/off locations, air conditioner operation position, bus headlights situations and other electrical/electronic devices on/off positions have been considered. MATLAB program was used for the signal analysis of the alternators.Item Analysis of vibration signals related to fuel tank in a passenger coach; [Bi̇r yolcu otobüsünün yakit deposununa i̇li̇şki̇n ti̇treşi̇m si̇nyalleri̇ ni̇n anali̇zi̇](2008) Şeker S.; Taşkin S.; Akinci T.Ç.In this study, the data which was taken from accelerometer located in vertical direction to fuel tank chassis of a traveler bus has been analyzed. Firstly vibration signal related to the endurance of the connection has been observed as a raw data on the time-frequency plane and then it has been passed from a critical frequency 20 Hz low pass filter and power spectrum changes have been observed. After this, critical frequency value whose peak value is about 11 Hz has been forced mechanically to the construction which consists of fuel tank has been determined. In addition, it was determined that 11 Hz emerged at about 244th second on the time scale and it has been observed that big amplitude has also been created by this frequency on the time serial. ©2008 IEEE.Item Detection of static eccentricity for permanent magnet synchronous motors using the coherence analysis(2010) Akar M.; Taşkin S.; Şeker S.; Cankaya I.This paper reports on work to detect the static eccentricity faults for permanent magnet synchronous motor (PMSM) using spectral analysis methods. Measurements are carried out by the collecting the stator current and voltage, torque and speed for healthy and faulty cases of the motor. Static eccentricity case is formed by changing the rotor position in the mannner of sliding the shaft on a horizontal axis. As a result of the spectral analysis for the motor currents, side band effects appeared at around the fundamental frequency are determined as a most important indicator of the eccentricity. In addition to this determination, the eccentricity problem is observed from the torque and rotor speed data comparing with each others as well as current and voltage variations. © TÜBİTAK.Item Determination of reducing coefficient values of semi-rigid frames using artificial neural network(Association for Scientific Research, 2011) Şeker S.; Öztürk A.U.; Kozanoǧlu C.Lateral rigidity is a great issue in the view of structural analysis in civil engineering applications such as production of buildings, bridges, dams and roads. Furthermore, the connection properties have a remarkable role on the lateral rigidity and the tendency of structures under service loads. In fact, there aren't any structures with perfectly rigid connections between beams and columns. Therefore, all connections performed by construction process can be defined as semi-rigid as, especially connections in steel structures. The effect of connection type on the lateral rigidity values of structures can be determined by reducing coefficients decreasing lateral rigidity with a certain extent. In the scope of this study, connection flexibility is modeled by linear elastic rotational springs for semi-rigid frames. The reducing coefficients are determined by using a computer program. Results are compared to the values predicted by artificial neural network (ANN) analyses. A strong relationship was established between calculated and predicted values. © Association for Scientific Research.Item Investigating the effect of joint behavior on the optimum design of steel frames via hunting search algorithm(Hong Kong Institute of Steel Construction, 2018) Doğan E.; Şeker S.; Polat Saka M.; Kozanoğlu C.This study aims to carry out the effect of beam-to-column connections on the minimum weight design of steel plane frames. In the practical analysis of steel frames, end connections are assumed to be either fully restrained or pin-connected. However, experiments reveal that the real behavior is between these extremes and should be taken into account for the realistic design of structures. Hunting search algorithm is used for the automation of optimum design process. It is a numerical optimization method inspired by group hunting of animals such as wolves and lions. It is proven that it is a reliable and efficient technique for obtaining the solution of discrete structural optimization problems. Present design algorithm developed on the basis of hunting search algorithm selects w-sections for the members of semi rigid steel frame from the complete list of w-sections given in LRFD-AISC (Load and Resistance Factor Design, American Institute of Steel Construction). The design constraints are implemented from the specifications of the same code which covers serviceability and strength limitations. The selection of w-sections is carried out such that the design limitations are satisfied and the weight of semi-rigid frame is the minimum. In order to demonstrate its efficiency, three different steel frames are designed by the optimum design algorithm presented. The designs obtained by use of this algorithm are also compared with the ones produced by particle swarm optimization method. © 2018, Hong Kong Institute of Steel Construction. All rights reserved.