In the science and engineering, supporting theoretical knowledge with practical information is crucial. Thus, there are laboratory courses together with theoretical lectures in engineering education. However, laboratory applications can't give expected successful results because of insufficient laboratory environment of educational institutions, excessive number of students etc. Depending on the developments in the computer field, concepts such as computer aided education, computer‐assisted learning, computer‐aided engineering have gained importance. In the carried out study, remote accessible virtual laboratory consisting of six modules is designed for power electronics courses. Realized software which can run online or offline and includes almost forty circuits (rectifiers, dc–dc converters, ac–ac converters, dc–ac converters, power supplies) belongs to power electronics field. Detailed analysis and applications can be realized with the virtual laboratory which also contains description of subjects, animations, online support, environment for preparing lab reports etc. The software is available in Uludag University, 111 undergraduate students and 17 faculty members tested it separately without requesting their personal information. Obtained results from two questionnaires are evaluated here. © 2015 Wiley Periodicals, Inc. Comput. Appl. Eng. Educ. 24:71–78, 2016; View this article online at http://wileyonlinelibrary.com/journal/cae; DOI
Computers are widely used for educational purposes. Multimedia tools and simulations are mostly preferred for learning especially hard and complex structures in technical field and hardly realized experiments in laboratory environment. Besides, supporting theoretical knowledge with practical applications is crucial in engineering education. But, effects of negative conditions such as hardware deficiency (experimental gadgets, measuring instruments, etc.) in education environment, high number of students, less number of educators can be diminished with concepts which are distance education, computer‐aided education, etc. In this study, web‐based educational tool which is oriented to signals and systems subjects/courses is realized. This tool provides learning of signals and systems subjects with its subject descriptions, solved/unsolved problems, animations, simulations, interactive simulators, real‐time applications, general exams, online communication/support, and new educational strategy in easy, simple, and effective way. Usability and educational contribution of realized study was inspected with questionnaires which were filled anonymously by 110 students in Uludag University and assessed according to SUS and Likert scales.
Inter-harmonics which exist in non-integer multiples of main harmonics cause power quality problems. In this study, in order to overcome power quality problems, ESPRIT algorithm which is one of the methods used for inter-harmonic detection which couldn't be accomplished by conventional spectrum analysis methods such as Fast Fourier Transform was realized in MATLAB environment. Software which was prepared in MATLAB environment has properties which are creating input signals, importing external signals, plotting frequency spectrum which is computed from obtained values with ESPRIT and presenting relative error rate of real signal values and ESPRIT algorithm values.
Elektrik enerji sistemlerinde doğrultucu devreleri önemli yer tutmaktadır. Özellikle çok farklı seviyelerde çıkış gerilimleri oluşturabilme yeteneklerine sahip tristörlü doğrultucu devrelerinde en uygun tetikleme açılarının belirlenmesi/hesaplanması ve bu açılarda tetikleme işaretlerinin uygulanması temel işlemlerdir. Gerçekleştirilen çalışmada; istenilen seviyedeki çıkış gerilimin ortalama veya etkin değerine göre tetikleme açıları hem klasik denklem çözümüyle hem de genetik algoritma ve diferansiyel gelişim algoritması kullanılarak elde edilmiştir. Bu doğrultuda; doğrultucu devrelerinin eğitiminde de kullanılabilecek ve en uygun tetikleme açılarını hem klasik hem de evrimsel algoritmalarla hesaplayabilen, sonuçları ve devreye ait birçok özellik/parametreleri hem sayısal hem de grafiksel olarak sunabilen bir yazılım geliştirilmiştir. Yazılımla gerçekleştirilen analizler/benzetimler, bu alanda da evrimsel algoritmaların hızlı, etkin ve verimli bir şekilde kullanılabileceğini göstermiştir.
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