Meslek Yüksekokulları / Vocational Schools

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Browsing Meslek Yüksekokulları / Vocational Schools by Author "Akıncı, Tahir Çetin"

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    A Neuro-Detector Based On The Cybernetic Concepts For Fault Detection In Electric Motors
    (Journal Vibroengineering, Geliu Ratas 15 A, Kaunas, Lt-50282, Lithuania, 2011-12) Şeker, Serhat; Önal, Emel; Kaynaş, Tayfun; Akıncı, Tahir Çetin; TR7480; TR149517; TR141423; TR40367
    In this study, an auto-associative neural network (AANN) is designed as a fault detector using the cybernetic concepts. In this sense, an artificial neural network structure is connected with a finite state system or a finite automata and an AANN topology is described as a virtual detector. In terms of the practical application, vibration signals, which are taken from an induction motor of 5 HP for both the healthy and faulty motor cases, are considered in the spectral domain. The vibration signal presented in the healthy motor case is separated into 4 blocks and the spectral set of these blocks is used as input and target pattern sets during the training of the AANN. After the training process, a new vibration spectrum, which is defined in the faulty motor case is applied to this trained network and the faulty case is determined by the error variation at output nodes of the AANN. In this application, the error signal shows huge amplitudes between 2 and 4 kHz as an indicator of the bearing damage.
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    Defect Detection for Ceramic Materials by Continuous Wavelet Analysis
    (Kaunas Univ Technology Press, K Donelaicio 73, Kaunas Lt 3006, Lithuania, 2011) Kaynaş, Tayfun; Akıncı, Tahir Çetin; Yılmaz, Özyazgan; Özgiray, M.; Şeker, S.; 141423; 40367
    In this study, it is achieved to detect internal or surface cracks that can occur in the production of ceramic plates by using the method of impulse noise. Ceramic materials are often used in the industry especially as kitchenware of in areas such as construction sector. Many different methods are used in the quality assurance processes of ceramic materials. In this study, impact noise method is examined. This method is a test technique which is not used in the applications. The method is presented as an examination technique based on whether there is a deformation on the material according to the sound coming from the ceramic material as a result of a plastic bit hammer impact on the ceramic material. The application of the study is performed on plates made of ceramic materials. Ceramic double plates, made up of same materials, with same features, but in different models, are used therein. One of these ceramic double plates, both of which are completely in kind, is intact, and the other is cracked. Impulse noises, having arisen from the equal impulse power applied on these intact and cracked plates of same model were examined via wavelet analysis. By means of the applied method, it is seen to have shown significant results in distinguishing intact and cracked plates. Having the frequency and magnitude dimensions of the damages on the plates also examined by means of the applied analysis, significant distinguishing findings are attained therefrom.