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    Comparison of Robust Input Shapers for Elimination of Residual Vibrations
    (Trans Tech Publications Ltd, 2014) Conker, Caglar; Yavuz, Hakan; Kapucu, Sadettin; Baltacioglu, Mustafa Kaan; Arat, Huseyin Turan; Burgac, Alper
    Input shaping is a feedforward control technique for improving the settling time and positioning accuracy, while minimizing residual vibrations. Shaped command profiles are generated by convolving a sequence of impulses. To design an input shaping controller, estimates of the system natural frequency and damping ratio are required. However, real systems cannot be modeled exactly, making the robustness to modeling errors an important consideration. Many robust input shapers have been developed, but robust shapers typically have longer durations that slow the system response. This creates a compromise between shaper robustness and rise time. This paper analyses the compromise between shaper duration and robustness for several robust input shapers
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    Control application and performance analysis of wave energy converters
    (Elsevier Sci Ltd, 2013) Yavuz, Hakan; Serin, Hasan; Conker, Caglar; Aydin, Kadir; Uluocak, Ihsan
    [Abstract Not Available]
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    An Enhanced Control Technique for the Elimination of Residual Vibrations in Flexible-Joint Manipulators
    (Assoc Mechanical Engineers Technicians Slovenia, 2014) Conker, Caglar; Kilic, Ali; Mistikoglu, Selcuk; Kapucu, Sadettin; Yavuz, Hakan
    One method used to reduce or eliminate residual vibrations is to modify the input signal by using previously determined system parameters. In order to eliminate the residual vibration completely, these system parameters must be very accurately determined. In real systems, achieving such accuracy may not always be possible. To address this problem and to provide a solution, a new residual vibration elimination method is introduced in this study, which has proven to be useful especially in cases of uncertain parameters of estimated or predicted systems. It is shown that the technique is capable of handling high levels of uncertainty and is able to successfully eliminate or reduce residual vibrations in flexible systems. In this approach, the desired position of the system is primarily divided into two equal parts, and the generated input signal is used to eliminate vibration. This study presents theoretical and experimental results of the techniques applied to a flexible mechanical system; a comparative study of robustness performance is also provided. Simulation and experimental results show that the oscillations are considerably decreased with a high degree of robustness in the presence of uncertainty regarding system parameters.
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    Experimental Investigation of Performance and Emission Parameters Changes on Diesel Engines using Anisole Additive
    (Trans Tech Publications Ltd, 2014) Baltacioglu, Mustafa Kaan; Aydin, Kadir; Yasar, Ergul; Arat, Huseyin Turan; Conker, Caglar; Burgac, Alper
    In this study, effect of anisole additive into the diesel fuel on performance and emission parameters of diesel engines was investigated. Instead of structural changes which are more difficult and expensive, development of fuel technologies is preferred to provide reduction on exhaust gas emissions which are harmful to environment and human health. Therefore, in this experimental study, anisole was used as additive into diesel fuel with the volumetric ratio of 1,5%, 3% and 5%. The performance characteristics and exhaust emissions of a four cylinder, four stroke, naturally aspirated, water cooled, direct injection compression ignition engine fueled with modified fuels were analyzed. Engine was subjected constant speed, full load conditions during tests. Engine power, torque, specific fuel consumption, carbon monoxide, nitrogen oxide and carbon dioxide emissions were measured and results were evaluated. Changes in performance parameters were negligible for all ratios of modified fuels except specific fuel consumption. Finally, while carbon monoxide gas emissions were increased with anisole additive, carbon dioxide and nitrogen oxide gas emissions were decreased.