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    LPV gain-scheduling controller design for a non-linear quarter-vehicle active suspension system
    (Sage Publications Ltd, 2009) Onat, C.; Kucukdemiral, I. B.; Sivrioglu, S.; Yuksek, I.; Cansever, G.
    There always exists a conflict between ride comfort and suspension deflection performances during the vibration control of suspension systems. Active suspension control systems, which are designed by linear methods, can only serve as a trade-off between these conflicting performance criteria. Both performance objectives can only be accomplished at the same time by using a non-linear controller. This paper addresses the non-linear induced L-2 control of an active suspension system, which contains non-linear spring and damper elements. The design method is based on the linear parameter varying (LPV) model of the system. The proposed method utilizes the bilinear damping characteristic, stiffening spring characteristic when the suspension deflection approaches the structural limits, mass variations and parameter-dependent weighting filters. Simulation studies both in time and frequency domain demonstrate that the active suspension system controlled by the proposed method always guarantees an agreement between acceleration (comfort) and suspension deflection magnitudes together with a high ride performance.
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    PID Tuning Method for Integrating Processes Having Time Delay and Inverse Response
    (Elsevier, 2018) Ozyetkin, M. M.; Onat, C.; Tan, N.
    In this paper, a PID tuning method for integrating processes having time delay and inverse response is presented. The method is based on the stability boundary locus method and geometrical center (WGC) approach. The systematic procedure of the method is first to obtain the stability region in the PI controller parameters (proportional gain: k(p) and integral gain: k(i)) plane according to derivative gain (k(d)) using the stability boundary locus method and then to find the weighted geometrical center point of this region. The WGC controllers are obtained by using different values of k(d). Simulation examples have demonstrated that PID controller designed by using the proposed method gives good results. (C) 2018, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.