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Öğe Combined kinetic charging of particles on the precipitating electrode in a corona field(Iop Publishing Ltd, 2004) Alisoy, HZ; Alisoy, GT; Hamamci, SE; Koseoglu, MIn this paper, we give the results of the theoretical study concerning the combined kinetic charging of the particles on the precipitating electrode in a corona field by taking into account contact charging. We derive some mathematical equations that allow us to determine the limit charge values on the particles and the charging kinetics of the particles. It has been demonstrated that the limit charge value on the particle can be less than the value calculated using the Pauthenier theory. In the case when the time constant ratio of contact and field charging mechanisms is equal to the ratio of the maximum charges of these charging mechanisms, we find that the sign of the limit charge on the particle has changed.Öğe Robust controller design for TITO processes with coefficient diagram method(Ieee, 2003) Hamamci, SE; Koksal, MIn this paper, Coefficient Diagram Method (CDM) is used to design controller for two-input two-output (TITO) processes. The interaction between the loops are minimized by using the conventional decoupler design method; then, decentralized CDM controllers are designed for the process and decoupler blocks. Several examples are presented to illustrate the effectiveness of the proposed method and compared it with existing ones. It is shown that CDM design is more stable and robust whilst giving the desired time domain performance.Öğe A robust model-based control for uncertain systems(Sage Publications Ltd, 2002) Hamamci, SE; Ucar, AA new robust control strategy coefficient diagram method (CDM), which is an algebraic approach applied to a polynomial loop in the parameter space, is studied in this paper. Here, a model-based CDM is developed and proposed for uncertain systems. A special diagram called a coefficient diagram, which is used as a vehicle to carry the necessary information and as the criteria of good performance, is designed and modified accordingly. The performance of this novel controller is illustrated through several examples, and numerical results are provided.Öğe A robust polynomial-based control for stable processes with time delay(Springer, 2005) Hamamci, SEIn this paper, the coefficient diagram method (CDM) is used to design a controller for stable processes with a time delay to achieve high performance. For this, first order plus time delay (FOPTD) and second order plus time delay (SOPTD) models are used. The explicit tuning formulae of the controller using the polynomial representation are presented based on closed-loop pole-allocation strategy according to the FOPTD and SOPTD plant models. The results are compared with other commonly available tuning methods. It is shown that the CDM control system is more successful in view of the stability, time response, disturbance rejection and robustness properties of the closed loop system.
