Master Degree / Yüksek Lisans Tezleri

Permanent URI for this collectionhttps://hdl.handle.net/11147/3008

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Department: search.filters.department.Thesis (Master)--İzmir Institute of Technology, Electrical and Electronics EngineeringSubject: search.filters.subject.Control systems

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  • Master Thesis
    On Improving the Performance of Repetitive Leaning Controllers
    (Izmir Institute of Technology, 2019) Çobanoğlu, Necati; Tatlıcıoğlu, Enver
    Robot manipulators are widely used to perform pre–defined tasks repetitively. Nearly all of the mass production factories use the robot manipulators to perform specific operations over and over again. In such a system, the control design may contain some difficulties, unavailabilities and/or there would be additive disturbances due to the periodic motion. Moreover, cost reduction may be vital, hence sensor usage has to be reduced. In the first part of this thesis, to address those restrictions, a model free full state feedback repetitive learning controller which is fused with a one–layer neural network is proposed for robot manipulator which performs a periodic motion. Stability of the system is ensured via Lyapunov based techniques. Numerical simulations and experimental results are introduced to demonstrate the performance of the proposed controller. In the second part of the thesis, under the additional constraint that velocity measurements being unavailable, output feedback repetitive learning controller fused with a neural network term is investigated. The dynamic model of the robot manipulator is again considered as uncertain to avoid its usage as part of the control design, and the reference position vector is still considered to be periodic. The stability of the closed loop system is investigated via Lyapunov based techniques. Numerical simulations are added to demonstrate the proposed controller performance.
  • Master Thesis
    Design, Development and Control of a Twin Rotor Systems
    (Izmir Institute of Technology, 2014) Doğan, Fırat; Tatlicioğlu, Enver
    Twin rotor multi-input multi-output system (TRMS) is a laboratory setup resembling the dynamics of a helicopter. It is a complicated nonlinear system with high coupling effects between the propellers. In the literature, there is no commonly agreed dynamic model for these systems mainly due to the difficulties in modelling aerodynamic effects. As a result, numerical simulations of controllers performed on currently available dynamic models do not agree with experimental results obtained from a real system. The main motivations behind this thesis are to develop a TRMS in our laboratory and then apply different control algorithms on it. Firstly, the mechanical system is described briefly. The mechanical components are explained and the computer aided design model is given. The electronic system is then presented in detail. In the electronic system, hardware parts of the TRMS (mainboard, encoder reader circuits, and motor controller circuits) and the embedded algorithms are developed. The development of the user interface that is used both to observe the TRMS and to communicate with it, is then explained. Development of a mathematical model of the TRMS is described where its physical parameters are given. Finally, the performance of the TRMS is verified by conducting experiments for proportional, integral and derivative type controllers. The analysis of the experiments are discussed and compared in average maximum steady-state error, average root-mean-square error, error standard deviation, average root-mean-square control input and control input standard deviation.