This paper studies the control of the ball-and beam system by different controllers. Many nonlinear controllers for ball and beamsystem can achieve in some cases asymptotic stability.On the other hand, many laboratories useProportional Integral Derivative control for the ball and beam system, but theory analysisis based on a linear approximate model. Therefore, some methods of controlfor the ball's position in this system are required for getting ideal system. The fuzzy logic controller will achieved ideal response of the stability of Ball and Beam system.Later in this paper, we will implement a PID control and fuzzy logic control to get the ideal stability. The paper had shown great progress and successful results.
Power Plant Heat exchanger is widely used in chemical and petroleum plants because it can sustain wide range of temperature and pressure. Heat exchanger is a high nonlinearity and poor dynamics plant; therefore it is complex to model and difficult to control its dynamics. In this paper two types of heat exchanger model and controller are applied for selecting suitable model and controller. First model is called (Physical model) and derived using real parameter of heat exchanger plant. Second, a Second Order Plus Dead Time (SOPDT model) that is derived from the response of heat exchanger. While the controllers are consisted of fuzzy proportional derivative (FPD) controller and proportional integral derivative (PID) controller and applied to the model and their responses are compared with the existing PID controller. The PID controller response based on Physical model gives similar response of existing PID controller based real heat exchanger plant in comparison with SOPDT model. That means the Physical model is able to represent the heat exchanger plant dynamics more accurately than SOPDT model. For the controller, the FPD control gives a slight enhancement based on SOPDT model. Therefore, FPD controller is more suitable than PID controller.
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