Chanin Panjapornpon

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This paper presents a control method for handling a coupling effect between the liquid level and pH of the process with multi-titrated concentrations, which an outflow and titrating streams are manipulated inputs. A feedback controller formulated by using input/state (I/S) linearization and optimization technique is used to calculate control actions and(More)
This paper presents a nonlinear control system that is applicable to stable and unstable processes, whether non-minimumor minimum-phase. The closed-loop stability is ensured by forcing every process state variable to follow a desired linear response. This approach results in a nonlinear state feedback that induces approximately linear responses to the state(More)
This article proposes a controller design method for the continuous stirred-tank reactor (CSTR) in the biodiesel process. First, the dynamics model of the reactor in the biodiesel continuous process is presented. Then, a controller design method, using both input-output linearization method and PD method, is presented to control the concentration of the(More)
This paper presents a new control scheme for an uncertain nonlinear system with input delay. A two-degree-of-freedom control structure with a time-delay compensator is applied to controller synthesis for handling setpoint tracking and disturbance rejection independently. An input/output linearizing controller based on a disturbance-free model is used to(More)
In this work, a new control method for uncertain processes is developed based on two-degree-of-freedom control structure. The setpoint tracking controller designed by input/output linearization technique is used to regulate the disturbance-free output and the disturbance rejection controller designed is designed by high-gain technique. The advantage of(More)
This research proposes a study of Nonlinear Feedback Linearization-Based PI controller for a continuous pH process system. We control the pH by filling in a reactor tank with wastewater and sodium hydroxide (NaOH) 1.25% by-weight. The system then keeps track of the pH to the desired values. However, since the system is inherently nonlinear and highly(More)
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