The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A new method for designing the centralized proportional-integral-derivative (PID) controllers in two-input two-output (TITO) processes is proposed. The proposed method has two diagonal part PID controllers and two off-diagonal part PID controllers. The diagonal part PID controllers are to attenuate the interactions of the TITO processes and the off-diagonal part PID controllers are to track the setpoint...
This paper presents a new strategy of PID autotuning which is combined with an operational optimization for Molten Carbonate Fuel Cell (MCFC) systems to track the power demand with high efficiency. The PID auto-tuning methodology is based on frequency response identification and a model reduction to a fractional low order model. And the operational optimization problem is formulated by a radial basis...
A new non-parametric process identification method is proposed to obtain the discrete-time frequency response model from process input and output data. Existing discrete-time Fourier transform approach can be applied to only the case that the initial part and the final part of the process data are zero-steady-state. The proposed method using a new transform can estimate the frequency response model...
Process Identification and PID Control enables students and researchers to understand the basic concepts of feedback control, process identification, autotuning as well as design and implement feedback controllers, especially, PID controllers. The first The first two parts introduce the basics of process control and dynamics, analysis tools (Bode plot, Nyquist plot) to characterize the dynamics of...
The original relay autotuning method of Astrom and Hagglund [1] is based on the Nyquist point at the phase angle of -square (the critical frequency). Recently Friman and Waller [8] have shown that the critical frequency is too high for PI controllers and proposed an autotuning method that finds a Nyquist point at the third quadrant through the two-channel relay and tunes PI/PID controllers. Here,...
If there is noise in the original relay feedback system, because of chattering, it is not easy to obtain accurate ultimate information. To prevent chattering of the original relay output, hysteresis relay feedback method could be used. However, its relay output switching time is fluctuant and the average of switching time is different from the ultimate period. Thereby, here, we propose a chattering-free...
A new prediction error identification method is proposed to identify multi-input-multi-output (MIMO) processes and the initial state. It linearizes the model output with respect to the model parameters so that optimal model parameters can be obtained in an analytic way. And, it has potential to provide a faster convergence rate and a better local minimum in solving the nonlinear optimization problem.
A new supervisory training rule for the multilayered feedforward neural network (FNN) using local linearization and analytic optimal solution is proposed. The cause of the nonlinearity of the neural network in the training is pinpointed and the nonlinearity is removed by a local linearization. And, the optimal solution of the linearized FNN minimizing the objective function for the training is analytically...
The relay feedback method is now widely used in tuning proportional-integral-derivative controllers automatically. It usually uses point data such as the oscillation amplitude. As in the step response method which uses areas instead of point data, area and moment data of relay feedback response can also be used to extract process information. Here we propose identification methods involving various...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.