In the paper, an analysis of the state-of-the-art of active elements for analog signal processing is presented which support - in contrast to the conven tional operational amplifiers - not only the voltage-mode but also the current- and mixed-mode operations. Several pro blems are addressed which are associated with the utiliza tion of these elements in linear applications, particularly in frequency filters. A methodology is proposed which generates a number of fundamentally new active elem ents with their potential utilization in various areas o f signal processing.

Active Elements for Analog Signal Processing: Classification, Review, and New Proposals

Control strategies for crane systems: A comprehensive review

Water for energy

Design of sliding mode control for quadruple-tank MIMO process with time delay compensation

Fractional-Order Sliding Mode Controller Design for a Modified Quadruple Tank Process via Multi-Level Switching

This paper presents a new method for designing the PIDA (Proportional-Integral-Derivative-Acceleration) Controller for a third order system. The results from simulations shown that all desired specifications can easily met by changing only one parameter. Comparing of the performances of the closed-loop in continuous-time system from this new simple method called “Kitti's Method” with the design technique proposed by Richard C. Dorf, it shown that not only faster with smaller or no overshoot response can be obtained but also the closed-loop system is robustly stable guaranteed. All merits of Kitti's Method are also being held with incorporated Root Locus Technique in discrete-time control systems design.

PIDA Controller designed by Kitti's Method

This paper presents the approach to design PID controller for a modified quadruple-tank process using inverted decoupling technique. In case of non-minimum phase, TITO system, such as modified quadruple-tank process which can't be controlled by PID controller with standard decoupling technique because the system can't be stabled by saturating manipulate signal. With the proposed method, The inverted decoupling controllers, decreasing the cross coupling between inputs and outputs, transform TITO plant transfer function model into SISO form so that SISO controller for each SISO model can be designed by Root Locus Technique easily and efficiently. PID controller with inverted decoupling can stabilize an unstable non-minimum-phase system and minimize several undesirable influences from an interaction in TITO process. The results from control system design can be illustrated by the experiments.

http://ieeexplore.ieee.org/iel5/6093620/6106068/06106138.pdf

Design of PID controller for the modified quadruple-tank process using inverted decoupling technique

This paper presents the realization of a four-terminal floating nullor (FTFN), which is simple configuration comprised three OTAs. The external bias currents of the OTAs can electronically adjust the current gain of the proposed FTFN. The realization method is suitable for implementation in monolithic integrated form. To demonstrate the circuit performances, the proposed FTFN was simulated by the use of the PSPICE analog simulation program and implemented using the commercially available OTAs. The simulation and experimental results verifying the performances of the proposed circuit are agreed with the theoretical values. Some application example in the design of the proposed FTFN as electronically tunable active element are also included.

/pdf/electronically-tunable-current-gain-ftfn-using-otas-50h8dpwpab.pdf

Electronically Tunable Current gain FTFN using OTAs

The optimal H2 control of oscillatory systems via the constraints of the derivatives of state variables is discussed and applied to a physical system in this paper. It is shown that the derivative state constrained optimal H2 control can be reduced into the standard optimal H2 control problem with modified controlled output equations. The solution to the modified standard problem has salient features for controlling oscillatory systems that have been a tough subject in state space as well as in classical frequency domain controls.The results obtained in the paper suggest the directions how to select the constraining weights in the standard state space control designs of oscillatory systems.The application of this approach to the control of a two-inertia resonance system is shown to demonstrate the proposed schemes.

https://www.jstage.jst.go.jp/article/ieejias1987/120/6/120_6_775/_pdf

Derivative State Constrained Optimal H2 Control for Oscillatory Systems and its Application

This paper presents a design method for robustness stability results of unstable systems using forward controller employed to PID × (n-2)/2 Stages PDA Controllers which applied to integral servo problem, both continuous and discrete-time control systems, the root loci of this design method are shown the robustness results with the excellence transient response of this closed loop systems, moreover, in case of increasing controller loop gain, the system is still robustly stabilizable with better performance.

http://ieeexplore.ieee.org/iel5/5656240/5669634/05669859.pdf

Thanit Trisuwannawat

Papers

PIDA Controller designed by Kitti's Method

Design of PID controller for the modified quadruple-tank process using inverted decoupling technique

Electronically Tunable Current gain FTFN using OTAs

Derivative State Constrained Optimal H2 Control for Oscillatory Systems and its Application

Discrete time robust integral servo with PID × (n-2)/2 Stage PDA Controllers for unstable systems