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This paper examines the accuracy of the zero-order hold (ZOH) model of the digital pulsewidth modulator (DPWM). The influence of the computational delay on the precision of this equivalent DPWM model is discussed in detail. A compensation method is proposed to compensate the deviation of this DPWM model for accurately calculating the stability region with different computational delay and duty-cycle...
The FOTF toolbox for MATLAB is proposed for research of fractional control systems in this article. For the technical realization of fractional controllers, it is proposed to approximate the transition functions by difference equations. For this purpose, the method of z-transform is used with the discrete integrator approximations. Telescope control system was use as the testing object of investigation...
A verification methodology is described and evaluated to formally determine uncertain linear systems stability in digital controllers with considerations to the implementation aspects. In particular, this methodology is combined with the digital-system verifier (DSVerifier), which is a verification tool that employs Bounded Model Checking based on Satisfiability Modulo Theories to check the stability...
This paper presents the results of testing an advanced control method, Internal Model Control (IMC) on wastewater pH neutralization process. Because the process has a strong nonlinearity it was modeled using different linear models for different operating ranges so that the IMC controller can use the adequate model parameter values according to the current operating range. The results obtained using...
Availability of an accurate and robust dynamic model is essential for implementing the model dependent process control. When first principles based modeling becomes difficult, tedious and/or costly, a dynamic model in the black-box form is obtained (process identification) by using the measured input-output process data. Such a dynamic model frequently contains a number of time delayed inputs and...
The presence of delays makes system analysis and control design much more complicated. Delays deteriorate the control performance and could destabilize the overall system in the theory of discrete-time signals and dynamic systems. Whenever a computer is used in measurement, signal processing or control applications, the data as seen from the computer and systems involved are naturally discrete-time...
This paper deals with the identification of fractional models with one fractional parameter. This kind of models are capable to represent an extensive range of dynamics, including overdamped and oscillatory behaviors. The identification algorithm consists in applying an optimization function, starting from an initial point, that allows the program to calculate a very representative model of the process...
In this paper, a robust nonlinear tracking control design for an ionic polymer metal composite (IPMC) is proposed by using a multi-objective particle swarm optimization-based robust right coprime factorization approach. Addressing the difficult in obtaining the PI control parameters (Kp, Ki) of the former proposed nonlinear robust tracking control system based on PI-based robust right coprime factorization...
In recent years, new control approaches have emerged to replace or augment conventional control engineering methods. The paper presents design, verification and comparison of two advanced methods (IMC, MPC) applied in the control of dynamic processes with complex dynamics. Development of advanced control methods based on robustness, optimality and prediction is an important and challenging task. The...
In industry the model predictive control (MPC) solutions are for their high computational requirements usually implemented to the PC-based devices. The main goal of our study is to implement an MPC algorithm to the programmable logic controller (PLC). This paper describes an initialization part of our solution, which represents an internal model pre-processing algorithm implemented to the function...
In the paper the Internal Model Control approach for ship autopilot system is presented. The proposed course controller employs the structure of the cascade system. The internal model of the plant and its inverse are estimated by neural network what made it possible to reduce the uncertainty of the control process. The ship model contains the saturation of the rudder angle and the rudder rate. Therefore...
The v-gap analysis can be used to analyze the achievable robustness for a control system before designing any controllers. In its unweighted form, the v-gap promises powerful results. However, for practical applications, dynamic weights must be introduced, and then the results are with respect to this given choice of weights. For this weighted case, H∞ analysis provides a simpler alternative and yields...
The design of robust controllers that guarantee prescribed hard bounds on the control signal when facing model uncertainty is considered. Our approach to avoid a conservative design is to describe the external signals quite accuratly by means of “admissible sets”, hard bounded in amplitude and rate. The core problem to solve is the calculation of the maximum output amplitude of a set of systems. This...
The converter is a power supply which controls the opening and closing time ratio of the switching tube in the use of modern power and electronic technology to maintain a stable output voltage. The converter generally consists of the composition of IC, MOSFET and Pulse Width Modulation (PWM). With the development and innovation of power electronic technology, converter technology has been also constantly...
This paper presents a comparison study for filter approximations and model reduction techniques for control systems of fractional orders. Oustaloup's recursive filter and a refined Oustaloup's filter are represented to obtain higher integer order approximations of fractional order systems. Then these higher integer order systems are exposed to model reduction with some existing techniques preserving...
Although periodicity simplifies design and analysis in control theory, it is no more adapted for embedded and networked cyber-physical systems because it results in a conservative usage of resources. Indeed, the control signal is computed and updated at the same rate regardless whether is really required or not, and is periodically sent on the communication link. On the other hand, event-driven sampling...
This paper deals with the design of third generation CRONE controller for a spherical tank system. Mathematical model of spherical tank system is derived. Based on the real time parameters transfer function model is obtained for different operating regions. Worst case model is computed and it is used for the design of third generation CRONE controller. Simulation runs of servo and regulatory responses...
In this paper, a decentralized PI controller design based on Characteristic Ratio Assignment (CRA) method for Two-Input-Two-Output (TITO) interacting processes is proposed. The design methodology uses decoupler to reduce the interaction between the variables, and the First Order Plus Dead Time (FOPDT) model is obtained for each decoupled subsystem. The independent diagonal controllers are computed...
Realization problem of active noise control system is studied in the article. The foundational theory and algorithm of active noise control are introduced, the feed-forward adaptive active noise control (AANC) system is presented, the hardware solution of the system is proposed by selecting TMS320VC5509 DSP as the controller. Using the C language, the active noise real-time control system is realized,...
The method of system simulation for analyzing fly condition of the missile has two advantages: it costs little, and the parameters can be set and recorded expediently. In this paper, the constitution method on simulation model of control system of certain missile is introduced for analyzing the fly condition of this missile. Firstly, principle and mathematic model are introduced based on the composition...
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