This paper introduces an analytical formulation to describe QFT templates based on Fourier series. This allows to calculate the template contour of plants with a high number of uncertain parameters. The proposed solut...
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This paper introduces an analytical formulation to describe QFT templates based on Fourier series. This allows to calculate the template contour of plants with a high number of uncertain parameters. The proposed solution consists of performing operations between analytical sub-templates. This saves calculation time and allows to work with an infinite set of plant values.
This paper introduces a reformulation to design full-matrix Quantitative Feedback Theory (QFT) controllers for multi-input-multi-output (MIMO) plants with model uncertainty. It considers a double-step procedure: an in...
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This paper introduces a reformulation to design full-matrix Quantitative Feedback Theory (QFT) controllers for multi-input-multi-output (MIMO) plants with model uncertainty. It considers a double-step procedure: an inverse-based decoupling and a consecutive loop-by-loop quantitative robust control design. The method generalizes several previous non-diagonal MIMO QFT techniques, avoiding some required prior hypotheses of such former methods, and simplifies the design procedure. It deals with two classical control problems: reference tracking and disturbance rejection at plant output. The paper ends applying the new technique to the design of a MIMO controller for a spacecraft flying in a formation that is moving with respect to a central body in a circular orbit.
This paper deals with comparative study of two structures of two liquid level control, that are PD fuzzy control and PD control. The classical control theory which relies on the mathematical model of the underlining s...
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This paper deals with comparative study of two structures of two liquid level control, that are PD fuzzy control and PD control. The classical control theory which relies on the mathematical model of the underlining system has been successfully applied to the control of a large variety of simple plant, therefore the PD fuzzy control that has two input variables and one output variable based on Mamdani inference system using 49 full rules base was introduced to compare it with the conventional one. The main idea from using PD fuzzy control is to build a model of an expert operator who is capable of controlling the plant without thinking in terms of mathematical model. A comparison well detailed in the application of these two control strategies on liquid level problem is presented [4].
This article presents an extended modeling approach for piezoelectric tube actuators combining finite element analysis (FEA) and model order reduction (MOR) techniques. The model includes the full coupling between mot...
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This article presents an extended modeling approach for piezoelectric tube actuators combining finite element analysis (FEA) and model order reduction (MOR) techniques. The model includes the full coupling between motion in all axes, while the reduced model order, which depends mainly on the desired bandwidth and model accuracy, makes it a suitable basis for controller design purposes. Simulation results in the frequency domain are compared to measurements and show an excellent agreement in a wide frequency range. The increase of scan accuracy in closed-loop operation is demonstrated by simulation data of a model-based H infin controller.
Reliable decentralized stabilization is considered for general multi-channel plants, where the objective is to maintain stability of the closed-loop system when all of decentralized controllers work together and when ...
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Reliable decentralized stabilization is considered for general multi-channel plants, where the objective is to maintain stability of the closed-loop system when all of decentralized controllers work together and when one of the controllers is extracted due to a failure. A dilated LMI technique is employed for deriving reliable state feedback design, while a version of unknown disturbance observer is used as a decentralized observer for extending the design to output feedback case. Advantages and usefulness of the proposed method are demonstrated through an application to a power system.
The American Institute of Industrial Engineering formulated in 1955 the following paradigm for Manufacturing Systems: conceptual and detailed design, as well as socio- technologic- economic systems including heterogen...
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The American Institute of Industrial Engineering formulated in 1955 the following paradigm for Manufacturing Systems: conceptual and detailed design, as well as socio- technologic- economic systems including heterogeneous resources (human, financial, technologies, capital, energy resources). During the last five decades many paradigm shifts have been identified. The paper is focused on the current achievements sustaining the time of convergence for different recent paradigm shifts. The authors do believe that Intelligent Autonomous Manufacturing Systems should be an appropriate purpose within global digital eve.
Systems with multiple models or multi-controller structure and inverse model represent two of the successful solutions for the real-time control of the nonlinear or multi-regime processes. The use of these structures ...
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Systems with multiple models or multi-controller structure and inverse model represent two of the successful solutions for the real-time control of the nonlinear or multi-regime processes. The use of these structures imposes solving some specific problems, like best algorithm selection, control algorithm switching or inverse model identification. The paper proposes a comparison between the methods of designing and implementation for multiple models and inverse model command. The applicability of the method is proved using a real-time structure with an RST control algorithm. In the end, its software implementation is also shown.
In data stream management systems (DSMSs), request handling has to meet various QoS requirements. Traditional open-loop DSMS ignores system status information and run-time history in decision making and is unable to a...
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In data stream management systems (DSMSs), request handling has to meet various QoS requirements. Traditional open-loop DSMS ignores system status information and run-time history in decision making and is unable to achieve stable QoS performance over run-time as the workload or environment changes. This paper discusses the design of a close-loop DSMS that applies adaptive control in control theory to adapt itself to the changing environment and workloads in order to optimize the QoS performance over run-time. The proposed adaptive DSMS is built on system identification and successive approximation knowledge in control theory and uses a least square approach for parameter estimation. Experimental data shows that the proposed adaptive DSMS outperforms the traditional open-loop DSMS in overall QoS among various network conditions and workload settings.
Global synchronization of coupled map lattices are investigated in this paper. A sufficient condition for global synchronization is derived. Unlike other approaches, the coupled lattices is not linearized in this pape...
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Global synchronization of coupled map lattices are investigated in this paper. A sufficient condition for global synchronization is derived. Unlike other approaches, the coupled lattices is not linearized in this paper. Instead, the sufficient condition for the synchronization is obtained here by introducing a reference state along with Lyapunov function method, and this condition is simply given in terms of the maximum absolute value of eigenvalues of the coupling matrices those are not equal to one. Moreover, we give how to construct the coupling matrix to guarantee global synchronization of coupled map lattices based on two comparing matrices, which is very convenient to use. A typical example of coupled map lattices with chaotic nodes is finally used to verify the theoretical results and the effectiveness of the proposed synchronization scheme.
This paper presents a strategy for modeling and simulation of the hydro-energetic dam dynamics. The useful information for the evaluation of the mathematical models is represented by a data set collected for twenty ye...
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This paper presents a strategy for modeling and simulation of the hydro-energetic dam dynamics. The useful information for the evaluation of the mathematical models is represented by a data set collected for twenty years from one of the hydro-energetic systems in Romania. The results of our work allow the evaluation of the present state of this system and offer some important information for the computer-aided design of similar systems. These results have been obtained using software tools dedicated to data acquisition, modeling and identification.
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