The influence of non-uniform magnetic field on the beam with magnetorheological fluid is used to build the vibration control algorithms. A special laboratory stand with appropriate electromagnet was built to test free...
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The influence of non-uniform magnetic field on the beam with magnetorheological fluid is used to build the vibration control algorithms. A special laboratory stand with appropriate electromagnet was built to test free and forced vibrations of the beam with and without control. Experiments were done to determine the stiffness and damping parameters of the beam for various currents flowing in electromagnet coils. A vibration control algorithm was proposed, based on the system identification data and using the averaging technique of nonlinear system analysis.
This paper aims to present the throttle valve, in which a piezoelectric stack was used for adjustment of the flow section area of the throttle aperture. The valve was built based on a proprietary design, using the com...
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This paper aims to present the throttle valve, in which a piezoelectric stack was used for adjustment of the flow section area of the throttle aperture. The valve was built based on a proprietary design, using the components of a standard manufactured overflow valve. Laboratory tests were carried out to establish the valve's characteristics, describing its usefulness for control of small flow intensity. LabView software was used for measuring the data gathered. The test results, after conversion, were developed using the Matlab/Simuling software package. This paper presents the most notable results of the tests of a valve equipped with a high-voltage piezoelectric stack. Based on the results obtained, the functional correlation between the volumetric flow rate, pressure drop in the throttling aperture and control signal input to the piezoelectric stack were determined.
This article presents mechanical vibrations exciter, which is electrohydraulic device designed to extorting bi-axial vibrations. The priority task of exciter is to excite physical model with related to exploitations r...
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This article presents mechanical vibrations exciter, which is electrohydraulic device designed to extorting bi-axial vibrations. The priority task of exciter is to excite physical model with related to exploitations real conditions parameters of signals The building of working device and his important assemblies are described. The most important part of exciter is electrohydraulic control system which ensures the obtainment of required parameters of generated signal. Exciter is compound from: mechanical construction, two servomechanisms, station of hydraulic power supply, electric power supply and control system. The possibility of built device with can extorting vibrations of horizontal platform both in one, as in two axis was introduced. For end the results after two years of exploitation were showed.
This paper is concerned with the stabilization problem of Takagi-Sugeno (T-S) fuzzy descriptor systems. The imperfect premise matching method is used in which T-S fuzzy plant and controller do not share same premise r...
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This paper is concerned with the stabilization problem of Takagi-Sugeno (T-S) fuzzy descriptor systems. The imperfect premise matching method is used in which T-S fuzzy plant and controller do not share same premise rules, i.e membership functions of plant and controller are different. By this method, the conservativeness of the stabilization conditions are reduced and flexibility in controller design is increased. Also, the larger class of systems than the conventional model can be described by the descriptor approach. The sufficient stabilization conditions are derived in terms of linear matrix inequalities (LMIs) which are solved easily by the LMI-toolbox in Matlab. The inverted pendulum simulation example is used to demonstrate the effectiveness of the proposed approach.
The paper presents an effective method for indirect linearization based on a three-loop control system. This approach, due to robustness exhibited by the structure, enables one to determine a nonlinear component of th...
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This paper investigates passivity-based pose control via an obstacle avoidance navigation function for three-dimensional (3-D) eye-in-hand visual feedback systems. Firstly, visual motion observer-based pose control fo...
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The cable-driven mechanism is usually used in robotic systems for the efficient transmission of forces or torques from actuators to the end-effector. However, the control design is challenging for these systems due to...
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This paper presents output feedback stabilization condition for nonlinear using artificial Takagi-Sugeno (T-S) fuzzy systems. Continuous membership functions of the T-S fuzzy model are represented by staircase ones. S...
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This paper presents output feedback stabilization condition for nonlinear using artificial Takagi-Sugeno (T-S) fuzzy systems. Continuous membership functions of the T-S fuzzy model are represented by staircase ones. Stabilization condition in terms of linear-matrix-inequalities (LMIs) formulation is derived using the artificial T-S fuzzy model and Lyapunov function. controller gains of output feedback T-S fuzzy systems are obtained using LMIs solutions. Finally, simulation example is given to illustrate the merits of the proposed method.
Wind energy is currently the fastest growing source of renewable energy used for electrical generation around world. Wind farms are adding a significant amount of electrical generation capacity. The increase in the nu...
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ISBN:
(纸本)9781467327428
Wind energy is currently the fastest growing source of renewable energy used for electrical generation around world. Wind farms are adding a significant amount of electrical generation capacity. The increase in the number of wind farms has led to the need for more effective operation and maintenance procedures. Condition Monitoring System (CMS) can be used to aid plant owners in achieving these goals. Its aim is to provide operators with information regarding the health of their machines, which in turn, can help them improve operational efficiency. In this work, wind turbine fault detection system based on wind vs. power performance curve obtained from SCADA is studied. Considered fault detection scheme utilizes artificial neural network for training normal behavior of wind turbine system. Furthermore, In order to verify the effectiveness of the performance curve based fault detection scheme, SCADA data obtained from 850kW wind turbine system installed in Kunsan Korea are used and various simulation studies were carried out.
In this paper, an observer-based decentralized fuzzy controller design is presented for the stochastic stabilization of the discrete-time large-scale fuzzy systems with packet losses. Based on the large-scale Takagi-S...
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In this paper, an observer-based decentralized fuzzy controller design is presented for the stochastic stabilization of the discrete-time large-scale fuzzy systems with packet losses. Based on the large-scale Takagi-Sugeno (T-S) fuzzy system, the fuzzy observer and controller are designed and the stochastic stability condition of the closed-loop system is derived in Lyapunov sense. Its sufficient conditions are formulated in terms of linear matrix inequalities. Finally, a numerical example is provided to verify the effectiveness of the proposed technique.
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