This paper provides an alternative approach to solve model reference adaptive control problems of uncertain processes. Plants in this manuscript are described as polytopic LPV systems in fixed polytopes defined by con...
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ISBN:
(纸本)9780780397989
This paper provides an alternative approach to solve model reference adaptive control problems of uncertain processes. Plants in this manuscript are described as polytopic LPV systems in fixed polytopes defined by convex hulls of extreme systems, and uncertainties of system parameters correspond to those extreme systems. It is shown that control inputs are composed of weighted sums of control signals for each extreme systems, and that those weights are tuned adaptively. The stabilizing signals are also added to stabilize plants and to regulate the effect of time-varying components in uncertain processes. Those additional signals are derived as solutions of nonlinear H-infinity control problems for certain virtual systems.
This paper presents the design, analysis, and sensorless control of a new self-decelerating permanent-magnet (PM) machine based on magnetic-gear. The key is to integrate the magnetic gear with the PM machine while rem...
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ISBN:
(纸本)9781467324199
This paper presents the design, analysis, and sensorless control of a new self-decelerating permanent-magnet (PM) machine based on magnetic-gear. The key is to integrate the magnetic gear with the PM machine while removing the gear inner rotor. Hence, the proposed motor can achieve the low speed high torque output and high speed compact design requirements as well as high torque density with a simple structure. By using the finite element analysis (FEA), the static characteristics of the proposed motor are analyzed. In order to resolve the problems of using the mechanical sensors, various sensorless control algorithms for estimating rotor speed have been proposed. A method of modelreferenceadaptive system (MRAS) for sensorless control of this new self-decelerating PM motor is described, and the simulation results demonstrate the validity of this proposed algorithm.
In this research, the positioning control of a water hydraulic servo cylinder system with the simple adaptivecontrol (SAC) is discussed. Conventional model reference adaptive control (MRAC) also achieves good trackin...
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ISBN:
(纸本)9781467312752
In this research, the positioning control of a water hydraulic servo cylinder system with the simple adaptivecontrol (SAC) is discussed. Conventional model reference adaptive control (MRAC) also achieves good tracking performance for cylinder control, but the controller structure is much more complicated and has less robustness for disturbance in real application. Compared with MRAC, SAC has simpler and lower order structure, i.e. higher feasibility. In this paper, we examined and evaluated the control performance of SAC on a water hydraulic servo cylinder system. With the recent increased concerns over global environmental problems, the water hydraulic technique using pure tap water as a pressure medium has become a new drive source comparable to electric, oil hydraulic and pneumatic drive systems. This technique is also preferred due to its high power density, high safety against fire hazard in production plants, and easy availability. However, the main problems for precise control in a water hydraulic system are steady state errors and overshoot due to its large friction torque and considerable leakage flow. To compensate these effects, MRAC had been already applied and the better control performances were obtained. However, no result has been reported on SAC application for water hydraulics. To make clear the merits of SAC, tracking control performance and robustness were discussed via experimental results. It was confirmed that SAC gives 1) better tracking performance compared with PI control, and 2) comparable control precision with MRAC within 70 micrometers to the reference position and higher robustness for parameter change despite simple controller. These results ensure wider application of simple adaptivecontrol in real mechanical system.
In this paper, model reference adaptive control (MRAC) is proposed for a single-phase shunt active power filter (APF) to improve line power factor and to reduce line current harmonics. The proposed active power filter...
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Indirect matrix converter (IMC) fed interior permanent magnet synchronous motor (IPMSM) drive is a novel solution for AC adjustable-speed drives with high performance and high efficiency. Position sensorless vector co...
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ISBN:
(纸本)9781424480852
Indirect matrix converter (IMC) fed interior permanent magnet synchronous motor (IPMSM) drive is a novel solution for AC adjustable-speed drives with high performance and high efficiency. Position sensorless vector control technique is applied for the IMC fed IPMSM drive. modelreferenceadaptive system (MRAS) based rotor position estimation method is employed to estimate rotor position and speed. An anti-overflow algorithm is proposed to avoid the data overflow in the digital implementation of sensorless control. Simulations using MATLAB verify the effectiveness of the developed control methods. Some experimental results validate the practical feasibility of this drive system.
In industries now a day the control of chemical process is important craft. Mostly all the chemical process are highly nonlinear in nature this cause instability of the process. This paper deals with basic simulation ...
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Nowadays Lyapunov's second method is the most prevailing solution in adaptivecontrol problems. Despite of the idea being splendid, recently other solutions have come up which seem to be more beneficial in some ca...
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In this research, the positioning control of water hydraulic servo cylinder system with the simple adaptivecontrol (SAC) is discussed. Conventional model reference adaptive control (MRAC) also achieves good tracking ...
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In this paper we develop a state feedback Lyapunov-based design of direct model reference adaptive control (MRAC) for a special class of non-linear systems with input and state delays, based only on the lumped-delays ...
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Repetitive control (RC) has been widely used to track/reject periodic signal. However, RC alone fails to track any non-periodic reference signal. Another control scheme such as modelreferencecontrol (MRC) or model R...
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