This paper introduces an optimal consensus control scheme for nonlinear multi-agent systems with completely unknown dynamics. In general, it is difficult to solve the coupled Hamilton-Jacobi-Bellman (HJB) equations, w...
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ISBN:
(纸本)9789881563958
This paper introduces an optimal consensus control scheme for nonlinear multi-agent systems with completely unknown dynamics. In general, it is difficult to solve the coupled Hamilton-Jacobi-Bellman (HJB) equations, which the optimal consensus control relies on in multi-agent systems, especially unknown nonlinear systems. For the purpose of solving the problem, we propose an optimal consensus control approach based on the model reference adaptive control (MRAC) and adaptive dynamic programming (ADP). Using the structure of the diagonal recurrent neural network, the identifier and controller are devised to achieve MRAC for every plant of the unknown nonlinear systems, i.e. the referencemodel serves as a dynamic model of each individual agent. Then, according to referencemodels of distributed agents, an adaptive dynamic programming (ADP) is introduced to approximate the solution of the coupled HJB equations.
model reference adaptive control of dynamical systems with unstructured system uncertainties and unmodeled dynamics is considered in this paper. Specifically, a stability tradeoff for this class of dynamical systems i...
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ISBN:
(纸本)9781538679012;9781538679265
model reference adaptive control of dynamical systems with unstructured system uncertainties and unmodeled dynamics is considered in this paper. Specifically, a stability tradeoff for this class of dynamical systems is shown first. With the goal of relaxing the resulting stability tradeoff, adaptive robustifying terms are designed next. The key aspect of the proposed relaxation procedure is that the proposed terms guarantee closed-loop system stability even with respect to significant system uncertainties, subject to unmodeled dynamics satisfying a condition. An illustrative numerical example is further given to demonstrate our theoretical findings.
The 1MWth Reactor TRIGA PUSPATI (RTP) Mark II type has undergone more than 35 years of operation. The existing core power control uses feedback control algorithm (FCA). It is challenging to keep the core power stable ...
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The 1MWth Reactor TRIGA PUSPATI (RTP) Mark II type has undergone more than 35 years of operation. The existing core power control uses feedback control algorithm (FCA). It is challenging to keep the core power stable at the desired value within acceptable error bands to meet the safety demand of RTP due to the sensitivity of nuclear research reactor operation. Currently, the system is not satisfied with power tracking performance and can be improved. Therefore, a new design core power control is very important to improve the current performance in tracking and regulate reactor power by control the movement of control rods. In this paper, the adaptivecontroller and focus on model reference adaptive control (MRAC) and Self-Tuning control (STC) were applied to the control of the core power. The model for core power control was based on mathematical models of the reactor core, adaptivecontroller model, and control rods selection programming. The mathematical models of the reactor core were based on point kinetics model, thermal hydraulic models, and reactivity models. The adaptivecontrolmodel was presented using Lyapunov method to ensure stable close loop system and STC Generalised Minimum Variance (GMV) controller was not necessary to know the exact plant transfer function in designing the core power control. The performance between proposed adaptivecontrol and FCA will be compared via computer simulation and analysed the simulation results manifest the effectiveness and the good performance of the proposed control method for core power control.
The proposed paper introduces the design of an adaptive augmentation of an Unmanned Aerial Vehicle's (UAV) Flight control System (FCS). A Linear Quadratic Regulator (LQR) algorithm has been employed as a base-line...
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ISBN:
(纸本)9781538641125
The proposed paper introduces the design of an adaptive augmentation of an Unmanned Aerial Vehicle's (UAV) Flight control System (FCS). A Linear Quadratic Regulator (LQR) algorithm has been employed as a base-line control strategy and enhanced with an adaptation loop based on a model reference adaptive control (MRAC) technique.
In the controlling three phase AC motor especially permanent magnet synchronous motor (PMSM), good controller is required to achieved the desired target of speed. This paper presents a comparison among different techn...
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In the controlling three phase AC motor especially permanent magnet synchronous motor (PMSM), good controller is required to achieved the desired target of speed. This paper presents a comparison among different technique of speed and position estimation by using Proportional and Integral controller (PI) tune by using Heuristic, MATLAB PID auto tuner and Particle Swarm Optimization (PSO) method of sensorless control for PMSM. The reason of this study is to identify which method can produce better result. Simulation that have been conducted by using PSO optimization technique h produced better result than the conventional controller in terms of system parameter such as rise time (Tr), settling time (Ts), percent overshoot (%Os), percent undershoot (% Us) and root mean square error (RMSE) of PMSM.
Sensorless control of electrical machines are now extensively used not only in motoring mode but also preferred in power generation due to its smaller size with lower maintenance and cost. This requires the sensorless...
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ISBN:
(纸本)9781728139593
Sensorless control of electrical machines are now extensively used not only in motoring mode but also preferred in power generation due to its smaller size with lower maintenance and cost. This requires the sensorless control scheme for speed estimation to be investigated extensively in various aspects. Therefore, the paper presents the performance evaluation of closed loop modelreferenceadaptive system (MRAS) based sensorless scheme for speed estimation in induction machine drive using field oriented control. Operation of induction machine drive has been investigated for parametric variation and current harmonic content in both generating and motoring mode in MATLAB/Simulink environment.
This work proposes an adaptive Haptic Aid system that adapts the amount of provided aid based on actual pilot performance. This is achieved by parameterizing the haptic system and adjusting the parameters on-line to m...
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ISBN:
(纸本)9781538679012;9781538679265
This work proposes an adaptive Haptic Aid system that adapts the amount of provided aid based on actual pilot performance. This is achieved by parameterizing the haptic system and adjusting the parameters on-line to match a desired closed loop performance. The parameters of the haptic aid are adjusted using a technique known as model reference adaptive control (MRAC), which has been widely studied in past years and applied to automatic control of plants with unknown dynamics. Simulations and experimental tests with naive and expert pilots show that the proposed adaptive Haptic Aid system represents a promising solution for haptic aid design.
A design of two-wheeled robot (TWR) stabilization system using model reference adaptive control (MRAC) method is presented. A TWR is a statically-unstable non-linear system that requires an active stabilization system...
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ISBN:
(纸本)9781538650943
A design of two-wheeled robot (TWR) stabilization system using model reference adaptive control (MRAC) method is presented. A TWR is a statically-unstable non-linear system that requires an active stabilization system to operate. The active stabilization system is a state feedback control system. MRAC is applied to design the TWR active stabilization system. MRAC is an adaptivecontrol scheme which has an adaptation mechanism to make a plant as a control object to behave following a referencemodel. Performance of the designed stabilization system is demonstrated through computer simulation. The simulation results show that the designed system is able to stabilize the TWR and even when some disturbances are presented.
If a fault occurs in flight control system of commercial aircraft, it will lead to a catastrophic consequence. So, it is necessary to establish an effective fault tolerant control(FTC). In this paper, an adaptive FTC ...
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ISBN:
(纸本)9781538611715
If a fault occurs in flight control system of commercial aircraft, it will lead to a catastrophic consequence. So, it is necessary to establish an effective fault tolerant control(FTC). In this paper, an adaptive FTC was proposed. First, we built a fault aircraft model with actuator faults and introduced the Oscillatory Failure Case(OFC) fault. Then an adaptive FTC was designed which applied the method of model reference adaptive control. Finally, we established a commercial aircraft model of B747 and verified the performance of the adaptive strategy through simulation.
This paper presents an L 1 adaptivecontrol methodology of the Stewart-Gough flight simulator platform in the task space. The controller has a low-pass filter in feedback-loop to avoid high frequencies in the control...
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ISBN:
(纸本)9781728125992
This paper presents an L 1 adaptivecontrol methodology of the Stewart-Gough flight simulator platform in the task space. The controller has a low-pass filter in feedback-loop to avoid high frequencies in the control signals, and the required transient performance can be enhanced by increasing the adaptive gain, which can improve the transient and smoothness of flight simulator platform. The performance of L 1 adaptivecontroller is obtained by comparing with traditional model reference adaptive controller (MRAC). And some additional simulations are carried out to show the performance of the controller.
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