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Performance of an extremum seeking electric machine based antilock braking (ABS) scheme is compared to mechanical braking based ABS. The advantage of the fast time constant (torque response) of an electric machine in an ABS application is quantified. A vehicle initiating a braking maneuver at a starting speed of 125kmph is considered. The vehicle stopping distance is reduced by 30% compared to mechanical...
This paper discusses the robust stabilization of a linear time-invariant system based on event triggering strategy. In most practical system, it is not possible to update control in continuous manner, so it is given to plant at some periodic discrete instants only. Recently, the event based control technique for control law update has become popular as it uses the resources efficiently while guaranteeing...
The paper proposes a new framework to learn a Fuzzy Logic Controller (FLC), from data extracted from a process while it is being manually controlled, in order to control nonlinear industrial processes. The learning of the FLC is performed by a hierarchical genetic algorithm (HGA). First, the fuzzy c-means (FCM) clustering algorithm is applied to initialize the HGA population, in order to reduce the...
Nowadays, the world trade volume is increasing. In many countries, the demand for container cranes is very high in order to handle the boomimg trade. The object of the crane system is to load containers between ships and shore. Operators need to convey containers safely and efficiently. However, operation of the crane system requires expert skill because of its underactuated system. Information of...
Dynamic Power Management and Dynamic Voltage and Frequency Scaling have been investigated during the last decades to reduce the power consumption of electronic circuits and systems. This paper proposes a new implementation of dynamic frequency scaling to manage the power consumption based on the occupancy level of a FIFO in a communication link between two components. Based on control theory, the...
This paper addresses the robust H∞ filtering problem for a class of Markov jump Lur'e systems with time-varying transition probabilities in discrete-time domain. The time-varying character of transition probabilities is considered to be finite piecewise homogeneous. A full-order filter is designed such that the resulting closed-loop systems are stochastically stable and have a guaranteed H∞ performance...
A high performance H∞ controller designed to control an Active Magnetic Bearing (AMB) system is considered in this paper. A digital signal processor (DSP) is used to implement the designed controller in real-time. The designed H∞ controller is compared with a conventional lead-lag type compensator and the on-board analogue controller of the AMB under various conditions and disturbances acting on the...
This paper investigates the robust control of two-link flexible manipulator systems subject to parameter perturbations, and a hybrid control scheme consisting of a continuous nonsingular terminal sliding mode (NTSM) controller and an observer-based LQR controller is proposed. In order to solve the non-minimum phase problem of flexible manipulator, singular perturbation method is utilized to decompose...
In the absence of aerodynamic pitch control, it is required to drive the wind turbine at an optimal speed for a given wind speed to extract maximum power from a wind turbine generator system. Due to unpredictable wind speed fluctuations, operating at maximum power point is a difficult task to undertake. This paper presents a maximum power point tracking (MPPT) algorithm for variable speed wind turbines...
This paper presents a nonlinear control strategy for single-phase universal active filters, using multiple reference frames. The control uses the concept of product demodulations and feedback linearization to circumvent realization problems of standard park transformation strategies and resonant controllers. However, similar to those, the present control allows achieving selective compensation and...
A fully instrumented surface vessel involving underactuated structure was designed. The problem of straight line course tracking of the underactuated surface vessel at a constant forward speed is addressed. The Serret-Frenet frame is used to define the tracking error, therefore the position tracking errors could be stabilized by stabilizing the single distance error. Least Squares Support Vector Machines...
This paper proposes an implementation method of reference governor. If the constrained variables at the steady state are 0, it is rather easy to compute the maximal output admissible set Ω∞. However, if the constrained variables at the steady state are not 0, then computing Ω∞ is very difficult. We do not compute the Ω∞, but we propose a parametric characterization of Ω∞. By using this characterization,...
This paper presents an energy optimization methodology applied on industrial plants with multiple energy carriers. The methodology combines an adaptive neuro-fuzzy inference system to calculate the short-term load forecasting of a plant, and the sequential quadratic programming algorithm to optimize its energy flow. Furthermore, the mathematical models of the plant's equipment are considered into...
A combinational method for calculation of dynamic parameters of a round rotor synchronous generator in an 80 MVA, 10.5 KV power plant based on synchronous reactance calculation from phasor measurements and using rated value of control room signals is developed in this paper. The results of this analytical method, in comparison with other methods show the efficiency and accuracy of the proposed method.
Distribution system reconfiguration (DSR) is a multi-objective, non-linear problem. This paper demonstrates the performance and effectiveness of a new, fast, non-dominated sorting genetic algorithm (FNSGA) for the purpose of solving the DSR problem by satisfying all objectives simultaneously with a relatively small number of generations and relatively short computation time. The objectives of the...
This paper describes the design of a PID-type Fuzzy Logic Controller (PID-FLC) and its application on the stabilization of an Active Magnetic Bearing System (AMB). The proposed PID-FLC is obtained by combining a PD-type Fuzzy Logic Controller (PD-FLC) and a Pi-type Fuzzy Logic Controller (PI-FLC). A multi-objective Genetic Algorithm (MOGA) is used to determine the scaling factors of the inputs and...
A particle filter based power system dynamic state estimation scheme is presented in this paper. The proposed method can be considered as an alternative to the other schemes which are mostly based on the Kaiman Filter. The particle filter approach can be used to estimate the states of nonlinear systems which are subjected to both Gaussian and non-Gaussian noise. Furthermore, the presented scheme has...
A stepper motor controlled tracking system is designed for microwave air bridging (MAB) for special communication antenna alignment under dynamic environment. Quick decision making on step changes leads to a successful system control. However, on aiming at the target, unstable problems may happen to the mechanics in oscillation. To improve the drawback, this paper presents a complex controller design...
An analytic model predictive control method is proposed to deal with a class of bounded uncertain nonlinear systems. Firstly, it can be redefined as the nominal system with uncertain model form, and the optimal control law with uncertainties is obtained. Derivation shows that the obtained control law is bounded and the analytic model predictive control that eliminates uncertainties is then able to...
A thrust allocation method with a functionality to assist power management systems by using the hull of the ship as a store of potential energy in the field of environmental forces has been recently proposed and demonstrated to work in simulation. This functionality allows the thrust allocation algorithm to decrease the power consumption in the thrusters when a sharp increase in power consumption...
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