Active vibration control is an important problem in structures. One of the ways to tackle this problem is to make the structure smart, adaptive and self-controlling. The objective of active vibration control is to red...
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Active vibration control is an important problem in structures. One of the ways to tackle this problem is to make the structure smart, adaptive and self-controlling. The objective of active vibration control is to reduce the vibration of a system by automatic modification of the system's structural response. This work features the modeling and design of a robust decentralized controller for a smart flexible system using fast output sampling feedback control technique when there is a failure of a system component (say, an actuator) to function. In this proposed control law, the control inputs to each actuator of the multimodel is a function of the output of that corresponding sensor only and the gain matrix has all off-diagonal terms zero. The designed robust controller provides satisfactory stabilization of the multimodel smart structure system.
In this study, a new data-driven approach has been proposed for modeling and trajectory optimization of a batch or a semibatch process. The approach is based on parametrization of input and output trajectories as fini...
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In this study, a new data-driven approach has been proposed for modeling and trajectory optimization of a batch or a semibatch process. The approach is based on parametrization of input and output trajectories as finite-dimensional vectors using orthonormal polynomials (i.e., Fourier coefficients). Using input/output trajectory information available in historical databases, an artificial neural network (ANN) based model has been developed for capturing the dynamics of semibatch processes operated over a fixed interval of time. The parametrized input trajectories, initial states, and process parameters are considered as inputs to the ANN-based model, which predicts output trajectories in terms of Fourier coefficients. Single-rate as well as multirate systems can be modeled by this approach with equal ease. The resulting algebraic model is further used to formulate an optimal control problem, which can be solved using conventional nonlinear programming techniques to generate open-loop optimal input policies or optimal setpoint trajectories. The effectiveness of the proposed ANN-based modeling and trajectory optimization scheme is demonstrated using simulation studies on a benchmark multiple-input multiple-output semibatch process reported in the literature. Analysis of the simulation results reveals that the proposed ANN-based modeling approach is capable of capturing the nonlinear as well as the time-varying behavior inherent in the semibatch system fairly accurately. In addition, it also captures batch-to-batch variations in initial conditions and other process parameters. The results of operating trajectory optimization based on the proposed single-rate as well as the multirate ANN model are comparable to the results of trajectory optimization obtained using the exact first principles model.
The paper presents an algorithm for the discrete-time output feedback sliding mode control of time delayed systems with uncertainty. The proposed algorithm is capable of handling systems with both state and input dela...
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The paper presents an algorithm for the discrete-time output feedback sliding mode control of time delayed systems with uncertainty. The proposed algorithm is capable of handling systems with both state and input delay. The major advantage of the algorithm is that it is based on system output and hence more practical. Moreover, it reduces chattering by avoiding the usage of a switching input.
Recent results on higher order sliding mode control algorithms are applied to a permanent magnet (PM) Stepper Motor. Use of Sliding Mode control of an order higher than the relative degree of the sliding surface with ...
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Recent results on higher order sliding mode control algorithms are applied to a permanent magnet (PM) Stepper Motor. Use of Sliding Mode control of an order higher than the relative degree of the sliding surface with respect to the control results in complete chattering removal. Two flat outputs of the system are taken as the sliding variables which makes the implementation simple. However, full state feedback is required for the control.
This paper presents the voltage controller for induction generator (IG), to work with variable speeds and load, based on instantaneous power control (IPC). It is based on the concept of controlling the instantaneous r...
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This paper presents the voltage controller for induction generator (IG), to work with variable speeds and load, based on instantaneous power control (IPC). It is based on the concept of controlling the instantaneous real and imaginary power into the machine. This paper outlines the basic algorithm of IPC and presents simulation results of IG performance using Matlab/Simulink.
The aim of this paper is to develop a new method for sliding mode control of a class of discrete-time nonlinear systems that are feedback linearizable. One advantage of this method is that it allows the use of the rec...
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The aim of this paper is to develop a new method for sliding mode control of a class of discrete-time nonlinear systems that are feedback linearizable. One advantage of this method is that it allows the use of the recently developed output feedback sliding mode control strategy for linear systems to a class of nonlinear systems. The second advantage of this approach is that it can be used in situations where complete state information is not available or the use of dynamic compensator becomes essential.
This paper presents the design, fabrication of a microcontroller based resistance welding system which is used for performing a welding process. The paper is divided into 4 sections. First, a brief introduction to wha...
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This paper presents the design, fabrication of a microcontroller based resistance welding system which is used for performing a welding process. The paper is divided into 4 sections. First, a brief introduction to what is a welding, method of welding control such as resistance and spot welding is given. Secondly, the critical factors in the design of a welding process are dealt along with the principle of the welding process. Following this, the introduction to the design of the control scheme employed by us with the basic block diagram of the welding system and the functioning is presented. Thirdly, the design and development of the control software algorithm is dealt with. Finally, the conclusion is drawn along with its working and future improvements.
A grid connected power generation scheme using a 3-/spl Phi/ self-excited induction generator (SEIG) in conjunction with current controlled voltage source inverter (CC-VSI) is proposed The analysis employs two PI cont...
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A grid connected power generation scheme using a 3-/spl Phi/ self-excited induction generator (SEIG) in conjunction with current controlled voltage source inverter (CC-VSI) is proposed The analysis employs two PI controllers and one hysteresis current controller to control the stator terminal voltage and frequency of an IG. This paper also presents the reason for variation in magnetizing inductance L/sub m/ and its effect on the self-excitation process during transient condition. Simulation studies of the proposed system are carried out using Matlab/Simulink. Results obtained are presented illustrating the good control performance of the system.
This paper discusses the spatial controller design with periodic output feedback for a 540 MWe PHWR. The spatial model of the reactor developed in (Tiwari, 1999) is augmented with models for variation of coolant and f...
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This paper discusses the spatial controller design with periodic output feedback for a 540 MWe PHWR. The spatial model of the reactor developed in (Tiwari, 1999) is augmented with models for variation of coolant and fuel temperatures to form a 72 order model. This new model having 14 inputs and 29 outputs, is suitably reduced by aggregation method. Finally, a periodic output feedback control for the high order model is designed using the reduced model. The results of nonlinear simulations are presented.
A new three phase active commutated thyristor current source inverter (CSI) topology is proposed for grid connected photovoltaic systems. Space vector PWM with a special switching sequence, which ensures proper commut...
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A new three phase active commutated thyristor current source inverter (CSI) topology is proposed for grid connected photovoltaic systems. Space vector PWM with a special switching sequence, which ensures proper commutation of thyristors, is implemented. In order to suppress the natural frequency of oscillations of LC filter and to ensure stability of the system, a charge controller in synchronous rotating reference frame is described. This allows easy design of PI controller gains. The simulation results of a 7-kVA inverter are presented.
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