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This paper discusses the distance relay mal-operation in the case of installation of Static Synchronous Series Compensator (SSSC) which is categorized as a series connected Flexible Alternating Current Transmission System (FACTS) device, on second circuit of a double circuit transmission line. This is done by presenting the measured impedance at the relaying point in the case of SSSC presence at the...
Consider about the trade-off between cost and accuracy, lots of works investigate into the inertial measurement system (IMS) and Global Position System (GPS) fusion. However, with the necessary to insure the long-term on-board working precision it results in a complication between the time-consuming and complex calculation in the system design. Therefore timing has become a critical problem in the...
This work deals with the problem of force regulation and position trajectory tracking for a robot in compliant contact under kinematic uncertainties. A robotic finger with a soft hemispherical tip of uncertain compliance is considered in contact with a rigid flat surface of unknown position and orientation. A novel adaptive controller is proposed and is proved to achieve the convergence of force and...
Friction Stir Welding (FSW) in 3-dimensions, due to process constraints, requires an off-line programming approach. The creation of tool paths based on computer aided models for cutting, machining or traditional welding, exists in numerous of applications. But since FSW, until recently, have not been a 3-dimensional application, no proper solution for this process exists. In this paper we propose...
This paper presents a simple controller design methodology in the frequency domain for disturbance rejection specifications. It captures the main characteristics at low and high frequencies of a Disturbance Observer Based Control, and solves some of their principal drawbacks in terms of stability and performance specifications, quantifying the inherent limitations for disturbance rejection by means...
The control of unstable second order plus deadtime (USOPDT) processes systems using generalized PID type controllers is investigated in this paper. New tuning rules based on the exact satisfaction of gain and phase margin specifications are proposed. The tuning rules are given in the form of iterative algorithms, as well as in the form of accurate analytic approximations, particularly useful for on-line...
This paper focuses on the application of steady-state operability to Model Predictive Control (MPC) of the Shell Heavy Oil Fractionator (SHOF) control problem. Operability for non-square systems is a relatively new area in the literature, and investigation into its applicability for higher order dimensions has not yet been addressed. This was done primarily to assess steady-state operability as a...
This paper introduces a framework for addressing neurological disorders and specifically epilepsy. One percent of the world’s population is experiencing epileptic seizures a large percentage of which cannot be cured via medication or surgery. Recent advances in brain research have demonstrated the efficacy of monitoring via intracranial electroencephalogram (IEEG) epileptiform activity and the ability...
This study deals with the force and motion control of a spatial three-link articulated manipulator with flexible second and third links. In order to reduce the complexity of the dynamic equations each link is modelled as if unconnected and the joint connections are expressed as constraint equations. Then the joint forces are eliminated and the number of equations is reduced by substituting the acceleration...
In this paper we propose a method for delay approximation in stochastic Petri nets. The method is based on utilization of Coxian distribution and least square fitting criteria. The problem is reduced to a direct parameters identification. Two examples illustrate the method application. The first one demonstrates approximation of power outage duration at a 200 MW power plant unit. Degree of a phase-type...
This paper gives the full dynamical model of a commercially available quadrotor rotorcraft and presents its behavior control at low altitudes through sliding mode control. The control law is very well known for its robustness against disturbances and invariance during the sliding regime. The plant, on the other hand, is a nonlinear one with state variables are tightly coupled. The simulations have...
In this paper, an Adaptive Backstepping Neural Network control approach is used for a class of affine nonlinear systems which describe the Mitogen Activated Protein Kinase (MAPK) cascade models in the strict feedback form. We consider some of forms of the MAPK cascade [4]. The close loop signals are semiglobally uniformly ultimately bounded and the output of the system is proven to follow a desired...
In this paper the development of a low cost robotic vehicle for research and education is presented. The vehicle was designed considering minimum cost and maximum capabilities. As a base for testing devices and different type of sensors, a commercially available vehicle was used and modified. Two different version of the prototype vehicle were developed accompanied by the proper software that allows...
We demonstrate, using Monte-Carlo simulations, the robust performance of the adaptive control methodology denoted by RMMAC/XI introduced and discussed (Fekri and Athans, 2006 and 2005). The RMMAC/XI architecture can handle simultaneous time-variations in the plant uncertain parameters as well as the disturbance intensity statistics. We compare the RMMAC/XI performance vs that of the best possible...
In this paper, we look into performance analysis of bit-rate-limited stochastic control systems with quantized state feedback. We propose a new quantization scheme, and a new functional as a design tool, for computing an a priori bound on the mean square state.
Geneticists try to find the hidden truth behind the genomes which contain the blueprint for all parts of life’s machinery. Next challenge will be corresponding DNA to various types of proteins; thus deriving meaningful knowledge for the understanding of biological systems. Proteins are capable of explaining human evolution while others, such as membrane proteins, can reveal the developing mechanisms...
An input-output linearizing control for the fifth order induction motor described in the fixed stator frame, along with a simple scheme for rotor resistance and load torque identification is presented in the paper. The rotor resistance and load torque identification algorithm is designed based on steady-state rotor speed and stator currents information, assuming that through the identification phase...
A comprehensive step-by-step approach to the construction of a global fuzzy TSK model for a real SISO nonlinear system in closed loop is proposed. First the overall existing nonlinear distortions are evaluated, and then sub optimal experiments are designed so that the impacts of distortion are minimized. Such experiments can result in models which are consistent local estimations of the true underlying...
The problem addressed in this paper concerns the stability of decentralized resonant controller (DRC) for the disturbance rejection of a harmonic vibration disturbance. A resonant controller is presented within the formalism of the complex envelope. It is shown that the problem of stability only concerns the frequency responses at the disturbance frequency: a necessary condition of stability is to...
In this paper, we present a new method for designing stable fuzzy controllers for discrete event systems which are modeled by max-plus algebra. The fuzzy controller has three types of inputs; such as number of elements in buffer, delay of each part types, and throughput of each machines and the output of the fuzzy system is the earliest time that the pat types are available. It is assumed that the...
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