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Design of a novel block-backstepping based nonlinear stabilizing control law of a pendubot is presented in this paper. It is a 2-DOF underactuated with unactuated shape variable and second order nonholonomic constraint. At the onset of the design, state model of the pendubot has been transformed into the block-strict feedback form. Thereafter, a systematic approach has been utilized to devise a backstepping...
Brushless DC motors (BLDCM) are most popular because of their higher efficiency, less maintenance and precise control characteristics. However, this motor has nonlinear nature and can be affected easily by the parameter change and disruption. For any automobile and industrial applications, it is essential to govern the speed accurately. Because of their fixed gain values, high peak overshoot and high...
Multiphase founds several applications in different industries. Due to complex flow structure, characterization of multiphase flow is different from that of single phase flow. In the present communication, parametric study of air water two phase flow in a 50mm vertical conduit has been performed through rigorous image processing. Only bubbly flow has been considered for the present study. Variation...
The paper properly plays on the power density and thermal limits of the flyback converter (SMPS) in terms of the power quality, tight line regulations, efficiency, robust reliability, compactness, wider range of load variations, dc to dc power point conversions and the generic performance. The high switching frequency operation not only decreases the overall dimension, weight and heat sink size but...
An attempt has been made in this article for effective solution of load frequency control (LFC) problem in an interconnected power system using a meta-heuristic optimization technique, called oppositional krill herd algorithm (OKHA). Krill herd algorithm (KHA) is simply mimics the life cycle of krill in an oceans and designed based on the solution of herding behavior of individual krill. A two-area...
The nonlinear nature of the system behavior causes several disturbances due to which the stability of the system gets affected. Controlled operation of power systems is very critical and most important factoris to achieve stable power system. For this reason there is a need of an adaptive control technique. PID controllers are widely used due to their simplicity and ease of re-tuning on-line. Several...
In this ongoing work, three non-linear Gaussian filters viz. the unscented Kalman filter (UKF), the cubature qudrature Kalman filter (CQKF) and the Gauss-Hermite filter (GHF) are designed to track blood glucose and insulin concentrations, as well as interstitial insulin level with the help of the ‘Bergman's minimal model of glucose-insulin homeostasis’. All the filters successfully track the plasma...
Electrocardiogram (ECG) compression for patient monitoring is a pre-requisite for efficient utilization of the communication link. Few recent works using delta encoding adopted fixed length symbols were analyzed, and we found that their bits per sample efficiency (BPS) is low, specially in low slope regions of ECG wave. For real-time tele-monitoring, this may lower the link throughput. This paper...
Economic Load Dispatch (ELD) is one of the important optimization problem in advanced power system and control. In this paper, six and fifteen generating units in ELD problem has been considered. Prohibited zone and ramp rate limit constraints has been also considered. ELD problem has been solved using three types of optimization techniques. These optimization techniques are Particle Swarm Optimization...
With increasing number of on-road transportation vehicles, the demand for passenger safety and comfort is inevitable. This inspired to develop technologically sophisticated automobiles with active safety systems that provide improved vehicle handling during critical driving situations. Yaw stability controller prevents the vehicle from spinning and drifting-out under loss of traction during a turning...
In this paper, a control scheme for tracking maximum power point for a solar photovoltaic (PV) panel feeding power to the three phase grid through an intermediate boost converter followed by a grid-tie PWM inverter stage is presented. The intermediate DC to DC boost converter small signal model is derived considering the fact that its output behaves as a constant DC voltage power sink. The selection...
The paper presents a scheme for the rotor side field oriented control of doubly fed induction generator (DFIG) connected to the power grid. To control the speed, the slip power is exchanged between the grid and the generator through a Matrix Converter connected to the rotor side as power frequency changer. Use of Matrix Converter (MC) helps to increase the input power factor of the overall DFIG system...
In recent years, installation of renewable energy facilities is increasing rapidly in response to the movement to suppress the release of greenhouse gasses responsible for the warming of the earth and to save fossil fuels, which are growing increasingly precious. Furthermore, the cost of photovoltaic systems is decreasing year by year. Therefore, it is assumed that price of photovoltaic power will...
One of the major factors which degrades the Free Space Optics (FSO) link performance is the atmospheric turbulence. Turbulence manifests in increased Bit Error Rate (BER) leading to degradation in the link performance. Adaptive Coding and Modulation (ACM) technique is used to mitigate this effect. This technique is an adaptive transmission scheme wherein transmission parameters such as modulation...
A novel single layered fractal spiral capacitor has been designed using fractal geometry. The simulation results carried out by High Frequency Structural Simulator. The simulation results shows fractal spiral capacitor provides10.3% improvement in Capacitance, 52.4% improvement in Q factor and 20% improvement in self resonant frequency over standard spiral capacitor.
The Kalman filter has a wide range of applications, noise removal from corrupted speech being one of them. The filter performance is subject to the accurate tuning of its parameters, namely the process noise covariance, Q, and the measurement noise covariance, R. In this paper, the Kalman filter has been tuned to get a suitable value of Q by defining the robustness and sensitivity metrics, and then...
An electrical impedance model of a thin disc piezo based sensor, used for resonance frequency analysis, is proposed in this paper. The sensor consists of the piezo element attached to a metallic strip with some adhesive and so, the response of the sensor is dependent on the geometry and modes of vibration of both the piezo element and the metallic strip attached to it. The experimentally measured...
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