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Switched reluctance machine drive requires knowledge of flux linkage characteristics and its partial derivatives for high performance controller design and implementation. A mathematical model, which accurately describes the flux linkage characteristics as well as easily provides its partial derivatives, is proposed in this paper. The proposed model, even though accurate, has fewer parameters than...
This paper presents a comparison between the Proportional-Derivative (PD)-Fuzzy and Proportional-IntegralDerivative (PID) for balancing control of an extendable doublelink of two-wheeled mobile robot (TWMR). The two controllers were implemented to the first link of the TWMR for performance comparison between the intelligent and conventional controller while maintaining similar control strategies for...
Electric Power Assist Steering (EPAS) system offers a significant potential in enhancing the driving performance of a vehicle where the energy conserving issue is important. In this paper, Ant Colony Optimization (ACO) algorithm is implemented as tuning mechanism for PID controller. The aim of this hybrid controller is to minimize energy consumption of the EPAS system in Electric Vehicle (EV) by minimizing...
A one-dimensional simulation of an electrofusion welding process based on finite difference method using control volume discretization is presented. Usually simulations of this nature are implemented with finite elements using a package, such as ABAQUS, with time consuming iterative computer code. This simulation is able to predict temperature and stress histories as well as giving the gap closure...
This paper presents a mechanism for wheelchair transformation from two-wheeled upright position to four-wheeled position using a modular fuzzy logic control (MFC) approach. A wheelchair model that can be operated in four-wheeled and two-wheeled modes has been developed within the Visual Nastran environment and integrated with Simulink for control purposes. A multi-input multi-output modular fuzzy...
One of the key challenges for high density servers is power consumption. High energy consumption causes excessive heat generation which increases system failure and consequently cooling costs. This paper presents a theoretical and experimental framework to control the peak power consumption of servers at the cluster level. We propose an enclosure-level controller that allocates power among servers...
Genetic algorithm (GA) applied to feature selection and model optimization improved the performance of robust mathematical models such as Bayesian-regularized neural networks (BRANNs) and support vector machines (SVMs) on different drug design datasets. The selection of optimum input variables and the adjustment of network weights and biases to optimum values to yield generalizable predictors were...
A dynamic compartmental model based on first principles is developed for a tubular solid oxide fuel cell system. The model accounts for diffusion processes, inherent impedance, transport (heat and mass transfer) processes, electrochemical processes, anode and cathode activation polarizations, and internal reforming/shifting reactions, among others. Dynamic outlet voltage, current and fuel-cell-tube...
In this paper, a virtual wheelchair (WC) model is developed within Visual Nastran (VN) software environment where the model is further linked with Matlab/Simulink for control purposes. The goal is to have stable two-wheeled WC by transforming the two front wheels (caster) to the upright position. Theoretically, when the two big wheels are fed by the same torque, the WC system will only move in one...
This paper deals with the attitude control of small satellites using commercial off the shelf (COTS) components in order to keep the overall cost within financial constraints. The design involves the use of gyroscopes and digital sun sensors (DSS) for attitude determination while three reaction wheels have been employed as actuators. Two different control schemes, proportional & derivative (PD)...
This paper described the Low Technology Co-fired Ceramic (LTCC) design methodology at TMRND based on FDTD EM simulations that are required when designing the RF/microwave circuit. In this paper, 3D EM analysis and optimization with Finite Different Time Domain (FDTD) software Empire XcCeltrade from IMST was applied to achieve accurate modeling of the RF/microwave circuit using LTCC technology. A multilayer...
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