Diagnosis of Air-Gap Eccentricity Fault for Inverter Driven Induction Motor Drives in the Transient Condition
Modelling and Simulation Study of a Helicopter with an External Slung Load System
Comparative Study of Single Phase Power Inverters Based on Efficiency and Harmonic Analysis
Trichotomous Exploratory Data Analysis [Tri–EDA]: A Post Hoc Visual Statistical Cumulative Data Analysis Instrument Designed to Present the Outcomes of Trichotomous Investigative Models
LabVIEW Based Design and Analysis of Fuzzy Logic, Sliding Mode and PID Controllers for Level Control in Split Range Plant
This paper presents an application of Iterative Learning Control (ILC) to suppress the disturbances (uneven pavement, pot holes and cracks) in bus suspension system. In this paper, for the design of bus suspension system, a 1/4 bus model (one of the four wheels) is used to simplify the problem to a one dimensional mass-spring-damper system. The open loop behaviour of the system on the basis of time and frequency response is analyzed. The open loop characteristics of the bus suspension system are not satisfactory and require some control technique to improve system characteristics. Through the years, several control techniques have been studied to improve the performance of the bus suspension. The desired system should have short settling time and must have the ability to absorb all the bumping. To achieve these objectives, the present work describes the designing of Iterative Learning Control (ILC) for the bus suspension system. System performances for the desired parameters using ILC are investigated and analysed. Iterative learning control is applied to bus suspension to investigate the performance in terms of disturbance rejection and results are compared with a Proportional-Integral (PI) and Proportional-Integral-Derivative (PID) controller. The whole work of simulation and implementation of the ILC is done by using MATLAB/SIMULINK software.
Managing overhead transmission assets-including towers, conductors, insulators and other components are costly and sometimes a dangerous proposition. Many lines are located in remote, rugged environments. Frequently, inspection workers conduct helicopter surveys and also climb towers. Some equipments cannot be inspected due to hazardous conditions or access restrictions. Robotics inspection system being developed by the authors promises to reduce costs, enhance safety, and expand coverage while improving reliability. This robot provides a real-time monitoring of physical threats or damage to electrical transmission line towers and conductors as well as provide operational parameters to transmission line operators to optimize transmission line operation. These transmission lines are located at remote area where monitoring was not able to provided. To rectify this problem, this robot has been designed and aims at enhancing the transmission system by minimizing its drawbacks like insulation damage, ageing, electrical outages (due to high risk trees) and ground clearance which are faced manually. By using automated system, human involvement can be minimized. In the proposed robot system, we can overcome all these problems. The data collected in this system can be transmitted to control room by providing the receiver and transmitter in each pole upto the end point. The communication between end point and control room takes place using existing infrastructure like cell or landline, internet or any other communication infrastructure. If line to ground monitoring is required, we can transmit and receive the data directly
This paper discusses FPGA based digital controller designed for solar tracking in satellites. The proposed controller can replace the conventional full-step controller for stepper motor in all positioning applications owing to its increased resolution capability and reduced effect of mid-frequency resonance. The concept of microstepping is discussed using PWM. The design is implemented in Xilinx ISE. Results are presented to show the substantial advantages of the proposed methodology.
The potential for a solar-thermal system for hot water generation has been studied. Solar electric generation systems (PTSC) currently in operation are based on parabolic trough solar collectors using water as heat transfer fluid in the collector loop to transfer thermal energy. To improve performance and reduce costs direct steam generation in the collector has been proposed. In this paper the efficiency of parabolic trough collectors is compared on the basis of different reflecting surfaces (current SEGS plants). The model is based on absorber fluid temperature so it can be used to predict the performance of the collector with any working fluid. The effects of absorber emissivity and internal working fluid convection effects are evaluated. An efficiency equation for trough collectors is developed and used in a simulation model to evaluate the performance of direct steam generation collectors for different radiation conditions and different absorber tube sizes. The authors determined the performance of PTSC on the basis of different reflecting surfaces.
The objective of the paper is to design a more efficient model of a Vertical Axis Wind Turbine using advanced tools like Modelling, simulation and CFD analysis. It includes some advanced optimised design techniques. This concept is developed based on existing Savonius and Darrieus wind turbine models. To develop modified Savonius turbine and to analyze and compare its feasibility as an alternative method for harvesting wind energy at highest efficiency, in this paper, it is going to be replaced with a Savonius rotor blade with FIVE naca-0009 airfoils each side, which controls the motion of airfoils while the turbine rotor rotates. These Airfoils will be in closed condition when rotor is facing the direction of air stream and when the rotor blade comes in opposite direction to the wind, the three middle blades open by which the opposing Drag force will decrease inturn increasing the efficiency of VAWT.