Mahmood H Nagrial

DESIGN OPTIMIZATION OF MAGNETIC COUPLINGS USING HIGH ENERGY MAGNETS

ABSTRACT The paper presents a critical review of existing design methods for magnetic couplings. A parametric study is carried out to show the effects of various design dimensions on the performance of magnetic: couplings. The design of synchronous type couplings with Nd-Fe-B magnets is formulated as a nonlinear programming problem. An efficient and powerful numerical optimization routine is used to predict optimum design dimensions.

Network security approach for digital forensics analysis

Advances in Digital Technology have presented new challenges to both Industry and Law. Technology security experts are enhancing platforms security to protect enterprise and government from intrusions, whereas legal experts are adopting new techniques to investigate ldquoillegalrdquo breaches to systems and networks. This paper provides an overview of Digital Forensics methodologies, computer and network vulnerabilities and security measures, forensics tracking mechanisms to detect and deter intruders. A case study for tracing a Distributed DoS attack is also presented.

Design and performance of permanent magnet slotless machines

The paper presents various configurations of PM slotless machines. The design aspects to achieve optimum efficiency are also discussed. The paper also presents various configurations of slotless windings. The details of practical windings are also given. The extra eddy current loss and its reduction are also discussed. The comparative performance of two types of slotless windings is also presented.

Design and Development of Magnetic Torque Couplers and Magnetic Gears

New breed of permanent magnets are increasingly being used in novel permanent magnet electromechanical devices. This paper deals with the application of rare-earth magnets in the design of synchronous magnetic torque couplers and magnet gears. The performance of experimental devices is compared with finite element analysis.

Performance of magnetic couplings using Nd-Fe-B magnets

The experimental performance of coaxial couplings employing rare-earth magnets are given. The design has been optimised using numerical optimisation techniques. Four different designs with equal and unequal magnets are experimentally tested, to test the validity of optimum design. It is concluded that the performance of optimum design far exceeds any other configurations.

Analysis, design and performance of magnetic couplings

The paper presents a critical review of existing design methods for magnetic couplings. Based on the analysis and design optimisation, a prototype synchronous type coupling is built and tested. The experimental performance is compared with theoretical performance and the agreement is quite good.<<ETX>>

Project based engineering education: a case for teaching EMC/EMI

This paper advocates the need to introduce a course on EMC at undergraduate level. In addition, it discusses and outlines the essential contents of such a course, which can be taken by engineering students with very basic knowledge of electromagnetism. An EMC course is, also, beneficial for non-electrical major students such as mechatronics. The authors also discuss various issues and methodologies used during the introduction of a project based EMC unit at the University of Western Sydney.

Conversion of a switched reluctance motor to operate as a generator for wind power applications

Climate change effect become number one concern in many countries due to the effect that will have on human life. Renewable energy found to be one of the most effective ways to overcome this problem, wind energy is part of the renewable and one of the most growing areas in this field. In this paper the definition of switched reluctance generator and the principal of operation will be discussed, the excitation cycle and its relation to the switching parameters, methods on the switching phenomena will be discussed, low speed circuit and high speed circuit will be explained, output power of the SRM

Development of Planning Procedures with Embedded Solar Systems

Abstract In this paper, the impact of solar photovoltaic generators deep in a typical urban medium and low voltage distribution networks is examined. Using a concept of equivalent net loading, a novel yet simple method is proposed wherein an “effective” level of solar input, based on readily available sunshine data, can be estimated over the summer peak load period and incorporated into traditional planning procedures.

Fault current distribution and pole earth potential rise (EPR) under substation fault

Abstract New high-voltage (HV) substations are fed by transmission lines. The position of these lines necessitates earthing design to ensure safety compliance of the system. Conductive structures such as steel or concrete poles are widely used in HV transmission mains. The earth potential rise (EPR) generated by a fault at the substation could result in an unsafe condition. This article discusses EPR based on substation fault. The pole EPR assessment under substation fault is assessed with and without mutual impedance consideration. Split factor determination with and without the mutual impedance of the line is also discussed. Furthermore, a simplified formula to compute the pole grid current under substation fault is included. Also, it includes the introduction of the n factor which determines the number of poles that required earthing assessments under substation fault. A case study is shown.