EPE Association: NORpie 1998 - Topic 05: INDUSTRY APPLICATIONS

NORpie 1998 - Topic 05: INDUSTRY APPLICATIONS
You are here: EPE Documents > 05 - EPE Supported Conference Proceedings > NORpie - Proceedings > NORpie 1998 > NORpie 1998 - Topic 05: INDUSTRY APPLICATIONS

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   APPLICATION OF FUZZY THINKING TO IMPROVE RELIABILITY PERFORMANCE OF A TELECOM POWER SYSTEM
By Teuvo Suntio; Petri Vallittu [View]
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Abstract: Reliability performance of a DC UPS system having redundant (n+I) rectifiers and battery back-up of several hours can be theoretically very high. The existence of common mode failures can, however, significantly reduce or even totally destroy the naturally high reliability performance. Remote controlling of output voltage, output overvoltage monitoring and shut down as well as improper configuring of output voltage levels are the most common causes of common mode failures. This paper describes the methodology to analyze the availability and reliability performance based on Markov chains. Methods and ways are introduced and drscussed by means of which the existence of common mode failures can be minimized. The methodology is based on the Ideas derived from fuzzy logic and labelled fuzzy thinking.

   The Electric Traction System Design for Fork Lift Trucks
By Zhaohui Zeng; Ewen Ritchie [View]
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Abstract: AC motor drive systems are now applied in electric fork lift trucks. Consideration of the electric traction system required power, rated torque, and speed is discussed in this paper. The electric traction system tends to be designed for a Banev Coneolle wide constant power operation range with lower energy consumption during acceleration. Restrictions imposed by the mechanical system design and motor design on this strategy are also studied.

   Power Supplies of Personal Computers as a Source of Radiated RF Disturbances
By Jyri Rajamäki; Sami Nuutinen [View]
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Abstract: This paper presents the results of radiated emission tests performed on personal computers (PCs) and the associated power supplies. The primary aim of these tests was to investigate the possibility to demonstrate the compliance of the electromagnetic compatibility (EMC) requirements of a PC using the modular concept, in other words, if the equation CE+CE=CE is true at a product level. This study proves that configuring a PC from compliant sub units and components will not automatically mean that the PC complies. The power supply is the source of radiated interference only in the low frequencies (below 200 MHz) and the highest notable interference frequency is the half waveleth resonance frequency of the power cable.

NORpie 1998 - Topic 05: INDUSTRY APPLICATIONS
You are here: EPE Documents > 05 - EPE Supported Conference Proceedings > NORpie - Proceedings > NORpie 1998 > NORpie 1998 - Topic 05: INDUSTRY APPLICATIONS
	[return to parent folder]

	APPLICATION OF FUZZY THINKING TO IMPROVE RELIABILITY PERFORMANCE OF A TELECOM POWER SYSTEM By Teuvo Suntio; Petri Vallittu	[View] [Download]
Abstract: Reliability performance of a DC UPS system having redundant (n+I) rectifiers and battery back-up of several hours can be theoretically very high. The existence of common mode failures can, however, significantly reduce or even totally destroy the naturally high reliability performance. Remote controlling of output voltage, output overvoltage monitoring and shut down as well as improper configuring of output voltage levels are the most common causes of common mode failures. This paper describes the methodology to analyze the availability and reliability performance based on Markov chains. Methods and ways are introduced and drscussed by means of which the existence of common mode failures can be minimized. The methodology is based on the Ideas derived from fuzzy logic and labelled fuzzy thinking.

	The Electric Traction System Design for Fork Lift Trucks By Zhaohui Zeng; Ewen Ritchie	[View] [Download]
Abstract: AC motor drive systems are now applied in electric fork lift trucks. Consideration of the electric traction system required power, rated torque, and speed is discussed in this paper. The electric traction system tends to be designed for a Banev Coneolle wide constant power operation range with lower energy consumption during acceleration. Restrictions imposed by the mechanical system design and motor design on this strategy are also studied.

	Power Supplies of Personal Computers as a Source of Radiated RF Disturbances By Jyri Rajamäki; Sami Nuutinen	[View] [Download]
Abstract: This paper presents the results of radiated emission tests performed on personal computers (PCs) and the associated power supplies. The primary aim of these tests was to investigate the possibility to demonstrate the compliance of the electromagnetic compatibility (EMC) requirements of a PC using the modular concept, in other words, if the equation CE+CE=CE is true at a product level. This study proves that configuring a PC from compliant sub units and components will not automatically mean that the PC complies. The power supply is the source of radiated interference only in the low frequencies (below 200 MHz) and the highest notable interference frequency is the half waveleth resonance frequency of the power cable.