Determination of the impact indicators of electromagnetic interferences on computer information systems
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ORIGINAL ARTICLE
Determination of the impact indicators of electromagnetic interferences on computer information systems Jacek Pas´ • Stanisław Duer
Received: 30 April 2012 / Accepted: 7 September 2012 Springer-Verlag London Limited 2012
Abstract The present article covers an influence of the impact of electromagnetic interferences on computer information systems whose purpose is to control transport supervision systems. The primary objective of transport supervision systems is to detect hazards to human life and health that occur in the process of transport: traveling of people and/or cargos. This process needs to be characterized by a high level of reliability and safety. The measure of the transport safety is the confidence that the elements of a transport process will remain intact during its realization with the exception of those changes that are the result of the natural processes of aging and wear. The railway environment is one of the most difficult environments concerning the provision of electromagnetic compatibility. Those electromagnetic interferences that are intended and not intended being generated in a rail area have an impact on the operation process of a transport supervision system. Keywords Electrical engineering Designing system Safe system Intelligent system Servicing process System modeling Expert system Computer sciences Knowledge base Diagnostics information
J. Pas´ Faculty of Electronic, Military University of Technology Warsaw, 2 Kaliskiego St., 00-950 Warsaw, Poland e-mail: [email protected] S. Duer (&) Department of Mechanics, Technical University of Koszalin, 15-17 Raclawicka St., 75-620 Koszalin, Poland e-mail: [email protected]
1 Introduction The natural electromagnetic field of Earth is distorted by those radiation sources that are intentionally generated (e.g. radio or TV transmitting stations) and that are generated unintentionally (e.g. by electromagnetic power lines and railway tractions). The rail electromagnetic environment is additionally distorted by movable sources of interferences: rail traction vehicles and electric locomotives. While starting, traction vehicles and electric locomotives draw from the rail traction electricity of a very high value: of several kA. Those electromagnetic interferences that occur over a vast rail area are the cause of the occurrence of false alarms in transport supervision systems, whose objective is to detect hazards in the transport process (e.g. a fire signaling system). The problem of the influence of electromagnetic interferences in the ELF frequency range of (0–2 kHz) and the VLF frequency range of (2–100 kHz) on the operation process of supervision systems is not addressed in the world literature. What is discussed is only issues related to the influence of this field on human health (investigations by WHO) and ways to limit the impact on electronic elements, devices and systems (shielding). The main purpose of transport systems is to transport people and cargos. Transport safety constitutes a propert
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