Signal pattern matching and automated algorithms for the loose parts monitoring system of the nuclear power plant원자력발전소 금속파편감시계통 신호의 패턴매칭과 자동화 알고리듬에 관한 연구

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Monitoring signals in the control room of nuclear power plants come in through multiple channels and are displayed as graphs on the display devices. It is crucial to make correct and reliable decisions on the relationships among the displayed graphs, which are representations of signals from different channels, both by implemented algorithms and human decisions. Simplified schemes to compare signal envelopes using cross correlation and cross entropy are introduced. In this work, algorithms to curve-fit the signal envelope to a polynomial and envelope generation with interval means are also researched. When generating signal envelopes, using interval means instead of interval medians is safe enough and is not seriously influenced by possible outliers. An effective use of eigenvalues for verification of the signal correlation is pursued in this work for a three channel case. Monitoring signals of the nuclear power plants are compared across the channels, or auto-correlation between recurring signals is analyzed to determine the signal closeness or to screen out false signals. Cross correlation of interval means from the bulk data is a better method than comparing the bulk data sets themselves. This is due to the smoothing effect of the signals when interval means are taken in place of the bulk data. A mathematical justification for the smoothing effect is tried using a newly defined smoothing function. The smoothing function shows a behavior that is similar to wavelet functions. The relative errors are also examined with an example from a reference. The Loose Parts Monitoring System(LPMS) monitors the probable damages by traveling loose parts to the internal structures of the nuclear power plant. It involves a lengthy and complicated process to determine the parameters like size, mass, speed, or impact location of the loose part when the signals are collected and processed. In this work, a simple and efficient model for determining the impact location of the loos...
Advisors
Seong, Poong-Hyunresearcher성풍현researcher
Description
한국과학기술원 : 원자력및양자공학과,
Publisher
한국과학기술원
Issue Date
2003
Identifier
181062/325007 / 000965344
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 원자력및양자공학과, 2003.2, [ vii, 79 p. ]

Keywords

Impact Mass; Impact Velocity; Loose Parts Monitoring; Nuclear Power Plant; Signal Pattern Matching; 신호패턴매칭; 충격질량; 충격속도; 금속파편감시계통; 원자력발전소

URI
http://hdl.handle.net/10203/48943
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=181062&flag=dissertation
Appears in Collection
NE-Theses_Ph.D.(박사논문)
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