Extended partial and multiple coherence analyses and their application to reactor noise investigation.

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概要

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• Method of partial and multiple coherence analyses was studied in an attempt to develop an effective method for multivariable noise analysis at power reactors.<BR>The conventional method of coherence analyses was reviewed by following its mathematical formulation, which revealed rather strict limitations in its applicability to practical problems if there exist feedback loops among measured variables.<BR>In order to obviate the limitations inherent in the conventional method, this paper proposed a new method of extended partial and multiple coherence analyses on the basis of a multivariable autoregressive modeling, which permits, even for systems with feedback, the correct evaluation of the partial and multiple coherence for variables of concern.<BR>Both the conventional and the newly introduced coherence analysis methods were applied to simulation data as well as to JPDR-II (Japan Power Demonstration Reactor-II) noise data. The results of the analysis suggested that the extended partial and multiple coherence analyses can be an effective tool for investigation of at-power reactor noise where various feedback effects are thought to be significant.

• 一般社団法人 日本原子力学会の論文

著者

• OGUMA Ritsuo

  Division of Reactor Engineering, Tokai Research Establishment, Japan Atomic Energy Research Institute

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• Extended partial and multiple coherence analyses and their application to reactor noise investigation.

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