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Advances in Acoustics and Vibration
Volume 2012, Article ID 327135, 6 pages
http://dx.doi.org/10.1155/2012/327135
Research Article

Modal Experiment on Structural Condition Monitoring Using Cumulative Harmonic Analysis

1Tokyo Metropolitan College of Industrial Technology, 8-17-1 Minami Senju, Arakawa-ku, Tokyo 116-0003, Japan
2Graduate School of Fundamental Science and Engineering, Waseda University, 3-4-1 Okubo Shinjyuku-ku, Tokyo 1698555, Japan

Received 3 July 2011; Accepted 23 November 2011

Academic Editor: Luc Gaudiller

Copyright © 2012 Yoshinori Takahashi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper describes a cumulative harmonic analysis (CHA) that replaces the stepwise time window function of Berman and Fincham's cumulative spectral analysis with a spectral accumulation function, thereby enabling a new structural health monitoring method. CHA estimates and visualizes system damping conditions without the need of transient-vibration records. The damping conditions are closely related to the spectral distribution around the dominant spectral peaks due to structural resonance. This type of spectral distribution can be visualized with CHA even within a short interval of random vibration samples. The effect of CHA on monitoring the damping conditions was reported by the authors in a previous study. In the current study, the authors confirmed the usefulness of CHA for structural condition monitoring by conducting scale-model experiments.