Structural health monitoring using cumulative harmonic analysis

用累积谱函数代替Berman和Fincham累积谱分析中的逐步时间窗函数，提出了一种新的结构健康监测方法。CHA无需瞬时振动记录即可估计和可视化系统的减振条件。阻尼条件与结构共振引起的主要谱峰附近的谱分布密切相关。即使在随机振动样本的短间隔内，这种类型的频谱分布也可以用CHA可视化。本研究的作者在以前的一项研究中报道了CHA在监测减震条件方面的作用。在这项研究中，作者通过缩尺模型试验证实了CHA在结构状态监测中的有效性。

This study 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 with respect to the damping conditions was reported by the present authors in a previous study. In this study, the authors confirmed the usefulness of CHA for structural condition monitoring by conducting scale model experiments.