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桥梁结构健康监测直观检查法具有一定的局限性。新的基于希尔伯特—黄变换(HHT)的非破坏性桥梁结构健康监测方法,依赖于瞬变荷载测试和简便的数据收集,核心是近年来针对非稳态和非线性时间序列分析而新发展起来的HHT,由经验模态分解和Hilbert谱分析构成。该方法对桥梁结构健康性的最终判断依据是基于数据的非线性特征、自由振动和强迫振动的频率对比、桥梁对轻荷载及重荷载的响应。该方法的优点是:无需以前的数据,简便的数据采集,最少程度地干扰交通,以及细微差别的精确定量解释。工程实例的分析结果表明这种新方法应用于铁路桥梁结构健康监测的可行性。
Bridge structure health monitoring visual inspection method has its own limitations. The new method based on Hilbert-Huang Transform (HHT) for non-destructive bridge structural health monitoring relies on transient load testing and easy data collection. The core of this new method is the non-stationary and nonlinear time series analysis in recent years The newly developed HHT consists of empirical mode decomposition and Hilbert spectral analysis. The final criterion for the structural health of the bridge is based on the nonlinear characteristics of the data, frequency contrast of free vibration and forced vibration, and the response of bridges to light and heavy loads. The advantages of this approach are: No previous data, easy data acquisition, minimal disruption to traffic, and nuanced exact quantitative interpretation. The analysis of engineering examples shows that this new method is applicable to the health monitoring of railway bridges.