Kordestani Hadi, Zhang Chunwei
Structural Vibration Group, Qingdao University of Technology, Qingdao 266033, China.
Sensors (Basel). 2020 Apr 2;20(7):1983. doi: 10.3390/s20071983.
The Savitzky-Golay filter (SGF) is a time-domain technique that determines a trend line for a signal. The direct application of SGF for damage localization and quantification is investigated in this paper. Therefore, a single-stage trend line-based damage detection method employing SGF is proposed in which the damage is located and quantified at the bridge under moving load. A simply supported beam under moving sprung mass is numerically simulated to verify the proposed method. Four different velocities and five different single- and multi-damage scenarios are considered. The acceleration data along the beam are obtained, manually polluted with noise and their trend lines are then determined using SGF. The results show that the proposed method can accurately locate and quantify the damage using these trend lines. It is proved that the proposed method is insensitive to the noise and velocity variation in which having a constant velocity is a hard task before and after damage. Additionally, defining a normalization factor and fitting a Gaussian curve to this factor provide an estimation for the baseline and therefore, it categorizes the proposed method as baseline-free method.
萨维茨基-戈莱滤波器（SGF）是一种确定信号趋势线的时域技术。本文研究了SGF在损伤定位和量化方面的直接应用。因此，提出了一种基于单阶段趋势线的损伤检测方法，该方法采用SGF，在移动荷载作用下对桥梁的损伤进行定位和量化。对移动簧载质量作用下的简支梁进行了数值模拟，以验证所提出的方法。考虑了四种不同的速度以及五种不同的单损伤和多损伤情况。获取沿梁的加速度数据，人工添加噪声，然后使用SGF确定其趋势线。结果表明，所提出的方法可以利用这些趋势线准确地定位和量化损伤。证明了所提出的方法对噪声和速度变化不敏感，而在损伤前后保持恒定速度是一项艰巨的任务。此外，定义一个归一化因子并对该因子拟合高斯曲线可提供基线估计，因此，该方法可归类为无基线方法。
