Structural dynamics relates the excitation profile to the dynamic loads at a particular location of the structure. Spectral methods fatigue-life estimation is based on the assumptions of stationarity and the Gaussianity. This research proposes a method for a fatigue-life estimation for non-stationary excitation. The method is based on the short-time spectral narrowband method, where the short-time width was found to be related to the structural dynamics (i.e., natural frequency, damping) of the excited structure. A detailed numerical and a real experiment shows a significant accuracy increase for fatigue-life estimation at non-stationary and non-Gaussian excitation.

中文翻译：

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考虑结构动力学的非平稳过程的短时疲劳寿命估算

结构动力学将激励曲线与结构特定位置的动态载荷相关联。光谱方法的疲劳寿命估算基于平稳性和高斯性的假设。这项研究提出了一种用于非平稳激励的疲劳寿命估计的方法。该方法基于短时光谱窄带方法，其中发现短时宽度与受激结构的结构动力学（即固有频率，阻尼）有关。详细的数值和实际实验表明，在非平稳和非高斯激励下的疲劳寿命估算的精度显着提高。