薄板应力功率谱密度仿真与实验验证

Simulation and Experimental Verification of Stress Power Spectral Density for Thin Plate

为避免出现因时域信号过长而无法加载的情况,可将时域信号转化为功率谱密度,在频域下研究振动载荷下的疲劳特性.采用传递函数方法对疲劳失效部位进行精准定位,进而获得该位置处的应力功率谱密度,并进行实验验证.研究表明,根据传递函数方法可以精确获得危险部位处的应力功率谱密度,为频域内疲劳寿命预测的研究提供理论基础和载荷数据支撑.

In order to avoid the situation that the time-domain signal is too long to be loaded,the timedomain signal would be transformed into the power spectral density and the fatigue characteristics under vibration loading was studied in the frequency domain.The transfer function method was used to accurately locate the fatigue failure site.The stress power spectral density of the location was obtained,and experimental verification was carried out.The research shows that the stress power spectral density at the dangerous place can be accurately obtained according to the transfer function method,which provides theoretical basis and load data support for the research on the prediction of fatigue life in the frequency domain.