带有压型板的车下悬挂件随机振动疲劳寿命分析

Analysis on Random Vibration Fatigue Life of Under-Mount Suspension Parts with Profiled Plates

在铁道车辆车下悬挂箱体结构中,通常利用在箱体底板上增加压型格来增大底板的刚度,从而提高整体结构的固有频率。为了验证压型格对整个箱体底板固有频率提高的效果,利用有限元仿真及试验两种方法对压型板及不带压型格的平板进行模态分析,同时通过对比两种类型板的模态分析结果修正压型板有限元模型,保证了整个悬挂件箱体有限元模型建立的正确性。利用基于功率谱密度的频域分析方法对整个箱体进行随机振动疲劳寿命分析,当箱体底板分别为压型板和平板,对比两种情况下悬挂件箱体焊缝单元在IEC61373标准激励下的疲劳损伤,来验证压型板结构在工程中的实用性。

In the box structure of the railway vehicle suspension, it is common to increase the rigidity of the bottom plate by adding a pressing pattern on the bottom plate of the box body, thereby increasing the natural frequency of the overall structure. In order to verify the effect of pressure grid on increasing the natural frequency of the bottom plate of the box, modal analysis of the profiled and non-pressed panels was carried out by using the finite element simulation and test methods, and the two types of panels were compared. The modal analysis results modify the finite element model of the profiled plate to ensure the correctness of the finite element model of the entire suspension box structure. The frequency domain analysis method based on power spectral density is used to analyze the random vibration fatigue life of the whole box. When the bottom plate of the box is pressed plate and flat plate respectively, the welded parts of the hanging box are compared under the IEC61373 standard excitation to the two cases. The fatigue damage is used to verify the practicability of the profiled structure in engineering.