时间序列载荷法的桁架式车架疲劳分析
Fatigue Analysis of Vehicle Truss Frame based on Time Series Load Method

桁架式车架因具有刚度大、质量小等优点，已在高性能车辆上得到广泛使用。为确保车辆安全性和耐久性，对其进行疲劳分析、预测疲劳危险点具有重要意义。根据该类车辆的特性，规划了测试路线，并通过加速度传感器获得加速度载荷谱；分析了车架系统特性和载荷变化频率，确定采用时间序列载荷法；使用雨流计数法对载荷谱进行计数，并对比分析了几种常用的平均应力修正理论；对车架进行疲劳分析，获得车架预测寿命与疲劳危险点的位置。
The truss frame is widely used in high-performance vehicles because it has the advantages of large rigidity and light weight. It is important for safety and durability of vehicles to analyze the fatigue damage and fatigue risk points of the frame. Firstly, the test route was planned according to the vehicle characteristics. The acceleration load spectrum was obtained through the acceleration sensor. Secondly, spectrum analysis was used for the characteristics of the frame and frequency of load change. The time series fatigue calculation method was chosen. Thirdly, the rain-flow counting method was used to count the load spectrum. Several commonly mean stress amending theories were analyzed and compared. Lastly, the fatigue analysis of the frame was carried out. The predicted life of the frame and the location of the fatigue risk point were known