载荷谱外推方法的对比

Contrast of extrapolations in compiling load spectrum

载荷谱的外推是载荷谱编制过程中的关键,外推的准确度直接影响零/部件疲劳寿命的预测精度。通过综述参数法外推、雨流矩阵外推、时域外推和按里程分位点外推四种载荷谱外推方法,分析每种方法的应用条件及在实际外推过程中的关键环节,指出每种方法在应用中的优缺点,对载荷谱外推方法的使用提供参考。

Load extrapolation is a key component in the process of compiling load spectrum. The accuracy of extrapolation is decisive importance and a dominant element for the accuracy of fatigue life prediction. Presents four extrapolation methods consisting of parametric method, rain-flow matrix extrapolation, time-domain extrapolation, duration and percentile extrapolation, analyzes application conditions and key segment in actual process of each method respectively, and also indicates their advantages and disadvantages by analyzing the process of each method in application. According to the compared results ,the appropriate load spectrum extrapolation method could be chosen.