用概率推断法确定多工况二维疲劳设计谱的载荷最大值  

Maximal Loading Calculation for Two Dimensional Fatigue Design Spectrum under Multiple Working Conditions with Probability Extrapolation Method

作　　者：易当祥[1] 吕国志[1] 周雄伟[2] 

机构地区：[1]西北工业大学 [2]76321部队

出　　处：《应用力学学报》2006年第3期484-487,517,共4页Chinese Journal of Applied Mechanics

摘　　要：对各工况下的二维疲劳载荷,采用权系数的方法,合成并获得了多工况下的二维载荷联合概率密度函数。并由超越概率10-6对载荷进行外推,研究了确定多工况下二维疲劳设计谱中载荷最大值的概率推断——最速下降法的计算方法和步骤。实例的分析与比较,说明该方法是合理的和准确的,并由载荷最大值的分级和计算,编制了多工况下的8×8的二维疲劳设计谱。Two dimensional fatigue loading under various working conditions is synthesized with weight coefficient method to obtain joint probability density function under multiple working conditions. To extend the fatigue loading,it is important to get the maximal loading by exceeding probability 10 -6 . The corresponding schemes are discussed to obtain the maximal loading for two dimensional fatigue design spectrum with probability extrapolation-steepest descent method,and 8×8 two dimensional fatigue design spectrum is established.

关 键 词：疲劳设计谱 概率推断 最速下降法 载荷最大值 多工况 

分 类 号：O346.2[理学—固体力学]