【摘要】 建立了基于RS与RBF神经网络集成的钛合金焊接接头疲劳寿命预测模型(RS_RBFNN),该模型首先基于熵的连续属性离散化算法离散化疲劳数据并应用遗传算法约简疲劳寿命评价指标;基于最小约简指标提取焊接结构疲劳寿命分类判别规则以及对RBF神经网络进行训练;最后使用粗糙集理论判别与规则库匹配的检验样本疲劳寿命等级,使用RBF神经网络判别不与规则库任何规则匹配的检验样本疲劳寿命等级.基于钛合金疲劳试验数据的实证分析结果表明,RS_RBFNN模型容错性较好、精度较高,对钛合金焊接结构疲劳寿命预测具有一定的实际指导意义.更多还原

【Abstract】 An integrated model of rough set and neural network( RS_RBFNN) was proposed for predicting fatigue life of titanium alloy welded joints. The fatigue data were discretized by using the entropy-based algorithm,and the fatigue evaluation indices were reduced without information loss through a genetic algorithm. The reduced indices were used to develop the rules for fatigue life of welded joints and to train the RBF neural network.The rough set theory was used to determine the category of fatigue life for the test samples which matched the rules in the rulebase. The neural network was applied to those test samples which did not match any rules in the rule-base. Experimental results based on the fatigue data of titanium alloy show that the RS_RBFNN model for fatigue analysis of welded joints had improved fault tolerance and precision. Therefore this model is of practical significance for predicting fatigue life of titanium alloy welded joints.更多还原