基于SVM的含缺陷20钢弯管爆破压力预测

Prediction of burst pressure of 20 steel elbow with defects based on SVM

为快速、精确预测含局部减薄缺陷的弯管爆破压力,首先验证显式非线性有限元模型的模拟精确性,然后以168组不同缺陷尺寸下20钢弯管爆破压力的有限元模拟数据作为学习样本,建立含局部减薄缺陷20钢弯管爆破压力预测的支持向量机(SVM)模型;其次利用交叉验证(CV)、遗传算法(GA)、粒子群算法(PSO)分别优化SVM模型;最后分析对比用于预测弯管爆破压力的3种优化SVM模型与ASME B31G-2009、DNV RP-F101、SHELL 92等3种通用规范的计算误差。结果表明:CV-SVM、GA-SVM、PSO-SVM等3种模型的预测误差均小于3种规范的计算误差,其最大相对误差分别为-2.33%、-3.4%和1.94%;说明SVM模型用于预测弯管爆破压力时操作简单、计算时间短、预测精度高、工程实用性好。

In order to quickly and accurately predict the burst pressure of 20 steel elbow with local wall-thinning defects,the SVM model for predicting burst pressure was established.After verifying the simulation accuracy of the explicit nonlinear finite element method,the 168 sets of data of explicit finite element simulation for burst pressure of 20 steel elbows with different defect sizes were used as learning samples of SVM model.CV,GA and PSO were used to optimize the SVM model.The prediction errors were analyzed by comparing the burst pressure calculated by the three optimized SVM model and 3 types of common criterions(ASME B31G-2009,DNV RP-F101 and SHELL 92).The results show that the prediction errors of the three optimized SVM models are less than that of the current common criterions at home and abroad.When CV-SVM and GA-SVM and PSO-SVM models are used to predict the burst pressure of 20 steel elbows with local thinning defects,and the maximum errors of CV-SVM,GA-SVM and PSO-SVM are-2.33%,-3.4%and 1.94%respectively.SVM model is easy to use,has high prediction accuracy,good engineering practicability and short time consumption.