组合近似模型在小水线面双体船应力预测中的应用

Prediction of stress of small waterplane area twin hull by adopting ensemble of metamodels

小水线面双体船受海浪冲击时结构应力的准确预测对保证航行安全具有重要意义。采用有限元软件进行应力的数值仿真需要花费巨大的时间成本,构建近似模型成为解决这一问题的有效途径。由于样本点有限,当选择不适当的近似模型时难以保证近似模型精度,组合近似模型(EMs)技术能避免选择单一近似模型的不足和缺陷。本文采用组合近似建模技术预测小水线面双体船在受海浪冲击时的最大结构应力,并与单一近似模型预测精度进行比较,结果表明,组合近似模型的精度更高,能够有效预测最大结构应力,具有较大的工程实用价值。

Predicting the structural stress of small waterplane area twin hull（SWATH） is of great significance to ensure the safety of navigation when the ship is impacted by the waves. The numerical calculation of stress by finite element software can be very time-consuming. Building the metamodel becomes an effective way to solve this problem. Because of the limitation of sample size, a improper metamodel may cause low metamodel accuracy. Ensemble of metamodels（EMs）can avoid the disadvantage of single metamodel. EMs is applied to predict the the structural stress of SWATH and compared with single-fidelity metamodel for metamodel accuracy. The results indicate that the EMs can ensure the metamodel accuracy.