• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2017, Vol. 53 ›› Issue (18): 176-182.doi: 10.3901/JME.2017.18.176

• 交叉与前沿 • 上一篇    下一篇

基于变保真度模型的AUV流体动力参数预测

宋保维, 王新晶, 王鹏   

  1. 西北工业大学航海学院 西安 710072
  • 收稿日期:2016-09-08 修回日期:2017-05-20 出版日期:2017-09-20 发布日期:2017-09-20
  • 通讯作者: 王鹏(通信作者),男,1978年出生,博士,教授.主要研究方向为水下航行器总体设计、多学科设计优化、高精度外形设计、减阻降噪等.E-mail:wangpeng305@nwpu.edu.cn
  • 作者简介:宋保维,男,1963年出生,博士,教授,博士研究生导师.主要研究方向为水下航行器总体设计、多学科设计优化、减阻降噪、可靠性等.E-mail:hanghai@nwpu.edu.cn;王新晶,男,1990年出生,博士研究生.主要研究方向为代理优化算法、水下航行器设计优化.E-mail:bj0213@mail.nwpu.edu.cn
  • 基金资助:
    国家自然科学基金资助项目(51375389)。

Predictions of AUV's Hydrodynamic Parameters Based on Variable-fidelity Modeling

SONG Baowei, WANG Xinjing, WANG Peng   

  1. College of Marine Science and Technology, Northwestern Polytechnical University, Xi'an 710072
  • Received:2016-09-08 Revised:2017-05-20 Online:2017-09-20 Published:2017-09-20

摘要: 变保真度模型(Variable-fidelity modeling,VFM)作为一种有效的代理模型方法被广泛用于工程设计,其中低保真度模型(Low-fidelity modeling,LF)用于获取目标模型的整体趋势,高保真度模型(High-fidelity modeling,HF)用于校正低保真度模型的准确度,二者通过桥函数(Bridge function,BF)融合,完成对目标模型的近似。将VFM用于预测自主水下航行器(Autonomous underwater vehicle,AUV)在外界工况(速度和攻角)下的流体动力参数(阻力系数、升力系数、力矩系数),其中高低保真度模型使用径向基函数构建,桥函数使用克里金函数构建,从遗传算法交叉算子产生的候选样本集中选择变保真度模型与高保真度模型误差最大的样本进行更新,最后建立变保真度代理模型。结果显示VFM能够准确描述流体动力参数在设计空间的变化;在相同的计算条件和时间下,VFM比高保真度模型精度高;随着高保真度样本的增加,模型的精度稳步提升。

关键词: AUV流体动力参数, 变保真度模型, 代理模型, 桥函数

Abstract: Variable fidelity modeling (VFM) which is regarded as an effective surrogate model is widely used in engineering design. In VFM, low-fidelity modeling's (LF) role is to capture the trend of objectives while the high-fidelity modeling's (HF) role is to revise the accuracy of LF. LF and HF are fused through bridge function (BF) and then finish the approximation for true model. This paper adopts VFM to predict autonomous underwater vehicle's (AUV) hydrodynamic parameters (drag, lift and torque coefficients) on certain velocity and angle of attack, in which LF, HF are built using RBF and BF is built using Kriging. Crossover operator of genetic algorithm produces candidate sample set and the sample with maximum error between VFM and HF will be chosen as newly added sample. Finally, VFM is established with all samples. The results show that compared to HF, VFM can describe precisely the change of hydrodynamic parameters in design space. Under same computing condition and time, VFM can gain better precision than HF and with the increases of HF samples in VFM, the accuracy of VFM becomes higher.

Key words: bridge function, hydrodynamic parameters of AUV, surrogate model, variable-fidelity modeling