基于响应面方法的叶栅摆动装置有限元模型修正

发布时间：2018-06-04 03:50

本文选题：模型修正 + 响应面方法　；参考：《振动与冲击》2016年22期

【摘要】：为提高叶栅摆动装置模态分析与模态试验的相关性,使用响应面方法对有限元模型多个参数进行优化,实现模型修正。首先使用有限元模型进行模态分析,提取整体模态;其次,采用移动传感器方法对大型装配体进行整体模态试验,通过模态判据准则检验模态试验结果、模态参与因子确定主要整体模态;再次,基于有限元模型误差分析,确定对主要部件分别采用不同材料修正参数,通过中心复合试验设计确定样本空间,使用多目标响应面方法对样本进行回归分析,在回归分析的响应面内对待修正参数进行非线性约束优化,得到最优解;最后,使用修正参数重新进行模态分析实现模型确认,并进行动力学计算,与实际测试结果对比。结果表明,修正后的模态分析与模态试验结果相关性提高,前三阶整体模态频率误差均值由9.71%减小至0.73%,振型相关性由0.74提升至0.89。
[Abstract]:In order to improve the correlation between modal analysis and modal test, response surface method is used to optimize several parameters of finite element model and to correct the model. First, the finite element model is used for modal analysis, and the whole modal is extracted. Secondly, the method of moving sensor is used to carry out the overall modal test on the large assembly, and the modal test results are verified by the modal criterion. Thirdly, based on the error analysis of finite element model, different materials are used to modify the parameters of the main components, and the sample space is determined by the central composite test design. Multiobjective response surface method is used for regression analysis of samples. Nonlinear constrained optimization of modified parameters is carried out in the response surface of regression analysis, and the optimal solution is obtained. Finally, modal analysis of modified parameters is used to realize model confirmation. The kinetic calculation was carried out, and the results were compared with the actual test results. The results show that the correlation between the modified modal analysis and the modal test results is improved. The mean value of the first three order overall modal frequency error is reduced from 9.71% to 0.73%, and the mode correlation is raised from 0.74 to 0.89.
【作者单位】：中国空气动力研究与发展中心;空气动力学国家重点实验室;
【基金】：军内科研计划项目
【分类号】：TH113.1

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