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 of modal analysis and modal test for the blade swing mechanism, multiple parameters optimization was brought into finite element model in response surface method. First, the overall modal parameters of the structure were extracted by modal analysis. Second, as to this large assembly, modal test was developed by moving sensor not hammer. The methods of validating test result and confirming main modes were mode assurance criterion and mode participation factor, respectively. Again, based on finite element model error analysis, the principle of this model updating was intended to be different parts with different materials. The sample space determined by central composite test design was calculated in regression analysis by use of multiple objective response surface method, in which the mode updating targets were optimized. Finally, using the modified parameters in a new modal analysis validated mode updating accuracy, while developing dynamic simulation compared with the actual test results. The results show that correlation of modal test and updated modal analysis were improved, the average frequency error of the first three modes was reduced from 9.71% to 0.73%, and modal shape MAC was improved from 0.74 to 0.89.
关键词
模型修正 /
响应面方法 /
模态试验 /
模态分析 /
叶栅摆动装置
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Key words
model updating /
response surface method /
modal test /
modal analysis /
blade swing mechanism
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参考文献
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