基于响应面方法的叶栅摆动装置有限元模型修正

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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.

Key words： model updating response surface method modal test modal analysis blade swing mechanism

Received: 25 May 2015 Published: 15 November 2016

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2016/V35/I22/232

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