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Model updating using correlation analysis of strain frequency response function

机译:应变频率响应函数相关分析的模型更新

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摘要

A method is proposed to modify the structural parameters of a dynamic finite element (FE) model by using the correlation analysis for strain frequency response function (SFRF). Sensitivity analysis of correlation coefficients is used to establish the linear algebraic equations for model updating. In order to improve the accuracy of updated model, the regularization technique is used to solve the ill-posed problem in model updating procedure. Finally, a numerical study and a model updating experiment are performed to verify the feasibility and robustness of the proposed method. The results show that the updated SFRFs and experimental SFRFs agree well, especially in resonance regions. Meanwhile, the proposed method has good robustness to noise ability and remains good feasibility even the number of measurement locations reduced significantly.
机译:提出了一种利用应变频率响应函数(SFRF)的相关分析来修改动态有限元(FE)模型的结构参数的方法。相关系数的敏感性分析用于建立线性代数方程,以进行模型更新。为了提高模型更新的准确性,采用正则化技术解决模型更新过程中的不适定问题。最后,进行了数值研究和模型更新实验,验证了该方法的可行性和鲁棒性。结果表明,更新后的SFRF和实验SFRF非常吻合,特别是在共振区域。同时,该方法具有良好的抗噪声能力,即使测量位置数量明显减少,仍具有良好的可行性。

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