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Vibratory diagnosis by finite element model updating and operational modal analysis

机译:通过有限元模型更新和运行模态分析进行振动诊断

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摘要

In this paper, a subspace fitting method is proposed to update, in the time domain, the finite element model of a rotating machine. The procedure is achieved by minimizing an error norm, leading to the comparison between experimental and theoretical observability matrices. Experimental observability matrix is obtained through a MOESP subspace identification algorithm, by projecting the output signal onto some appropriate subspaces, resulting in a cancellation of input excitations and noises. The theoretical observability matrix is obtained from modal parameters of a finite element model of the structure. The minimization procedure is carried out through a Gauss-Newton algorithm. The method is applied to determine the foundation stiffness of an experimental rotating machine subject to a random noise.
机译:本文提出了一种子空间拟合方法,可以在时域上更新旋转机械的有限元模型。通过最小化误差范数来实现该过程,从而可以在实验和理论可观察性矩阵之间进行比较。通过将输出信号投影到一些适当的子空间上,通过MOESP子空间识别算法获得实验可观察性矩阵,从而消除了输入激励和噪声。从结构的有限元模型的模态参数获得理论上的可观察性矩阵。通过Gauss-Newton算法执行最小化过程。该方法用于确定经受随机噪声的实验旋转机的基础刚度。

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