Robust parameter identification using forced responses

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• 作者：R. Pascual ; R. Schä ; lchli ; M. Razeto
• 关键词：Model updating ; Forced response ; Structural dynamics
• 刊名：Mechanical Systems and Signal Processing
• 出版年：2007
• 出版时间：February 2007
• 年：2007
• 卷：21
• 期：2
• 页码：1008-1025
• 全文大小：448 K

文摘

In this paper, a new model updating scheme is introduced to adjust the system matrices of a finite-element model by using experimental operating deflection shapes (ODS). An ODS is defined here as the response vector when the system is driven at a given degree of freedom with a unit force of fixed frequency. The proposed algorithm adjusts the numerical model in an iterative way. The matrix equilibrium equation is solved by first taking into account the frequency shift that appears between the non-updated finite element model and the experimental structure. In this way, numerical instabilities observed in state-of-the-art methods are avoided. We present results on two well-known numerical and experimental benchmark cases. They show the good convergence properties of the proposed approach.