On Updating of Finite Element Model Using Optimization Method
| Autor: | Wolfgang G. Luber |
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| Rok vydání: | 1997 |
| Předmět: | |
| Zdroj: | Volume 1B: 16th Biennial Conference on Mechanical Vibration and Noise. |
| DOI: | 10.1115/detc97/vib-4149 |
| Popis: | An error localization and update method is presented which examines the elastic and dynamic behavior of the structure by means of deflections stemming from a discrete load case and from normal mode shapes of the structure respectively as well as the information of the change of natural frequencies. The main objective of the study is to provide an economical and reliable error localization method for aeronautical structures. A finite element model of the elastic structure must be available before testing the real structure to determine the optimal positioning of sensors. The error localization is based on sensitivity methods and on nonlinear mathematical optimization codes. Displacements for selected load cases and normal modes are taken as constraints. Minimum sizing changes with respect to the initial structure is used as objective function. Numerical examples with different structures show that the proposed methods can accurately detect the variations in stiffness in certain cases. |
| Databáze: | OpenAIRE |
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