Finite Element Model Updating of an Assembled Aero-Engine Casing
In this paper, the finite element model updating technique based on first-order optimization is investigated and applied to a jointed aero engine casing. Vibration modal testing is conducted and modal data, i.e. natural frequencies and mode shapes, are obtained to update the FE models of two aero engine casings and their jointed structure. A two-step strategy is proposed in the updating process. In the first step, model updating is carried out on the two single casings separately in order to validate the casing component models. In the second step, the assembled casing is updated with emphasis on updating joint parameters. The joints are modeled using a layer of continuous solid elements that have material properties to be adjusted. The final updated FE model for the aero-engine casing is able to predict natural frequencies and mode shapes close to the measured ones.
KeywordsModel updating Finite element modelling Modal test Sensitivity analysis Jointed casing
The financial support of the National Natural Science Foundation of China (Project No. 51175244)C Research Fund for the Doctoral Program of Higher Education of China (Project No. 20093218110008) and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) are gratefully acknowledged. SC Ma also acknowledges the support of Fundamental Research Fundsfor the Central Universities of China (Project No. kfjj20110204).
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