HYBRIDIZATION OF FINITE ELEMENT METHOD WITH EXPERIMENTAL MODAL ANALYSIS AND ITS APPLICATION IN MODELING OF STRUCTURE

摘要

After the characteristics of analytical and experimental method of modeling structure being studied, an improved method resulting from the hybridizing of finite element method (PEM) with experimental modal analysis (EMA), FEMA, is given. FEMA obtains the rough model some parameters of the model are approximately determined while others is undetermined, of the structure by PEM. The undetermined parameters are identified approximately from the experimentally obtained acceleration response of the structure. Based on the initial value of the physical parameters an initial model of the structure is established. A statistical method used to check if the initial model is applicable is given. If the initial model is applicable the mathematical model of structure can be obtained by continuous perturbation modification of the initial model. The advantages of PEMA is demonstrated by computer simulation.