Investigation of dynamic characteristics of an elastic wing model by using corrections of mass and stiffness matrices

Abstract

The effects of theoretical changes in mass and stiffness matrices on the dynamic characteristics of a model wing are considered. The NASTRAN computer code is utilized to find theoretical mass and stiffness matrices with their corresponding natural frequencies and mode shapes. The dynamic response is then calculated by using theoretical mass and stiffness matrices and theoretical modal data. Experimentally measured mode shapes and natural frequencies are used to improve the stiffness and mass matrices. The resulting improved stiffness and mass matrices are further used to calculate again the dynamic response for the model. Analysis of the computational results and experimental data show that the improved theoretical model represents the experimental model better than the original theoretical model. Other means of improving the theoretical model are summarized.