Decomposition of Intrinsic Mode Functions at DIC Key Measurement Points

Digital Image Correlation (DIC) which is used as displacement and strain measurements has advantages of full field, non-contact and considerately high precision. Therefore, DIC has great potentiality in quantitative measurement of deformation and vibration of engineering structure. In the most cases, the vibration signal measured on structure under service condition is nonlinear and non-stationary. As the prior numerical proceeding works of hybrid method of DIC and FEA, an Empirical Mode Decomposition method (EMD) is presented in this paper to obtain the Intrinsic Mode Functions (IMFs) of the vibration signal at structural key points. The EMD method can be also used to de-noise the quasi-static deformation or strain signal measured by DIC at structural key points.