A modal coupling procedure to improve residual modal effects based on experimentally generated data

In this paper a modal coupling procedure is developed to improve residual modal effects based on experimentally generated data. While showing that Craig–Chang's proposed approximation function for higher frequency modes does not compare well with the exact function, a new procedure is developed in order to re-express the dynamic residuals. For this purpose, all frequency dependent terms of the Maclaurin series in Craig–Chang's proposed method are replaced by a general compatible function, which includes the neglected higher order terms. However, this function no longer appears in final equation of motion. Results from case studies for the discrete, continuous and experimental models are presented to verify the procedure and to show the capabilities of the proposed method.

► We develop a modal coupling procedure to improve residual modal effects.
► We replace all frequency dependent terms by a general compatible function.
► We examine the presented modified method using experimentally generated data.
► In higher-frequency modes region, the proposed method leads to enhanced results.