Frequency design of dynamic vibration absorbers for flutter suppression of a sandwich panel

A novel scheme for panel flutter suppression was proposed here. In this scheme the panel was designed as a sandwich panel incorporated with distributed micro beam-type dynamic absorbers acting as its core layer. To improve this scheme, the frequency design method for a dynamic absorber was investigated in the present study. Based on the mode-coupling mechanism of panel flutter, the frequency design of dynamic absorber was performed according to a single-frequency design scheme and a double-frequency design scheme, respectively. Numerical simulation results showed that when all the micro dynamic absorbers were designed with the single-frequency design scheme, a maximum flutter speed for the sandwich panel could be achieved at the optimal absorber frequency, which was different from the flutter frequency or the natural modal frequencies of the original sandwich panel; and when the micro dynamic absorbers were designed with the double-frequency design scheme, a maximum flutter speed of the sandwich panel was much bigger than that obtained using the single-frequency design scheme.