Studies of mistunign effects on nearly cyclic systems have left one puzzling question unanswered. A free response analyssi indicates that mistunign effects on the mode shapes increase monotonically as the coupling between the subsystems of the assembly is decreased, witht he mode shapes becoming increasingly localized. Hence, very weakly coupled systems experience the most dramatic mistuning effects. Forced response analysis produces evidence to the contrary, namely that there is some threshold value of coupling that leads to maximum mistuning effects,a nd that these effects are even more dramatic than those that might be predicted by the free response analysis. This would indicate that there is a second, unknown, mechanism at play that enhances the well known mode localization phenomenon in the forced response case. In this paper a search for this unknwon mechanism is conducted, and some answers are proposed.
展开▼
