VIBRATION CONTROL OF SHALLOW SHELL STRUCTURES USING A SHELL-TYPE DYNAMIC VIBRATION ABSORBER

In this study, a new shell-type dynamic vibration absorber is presente d for suppressing several modes of vibration of the shallow shell (mai n shell) under harmonic load. It consists of a shallow shell (the dyna mic absorbing shell), under the same boundary condition and with the s ame shape as those of the main shell, with connecting springs and damp ers in the vertical direction between the main and dynamic absorbing s hells. Formulae for an approximate tuning method for the shell-type dy namic absorber are also presented using the optimum tuning method for a dynamic absorber in the two-degree-of-freedom system, obtained by th e Den Hartog method. Subsequently, numerical calculations are presente d which demonstrate the usefulness of the shell-type dynamic vibration absorbers. (C) 1998 Academic Press.