최적 진동흡수계에 의한 구조물의 진동조절 ( Structural Control by Optimal Vibration Absorbing System )

Dynamic vibration absorbers with one degree of freedom are generally applied to the passive control of structural vibration. These absorbers are useful to control a single mode of vibration under harmonic excitation. In this paper, substructure-type dynamic vibration absorber consisting of dynamic absorbing structure and connecting spring and damper between the main structure and substructure is presented. Equations of motion of the system become equal to those of the two-degrees-of freedom system with two masses and three springs. Formulas for optimum design of the substructure-type dynamic vibration absorber are proposed by using the optimum design method of a dynamic absorber in two degrees of freedom, obtained by Den Hartog's method. Numerical calculations indicate the response of the main structure with optimal vibration absorbing system is considerably reduced.