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An apparatus for supporting a vibration body such as a power unit of an automotive vehicle in which an orifice in a partitioning member for communicating two fluid chambers whose cross sectional area is varied to change a resonant frequency of the apparatus so that a plurality of vibrations can effe

An apparatus for supporting a vibration body such as a power unit of an automotive vehicle in which an orifice in a partitioning member for communicating two fluid chambers whose cross sectional area is varied to change a resonant frequency of the apparatus so that a plurality of vibrations can effectively be reduced with effective uses of a vibration prevention function provided by the reduction of a dynamic spring constant of a fluid dynamic damper and of a damping function provided by a fluid dynamic damper action.

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An apparatus comprising: (a) first means for forming a fluid dynamic damper so as to damp a particular frequency vibration in a vibrating object; and (b) second means for changing an orifice cross section in order to alter a fluid equivalent mass of the fluid dynamic damper so as to prevent a transm

An apparatus comprising: (a) first means for forming a fluid dynamic damper so as to damp a particular frequency vibration in a vibrating object; and (b) second means for changing an orifice cross section in order to alter a fluid equivalent mass of the fluid dynamic damper so as to prevent a transmission of another particular frequency vibration in the vibrating object, wherein said first particular frequency vibration damped by said first means is expressed as: F=½pK/M, wherein K denotes the fluid dynamic constant, denotes the fluid equivalent mass, and F denotes said first particular frequency which is varied to a frequency including said second particular frequency.