초록 ▼

A variable frequency vibration controller includes a cantilever beam supported from the vibration prone structure whose vibrations are to be controlled. The cantilever beam has selectively shaped hollow interior portions into which fluid can be selectively injected or withdrawn to vary the total mas

A variable frequency vibration controller includes a cantilever beam supported from the vibration prone structure whose vibrations are to be controlled. The cantilever beam has selectively shaped hollow interior portions into which fluid can be selectively injected or withdrawn to vary the total mass of the cantilever beam. The cantilever beam natural frequency is thus tuned to match or selectively mismatch the frequency at which the vibration prone structure is vibrating. Thereby, the beam is used to optimally absorb or excite the vibrations of the structure.

대표청구항 ▼

A multi-frequency vibration controller comprising: a vibration prone structure, a cantilever beam of selected natural frequency connected to the vibration prone structure so as to vibrate therewith and having a hollow port into which fluid may be added or withdrawn to vary the cantilever beam total

A multi-frequency vibration controller comprising: a vibration prone structure, a cantilever beam of selected natural frequency connected to the vibration prone structure so as to vibrate therewith and having a hollow port into which fluid may be added or withdrawn to vary the cantilever beam total mass and natural frequency, means operatively connected to the vibration prone structure to continuously determine the present vibrating frequency of the vibration prone structure and to generate a first signal representative thereof, means responsive to said first signal and operable to determine the optimum total mass of the cantilever beam required to cause the cantilever beam natural frequency equal to or selectively unequal to the frequency of the present vibrations of the vibration prone structure so determined, and to generate a second signal representative thereof, and means responseve to said second signal and operable to selectively introduce or withdraw fluid to or from the hollow portion of the cantilever beam to produce said optimum cantilever beam total mass and hence natural frequency to be equal to or selectively unequal to the frequency of the present vibrations of the vibration prone structure to thereby control the vibrations of the vibration prone structure.