초록 ▼

An apparatus has a mass suspended between two mounting plates by a separate springs to form a resonant structure that absorbs vibration in a structural member to which the mounting plates are attached. Permanent magnets are fixed to opposite sides of the mass. A sensor produces a signal indicating t

An apparatus has a mass suspended between two mounting plates by a separate springs to form a resonant structure that absorbs vibration in a structural member to which the mounting plates are attached. Permanent magnets are fixed to opposite sides of the mass. A sensor produces a signal indicating the frequency of the vibration. A feedback circuit receives the signal from the sensor and produces an output signal having first component frequency which corresponds to a harmonic of the frequency of the vibration. The output signal is applied to a separate voice coil adjacent to each permanent magnet. The magnetic fields produced by the output signal flowing through the voice coils interact with the magnetic fields from the permanent magnets to generate forces that act on the mass in a manner that increases the impedance of the absorber to the vibration in the structural member.

대표청구항 ▼

[ We claim:] [1.] A vibration absorber, for a body in which a vibrational disturbance occurs at a given frequency, said vibration absorber comprising:a mechanical resonator having a member for attachment to the body, a mass, and a spring connecting the mass to the member, wherein said mechanical res

[ We claim:] [1.] A vibration absorber, for a body in which a vibrational disturbance occurs at a given frequency, said vibration absorber comprising:a mechanical resonator having a member for attachment to the body, a mass, and a spring connecting the mass to the member, wherein said mechanical resonator resonates at substantially the given frequency to counteract the vibrational disturbance in the body;a magnet attached to the mass and producing a first magnetic field;a sensor which produces a sensor signal indicating vibration due to the vibrational disturbance;a feedback circuit connected to the sensor to receive the sensor signal and produce an output signal having first component frequency substantially equal to a harmonic of the given frequency; anda conductor connected to the feedback circuit to carry the output signal and being mounted adjacent to one side of said mass so that a magnetic field produced by the output signal flowing through the conductor interacts with the magnetic field from the magnet to generate a force that acts on said mass thereby increasing an impedance of the vibration absorber to the vibrational disturbance.