Static structures (e.g. – buildings) – Means compensating earth-transmitted force – Relative motion means between a structure and its foundation
Patent
1993-06-15
1994-06-21
Friedman, Carl D.
Static structures (e.g., buildings)
Means compensating earth-transmitted force
Relative motion means between a structure and its foundation
E04B 198
Patent
active
053219236
ABSTRACT:
An antivibration actuator which alleviates vibration applied to a machinery or a building accommodating the machinery to protect the machinery and building from earthquake or other external perturbing vibration. A signal from a sensor disposed on a vibrated body can be inputted thereto through a control device and a waveform opposite to that of a vibration transmitted to the vibrated body is generated in order to reduce the vibration transmitted to the vibrated body. In particular, it is so constructed that it includes a coil member including a holding plate and flat coils disposed on a front and a rear surface of the holding plate and secured to a fixed member disposed independently from the vibrated body; a movable member including a pair yokes and a plurality of permanent magnets disposed on said yokes opposite to the flat coils through magnetic air gaps and magnetized in a thickness direction so that opposite poles appear alternately in a longitudinal direction. The movable member is movable in the longitudinal direction. Further, the movable member is joined with the vibrated body, and the flat coils generate a magnetic field in a direction opposite to that of the magnetic field generated by the permanent magnets by making a control current, based on the signal coming from the sensor, flow therethrough. In this way, a compact antivibration actuator having a simple construction, good response characteristics and high reliability can be obtained.
REFERENCES:
patent: 4635892 (1987-01-01), Baker
patent: 4924640 (1990-05-01), Suizu et al.
Friedman Carl D.
Hitachi Metals Ltd.
Wilkens Kevin D.
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