Static structures (e.g. – buildings) – Means compensating earth-transmitted force – Dynamic force generator
Patent
1993-02-11
1995-05-02
Safavi, Michael
Static structures (e.g., buildings)
Means compensating earth-transmitted force
Dynamic force generator
521671, F04B 198
Patent
active
054108454
ABSTRACT:
A vibration control device of an active type for a structure comprising a first additional mass body movable relative to the structure; spring means for giving a period to the additional mass body which synchronizes with the natural period of the structure; a second additional mass body supported by and movable relative to the first additional mass body; and drive means for applying a control force between the first and second additional mass bodies in response to a sensed vibrations of an earthquake or the like. Laminated rubber support provides main spring means for synchronizing with the assumed natural period of the structure. Auxiliary spring means, such as laminated rubber or coil springs, is separately provided for fine tuning the period of the device. The responses from the structure are reduced by adjusting the difference between the assumed and actual natural periods of the structure by use of the auxiliary spring means and by providing the control force from the drive means.
REFERENCES:
patent: 4593501 (1986-06-01), Delfosse
patent: 4783937 (1988-11-01), Sato
patent: 4922671 (1990-05-01), Sato
patent: 4924640 (1990-05-01), Suizu et al.
Japanese Abstract No. JP 3249443, Nov. 7, 1991.
Japanese Abstract No. JP 3250165, Nov. 7, 1991.
Japanese Abstract No. JP 63297837, Dec. 5, 1988.
Japanese Abstract No. JP 4001375, Jan. 6, 1992.
Koshika Norihide
Nishimura Isao
Orui Satoshi
Sakamoto Mitsuo
Sasaki Katsuyasu
Kajima Corporation
Safavi Michael
Tilberry James H.
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