Static structures (e.g. – buildings) – Means compensating earth-transmitted force – Relative motion means between a structure and its foundation
Patent
1989-12-04
1991-05-21
Safavi, Michael
Static structures (e.g., buildings)
Means compensating earth-transmitted force
Relative motion means between a structure and its foundation
E04H 902
Patent
active
050164090
ABSTRACT:
The present invention concerns apparatus for restraining vibration of a structure having at least one natural mode of vibration. The apparatus comprises an enclosure, a main weight, a resilient member, a viscous liquid, and an adjustment device. The enclosure defines an inner space therein and the main weight has a mass and is enclosed in the enclosure. The resilient member connects the weight to the enclosure and exerts on the weight, a restoring force proportional to the relative displacement of the weight with respect to the enclosure. The viscous liquid is retained in the inner space and has a viscosity which provides to the weight, a damping force which is proportional to a relative velocity of the weight with respect to the enclosure. The resilience of the resilient member and the mass of the main weight provide the apparatus with at least one natural frequency of vibration. The adjustment device provides the capability of adjusting resilience of the resilient member and/or the mass of the weight, in order to adjust the natural frequency of the apparatus. In order to restrain the vibration of the structure, the apparatus has at least one natural frequency of vibration which corresponds to at least one natural mode of vibration in the structure.
REFERENCES:
patent: 3145012 (1964-08-01), Kfoury
patent: 3392953 (1968-07-01), Ciringione et al.
patent: 4669710 (1987-06-01), Howat
patent: 4700932 (1987-10-01), Katsuno
patent: 4783937 (1988-11-01), Sato
Safavi Michael
Shimizu Construction Co. Ltd.
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