Method and apparatus for active control of flexible structures

Details Method and apparatus for active control of flexible structures Method and apparatus for active control of flexible structures

1980-12-24

1984-02-07

Murtagh, John E.

Static structures (e.g., buildings)

Controlled by condition responsive means

52167, 52741, 248638, F16M 1300, E04H 902

Patent

active

044294964

ABSTRACT:
A method and apparatus for active control of flexible structures subjected to shocks such as earthquake ground motion. In a first embodiment, the deflection of the structure beyond a prescribed threshold triggers a corrective pulse of mechanical energy which is applied within one period of the structure's lowest mode of vibration. The pulse serves to disorganize the buildup of harmonic motion. In a second embodiment, a pulse, calculated at each deflection cross-over point (during vibration), is applied to the structure in a direction opposite to that of its instantaneous velocity to effect active damping of the motion.

REFERENCES:
patent: 3973078 (1976-08-01), Wolf
patent: 4328941 (1982-05-01), Phillips
Architectural Record, Jun. 1978, pp. 114-116.

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