Variable damping device for seismic response controlled structur

Details Variable damping device for seismic response controlled structur Variable damping device for seismic response controlled structur

1992-12-17

1994-05-17

Friedman, Carl D.

Static structures (e.g., buildings)

Means compensating earth-transmitted force

Relative motion means between a structure and its foundation

52 1, E04B 198

Patent

active

053117093

ABSTRACT:
A hydraulic variable damping device for installation in the frame of a structure to control vibrations while evaluating the damping property of the structure during seismic disturbances. Control means for this device include a command value judging circuit for comparing the plus or minus sign of a differential pressure value between hydraulic chambers within the device with that of a generated damping force command value to output a valve opening command value for fully opening a flow regulating valve when the signs of the command value and the differential pressure value are different from each other. A pressure controller is provided for making a correction based on the feedback of the pressure valve when the signs of the damping force command value and the differential pressure value are the same to generate a valve opening command value. A valve controller circuit is provided for making a correction by feeding back a detected valve opening value of the flow regulating valve with respect to the valve opening command value signal received from the command value judging circuit or the pressure controller to generate a valve opening control command value.

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patent: 5147018 (1992-09-01), Kobori et al.
patent: 5233797 (1993-08-01), Uno et al.

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