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World leaders in the field of shock & vibration with over 60 years of industry experience. 

23. SEMI-ACTIVE FLUID VISCOUS DAMPERS FOR SEISMIC RESPONSE CONTROL

The addition of passive damping to a structure greatly increases its earthquake resistance. It is possible to get further increase through an active or semi-active control system for the dampers. Semi-active damping is preferred due to low external power requirements and fail-safe operation. This paper describes the history of the successful use of semi-active fluidic control devices in military applications and how this technology has been adapted to earthquake hazard mitigation. Testing of a semi-active continuously adjustable damping device through fluid orificing is described. Mathematical models of the behavior of the device are also presented.

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