Fluid - Import export

Spring fluid viscous dampers are cylinder/piston assemblies characterized by a constitutive bond in which reaction force F depends both on speed v and on displacement x, according to law F=F0+Kx+Cvα, where F0 is pre-load force (if any), K is stiffness, C is the damping constant and α=0.15. Pre-load force can be useful to avoid displacements for horizontal service actions. Experimental hysteretic cycles of a spring fluid viscous damper without pre-load force. Spring fluid viscous dampers for the Badia Nuova flyover on highway A1. Spring fluid viscous dampers installed in Rio Higuamo Bridge (Dominican Republic).

The OP and OTP series fluid viscous dampers are cylinder/piston assemblies in which the lamination of a silicone fluid through an appropriate hydraulic circuit permits the dissipation of energy. The OTP series, unlike the OP series, permits thermal expansions without remarkable resistance. The typical resulting force-speed constitutive bond is not linear, i.e. F=Cvα, where F is force, C is the damping constant, v is speed, and α=0.15. Force-displacement cycles of a fluid viscous damper in an imposed displacement test with sinusoidal signal. Tests at FIP INDUSTRIALE laboratory on a fluid viscous dampers at Rion-Antirion Bridge (Greece). Fluid viscous dampers installed in the tuned mass damper at the skyscraper Taipei 101 (Taiwan).