Viscous damper is usually a double piston rod structure. It is generally composed of cylinder block, piston, fluid medium (silicone oil), piston rod and end cap. There are small holes in the piston, which can reciprocate along the axis of the cylinder.

When dynamic loads such as earthquake and strong wind cause sudden structural displacement, the piston of damper moves relative to the cylinder block. The fluid medium flows through the specific holes in the piston to form a damping force. The product's damping effect dissipates the load input capacity in the form of molecular heat energy, thus protecting the structure from damage. When the structure is slowly displaced due to temperature change, the fluid medium can flow from one chamber of the cylinder block to another, requiring that the damping force generated at this time be less than 10% of the rated damping force. The spherical hinge bearing at both ends has its own rotation angle to ensure the consistency of piston, piston rod and cavity during installation.

 

Formula of constitutive relation for viscous damper: F=C*V^a

Among them: F: damping force (kN); C: damping coefficient (kN/(m/s)^ a); V: maximum reaction rate (m/s); a: velocity index