1. Working Principle
Viscoelastic damper (VED) is made of a series of polymer materials such as propylene compounds, diene compounds, asphalt compounds, styrene compounds, etc., which have the characteristics of strain lagging behind stress. A certain thickness of viscoelastic material is sandwiched between steel plates in the form of laminated rubber, and the viscoelastic material moves back and forth with the restrained steel plates, An effective energy dissipation device that dissipates energy through the shear hysteresis deformation of viscoelastic damping materials.

Figure 1: Structural Diagram of Viscoelastic Damper

2. Product Advantages
Viscoelastic damper (VED) mainly depends on the hysteretic energy dissipation characteristics of viscoelastic materials to increase the damping of the structure and reduce the dynamic response of the structure. Viscoelastic dampers are simple in structure, economical and practical. Generally, they do not change the form of the structure and do not require external energy input to provide control force. They can dissipate energy even under small vibration conditions, and can be used for seismic and wind vibration control of the structure at the same time.

Figure 2: Viscoelastic damper outline drawing

3. Product Application
Viscoelastic dampers (VEDs) are generally located at locations that can produce relative deformation, such as diagonal braces, herringbone braces, beam column joints, lower chords of trusses, or between adjacent buildings. When displacement occurs between structural layers, viscoelastic dampers will produce shear hysteresis deformation, dissipate the input vibration energy, and reduce the vibration response of the structure.
4. Product testing
The product has been tested strictly by the third party, and its performance indicators far exceed the relevant requirements in 6.1 and 7.1 of the Building Energy Dissipation Damper (JG/T209-2012).
The product inspection shall be carried out in strict accordance with Article 8 and Article 9 of Building Energy Dissipation Dampers (JG/T209-2012).
All products are subject to strict self inspection test before delivery.
5. Product Classification and Model Selection
Viscoelastic damper products are divided into plate viscoelastic damper and cylindrical viscoelastic damper
The plate viscoelastic damper is composed of viscoelastic material and constrained plate, and the constrained plate and viscoelastic material layer are both plate shaped.
The cylindrical viscoelastic damper is composed of viscoelastic materials and inner and outer restraining cylinders. The viscoelastic material layer is cylindrical.
The specific identification methods of viscoelastic damper (wall) products are as follows:

Explain:
A: Classification code: plate type, B; Barrel type, T
B: VED-B-200-250 refers to plate viscoelastic damper, with design damping force of 200KN and design value of apparent shear strain of 250%.