Kelvin-Voigt Dampers > Stiffness Parameters
Definition or modification of the stiffness parameters of damper springs. These are special elements for modeling a certain damper available on the market. They consist of a spring part (only 1 component in local x-direction) and a damper element arranged in parallel. The spring has 2 different spring constants dependent on the actual displacement value. The damper has the specified damping properties as long as displacement difference and velocity act in the same direction. The damper is not effective when displacement and velocity act in opposite direction.
| Setting | Description |
|---|---|
| From/To/Step | Element series, for which the section properties are input/modified. |
| Element type | Kelvin-Voigt Damper (SDamp): Type name of the element |
| Aero class / EccType | Irrelevant in this context |
| Cx1 (in the element table Cx) | Spring constant for the case that the absolute value of the displacement difference abs(dx) < dx1 (initial spring stiffness) |
| Cx2 (in the element table Cy) | Spring constant for the case that the absolute value of the displacement difference is greater than dx1 (abs(dx) > dx1) |
| dx1 (in the element table CMx) | Limit value of the displacement difference separating the 2 stiffness regions |
| dx2 (in the element table CMy) | not used |
| Alpha (in the element table U) | Exponent for describing an exponential damping law: Fd = sign(vx) * Cvx * [abs(vx)]**Alpha with vx = displacement velocity |
| Cvx (in the element table UIN) | Damping constant |