Abstract
This paper focuses on mitigation of dynamic loading induced on off-shore
towers by drifting ice. Conical structures attached to off-shore towers
at water level are widely used to reduce static and dynamic ice
actions. The level of remaining forces is enough to cause severe tower
vibrations, therefore a need for an additional device to reduce the
remaining actions is recognized. Present study introduces a new,
compliant connection between the cone and the tower. Parameters of the
connection are controlled semi-actively to optimize the effect.
Numerical studies are made to roughly estimate the effectiveness of the
new solution. First, contact problem of ice sheet and cone is simulated
using simplified material model for ice. Then a numerical model of a
wind turbine tower is constructed. Dynamic interaction between cone and
tower is simulated and the new solution effectiveness is discussed.
| Original language | English |
|---|---|
| Pages (from-to) | 217-226 |
| Journal | Computers and Structures |
| Volume | 86 |
| Issue number | 3-5 |
| DOIs | |
| Publication status | Published - 2008 |
| MoE publication type | A1 Journal article-refereed |
Keywords
- Impact load mitigation
- Semi-active control
- Conical structures
- Ice loading
- Off-shore wind turbine
- Structural dynamics