| EP2080899A1 | 2009-07-22 |
| CLAIMS. 0. Security device fitted on vertically floating and rotating pillars or poles anchored to the bottom of oceanic or lake environments. 1. Security device fitted on the rotating pillars or poles of building constructions placed in oceanic or lake environments, THE NOVELTY OF WHICH BEING that each individual vertically rotating pillar or pole is encircled by a security spiral or helix, where the length between the turns of the spiral measured along the length axis of the pillar or pole is less than 2,5 times the outer diameter of the pillar or pole. 2. Security device fitted on the rotating pillars or poles of building constructions placed in oceanic or lake environments in accordance with claim No. 1, THE NOVELTY OF WHICH BEING that each individual vertically rotating pillar or pole is encircled by multiple-thread and unbroken security spirals or helixes, such as e.g. two security spirals per rotating pillar or pole. 3. Security device fitted on the rotating pillars or poles of building constructions placed in oceanic or lake environments in accordance with claims Nos. 1 and 2, THE NOVELTY OF WHICH BEING that the security spirals along or on a rotating pillar or pole have an either increasing or decreasing pitch along the rotating pillar or pole, so that the distance between each turn on the actual pillar or pole is increasing or decreasing. 4. Security device fitted on the rotating pillars or poles of building constructions placed in oceanic or lake environments in accordance with claims Nos. 1, 2 and 3, THE NOVELTY OF WHICH BEING that the outer diameter of the security spirals may be gradually increased and/or decreased in relation to the inner diameter. |
System for redusing the magnus effect on vertical, floating, rotating, bottom anchored offshore piles/poles.
Security device on vertically floating and rotating pillars or poles anchored to the bottom in oceanic or lake environments.
USAGE OF THE INNOVATION.
The innovation consists of a security device fitted on rotating bottom pillars or poles placed in oceanic or lake environments where the device consists of a rotating pillar/pole together with a security spiral/helix with a pitch of max. 2,5 times the diameter of the pillar/pole. This means that the length between the turns of the spiral, measured along the axis of the pillar/pole, is max. 2,5 times the diameter of the pillar/pole.
KNOWN TECHNIQUE.
There is no known technique.
THE TECHNICAL PROBLEM TO BE SOLVED.
The purpose of the innovation is to obtain a security device which reduces the Magnus Effect. THE NEW TECHNIQUE.
Security spirals around a rotating pillar/pole in a flowing oceanic or lake environment will change the direction of the current at the surface of the pillar/pole in such a way that the flow of the water follows both the upward and the downward pitch of the spiral, thereby reducing the Magnus Effect in correspondance with the change of pitch in relation to the length axis, whereby the Magnus Effect becomes a function of both the pitch and the speed of the water flow, which is why the reduction of the Magnus Effect can be adjusted by changing the pitch, and this is a technical novelty.
LIST OF FIGURES.
In the following, the innovation is explained in detail with reference to the drawing, where:
Fig. 1 shows a schematic sideview of a pillar/pole with a double spiral formed by the elements I and II, placed in an oceanic or lake environment and rotating around own axis A in the direction C with a water current in the direction indicated by arrow B.
It is known that the load from the wind pressure on a building construction fitted with a double spiral with a pitch less than 2,5 times the diameter of the building construction is reduced compared to an identical construction without a double spiral.
Fig. 2 schematically shows, in cross section, the meeting between the water current B and the same pillar/pole and its double spiral, indicating the split of the water current both ways around the pillar/pole with the two spiral elements I and II, which - depending on the pitch - lead the water current between the spiral elements more or less transversely to the length axis A, whereby the Magnus Effect is correspondingly more or less reduced.
The direction of the rotation C has no influence on the variation of the Magnus Effect due to the presence of a double spiral, but obviously on the direction of the Magnus Effect.