Rotatable Flow-Guide Columns for Offshore Platform Stability
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Solution Overview
Problem
Floating offshore platforms face challenges with dynamic stability due to complex interactions with winds, waves, and sea currents, leading to increased hydrodynamic performance changes and vortex-induced vibrations, which compromise their structural integrity and efficiency.
Innovation Solution
A flow-guide device comprising a rotatable flow-guide column base, ballast level control, and a spiral side belt system to adjust wave incidence and lower the center of gravity, while restraining vortex-induced vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the platform uses conventional fixed structure, then the structure is simple and easy to manufacture, but the dynamic stability under wave action deteriorates
Solution Approach 1:
The patent applies the dynamics principle by making the flow-guide column rotatable relative to the platform body, allowing it to dynamically adjust its orientation according to wave direction. The rotating mechanism includes a rotation joint connecting the flow-guide column to the platform, enabling the column to change its angle of incidence with waves, thereby improving dynamic stability while maintaining a relatively simple overall structure.
2Reliability
If the angle of incidence of waves increases, then the lateral force increases, but the hydrodynamic performance deteriorates
Solution Approach 1:
The rotatable flow-guide column dynamically adjusts its orientation to maintain an optimal angle of incidence with incoming waves. By rotating the column to face the wave direction, the system minimizes lateral forces and maintains favorable hydrodynamic performance characteristics, preventing excessive lateral loading on the platform structure.
Solution Approach 2:
The patent changes the angular parameter of the flow-guide column relative to the wave direction. By adjusting the column's orientation angle through the rotation mechanism, the system optimizes the angle of incidence to minimize lateral forces and maintain optimal hydrodynamic performance under varying sea conditions.
3Length of moving object
If the platform draft is increased for deep sea operation, then the operational depth increases, but vortex-induced vibrations increase
Solution Approach 1:
The patent employs a spiral side belt wrapping around the flow-guide column, creating a flexible protective structure that disrupts vortex formation. This spiral belt acts as a flow control element that prevents large-scale vortex-induced vibrations while allowing the platform to maintain deep draft for operational depth requirements.
Solution Approach 2:
The spiral side belt serves as an intermediary element between the flow-guide column and the surrounding water. It modifies the flow patterns around the column, preventing direct vortex-induced vibrations from affecting the platform structure while allowing the deep draft configuration to maintain operational capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves hydrodynamic performance by ensuring waves flow forward, reducing lateral forces, and stabilizing the platform by controlling the center of gravity and suppressing vortex-induced vibrations.
Implementation Method 1
The flow-guide column base can rotate separately or drive the offshore platform to rotate synchronously according to the direction of waves to ensure that the waves flow in forward
Implementation Method 2
a ballast compartment is arranged in the flow-guide column base, and the ballast level control device is used for controlling a ballast level in the ballast compartment
Implementation Method 3
can also lower the center of gravity of a platform
Implementation Method 4
the spiral side belt system is arranged outside the flow-guide column base and used for restraining vortex-induced resonance
Data Source
AI summary
Disclosed is a flow-guide device for an offshore platform, comprising a flow-guide column base, a ballast level control device and a spiral side belt system, wherein the flow-guide column base is located at the bottom of an offshore platform, and multiple flow-guide column bases are arranged symmetrically and distributed in a ring array; the flow-guide column base is rotatably connected to the offshore platform; a ballast compartment is arranged in the flow-guide column base, and the ballast level control device is used for controlling a ballast level in the ballast compartment; and the spiral side belt system is arranged outside the flow-guide column base and used for restraining vortex-induced resonance. The flow-guide column base and the offshore platform can be kept in a relatively fixed state by means of a clamping device, such that the offshore platform is able to rotate synchronously with the flow-guide column base.