Mixed Semi-Submersible Platform for Wind Turbine Load Distribution
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Solution Overview
Problem
Current semi-submersible concrete platforms for offshore wind turbines face challenges in construction complexity, weight distribution, and structural fatigue due to increased turbine sizes, making them unfeasible and uncompetitive compared to metal platforms.
Innovation Solution
A semi-submersible platform with a mixed structure comprising a concrete caisson-type structure for hydrodynamic stability and flotation, and a steel transition piece for load distribution, allowing for easier construction and reduced weight, using a design that can be built in floating docks and minimizing the need for large land areas and lifting means.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If concrete semi-submersible platforms are used for offshore wind turbines, then structural stability and fatigue resistance are improved, but construction complexity and manufacturing difficulty increase significantly
Solution Approach 1:
The platform is divided into separate modular units (floating units with cylindrical bodies and a base plate) that can be manufactured independently and assembled together at sea, reducing construction complexity while maintaining structural integrity
Solution Approach 2:
A steel transition piece is introduced as an intermediary element between the concrete caisson structure and the wind turbine tower, simplifying the connection nodes and distributing loads effectively without requiring complex direct concrete-to-tower connections
2Strength
If concrete platforms are manufactured on land, then structural integrity is improved, but moving and launching operations become extremely complex and require special means
Solution Approach 1:
The platform is segmented into multiple floating units that can be manufactured on land with standard facilities and then assembled in floating docks, avoiding the need for specialized heavy-lifting infrastructure while maintaining structural integrity through standardized connection systems
Solution Approach 2:
The manufacturing process transitions from entirely land-based to a combination of land-based unit fabrication and sea-based assembly, utilizing the third dimension (water) for the final assembly and launching operations, thereby avoiding the constraints of land-based heavy lifting
3Force
If connection nodes between tower and concrete platform are designed for high loads, then turbine support capability is improved, but fatigue-related cracks and structural performance degradation increase
Solution Approach 1:
The steel transition piece serves as a mediator between the concrete platform and the wind turbine tower, absorbing and distributing dynamic loads and fatigue stresses, thereby protecting the concrete structure from crack initiation while maintaining high load capacity
Solution Approach 2:
The connection system utilizes a composite approach combining concrete caissons for buoyancy and stability with steel transition pieces for dynamic load resistance, leveraging the complementary properties of both materials to achieve both high strength and fatigue resistance
4Power
If turbine sizes are increased for economy of scale, then energy production efficiency is improved, but platform dimensions and construction constraints are worsened
Solution Approach 1:
The platform uses multiple standardized floating units that can be scaled by adding or removing modules, allowing the structure to adapt to different turbine sizes without requiring completely new designs, thereby supporting larger turbines while maintaining construction feasibility
Solution Approach 2:
The modular floating unit design creates a universal platform configuration that can accommodate various turbine sizes and power ratings by simply adjusting the number and arrangement of modules, providing scalability from smaller to larger turbines without increasing construction complexity proportionally
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
The design facilitates construction, reduces weight and material volume, simplifies connection nodes, and optimizes hydrodynamic performance, making it feasible for larger turbines while maintaining structural integrity and reducing manufacturing costs.
Implementation Method 1
a first concrete caisson-type structure (1), which serves as hydrodynamic stability and flotation of the platform
Data Source
AI summary
A semi-submersible platform for supporting wind turbines comprising a mixed structure with two portions: a first concrete caisson-type structure, which serves as hydrodynamic stability and flotation of the platform, consisting of: a hollow, closed base plate, and cylindrical and/or frustoconical-shaped bodies, the bases of which are embedded in the base plate, in areas close to the vertices thereof, which are closed at the top by covers; and, a second structure formed by a transition piece that connects the base plate to the lower end of the tower of the wind turbine at connection points, located on each side of the base plate, distributing the service loads of the wind turbine towards the concrete caisson-type structure.