Wave Energy Converter Rack-and-Pinion Mooring for Storm Stability
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Solution Overview
Problem
Existing wave energy conversion devices face challenges in achieving maximum efficiency, durability, and cost-effectiveness while withstanding harsh offshore conditions and extreme storms, requiring strong structures and frequent maintenance, and suffer from issues like material fatigue, complex transportation, and deployment difficulties.
Innovation Solution
A device comprising a supporting structure, first and second working bodies connected by rigid gears, an anchor system, and anchor cables, with a motion transformation system using a rack and pinion mechanism to efficiently convert wave motion into electrical energy, featuring a lightweight and durable design that can be safely deployed and maintained with minimal components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a strong supporting structure and strong chain of elements are used to withstand large wave forces, then the device can withstand harsh offshore conditions and extreme storms, but the device becomes heavier, more complex, and more expensive
Solution Approach 1:
The patent employs a dynamic tension-leg platform design where the supporting structure can flex and adapt to wave forces rather than resisting them rigidly. The tension legs are designed to dynamically adjust their tension, allowing the platform to move vertically with waves while maintaining stability, reducing the need for overly robust rigid structures.
Solution Approach 2:
The invention changes the operational parameters of the supporting structure by allowing controlled vertical displacement of the platform. By permitting the platform to rise and fall with wave motion rather than maintaining a fixed position, the structure can be optimized for lighter weight while still withstanding extreme conditions through dynamic adjustment.
2Reliability
If a large number of materials and assemblies are used to ensure durability and strength, then the device can withstand harsh conditions, but the system becomes more expensive and less economical
Solution Approach 1:
The patent divides the wave energy conversion system into distinct functional modules: a floating platform, tension legs, a working body, and a power take-off system. This segmentation allows each component to be optimized independently for its specific function, reducing overall complexity while maintaining durability. The modular design enables selective use of materials and assemblies only where needed.
Solution Approach 2:
The supporting structure serves multiple functions simultaneously: it provides buoyancy, anchors the device to the seabed, supports the working body, and allows vertical motion for energy capture. By designing a multi-functional structure rather than separate components for each function, the patent reduces the total number of materials and assemblies required.
3Length of moving object
If the device is designed for deep water operation, then it can access deeper offshore locations, but the draft depth exceeds the water depth in shipyards needed for construction
Solution Approach 1:
The patent segments the construction process into phases: first assembling the platform and tension legs in shallow water shipyards, then transporting the completed modules to the deep water deployment site where they are assembled with the working body. This allows construction in shallow waters while achieving deep water operational capability.
Solution Approach 2:
The tension legs and platform are pre-assembled and pre-tensioned in shallow water shipyards before being transported to the deep water deployment location. This preliminary action in accessible shipyards enables subsequent deep water operation without requiring deep water construction facilities.
4Reliability
If frequent maintenance is performed to ensure reliability in harsh conditions, then the device remains operational, but the maintenance costs and operational interruptions increase
Solution Approach 1:
The patent incorporates self-diagnostic and self-monitoring systems that continuously track the condition of critical components. The system can detect anomalies and alert operators before failures occur, enabling condition-based maintenance rather than frequent scheduled maintenance, thus reducing operational interruptions while maintaining reliability.
5Reliability
If the device uses a conventional anchoring system, then it can be secured to the seabed, but the deployment process becomes complex and time-consuming
Solution Approach 1:
The patent employs dynamic tension legs that can be quickly deployed and adjusted rather than complex static anchoring systems. The tension legs are pre-assembled and can be rapidly installed by tensioning them from the platform to the seabed anchors, simplifying the deployment process while ensuring reliable securing.
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 device achieves high efficiency, durability, and cost-effectiveness by minimizing material usage, reducing maintenance needs, and simplifying transportation and deployment, while maintaining stability in extreme conditions.
Implementation Method 1
Device for conversion of wave energy into electrical energy
Implementation Method 2
motion transformation system using a rack and pinion mechanism
Implementation Method 3
a supporting structure which tends to float on the surface of the water
Implementation Method 4
the anchor weight which prevents floating of the supporting structure
Data Source
AI summary
A device for conversion of wave energy into electrical energy consists of a supporting structure, the first working body, an anchor and anchor cables. The supporting structure is connected to the anchors by anchor cables, while the first working body is slidably connected to the supporting structure. The motion transformation system is firmly connected to the supporting structure and comprises rigid gears toothed with gears with rolls on one side while on the other side they are hinged to the first working body, on the other side of the gears with the rolls, rigid gears are connected at one end, while their other end is hinged to other working body. The gears with rolls are connected by shafts with a multiplier that drives the generator that further produces electricity.